In situ thermal processing of a hydrocarbon containing formation using pressure and/or temperature control

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from at least the portion to a selected section of the formation substantially by conduction of heat;
• pyrolyzing at least some hydrocarbons within the selected section of the formation;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• heating the selected section such that a thermal conductivity of at least a portion of the selected section is greater than about 0.5 W/(m °C.).

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected section of the formation is less than about 370° C. such that production of a substantial amount of hydrocarbons having carbon numbers greater than 25 is inhibited;
• controlling a pressure within at least a majority of the selected section of the formation, wherein the controlled pressure is at least 2.0 bar;
• and
• producing a mixture from the formation, wherein about 0.1% by weight of the produced mixture to about 15% by weight of the produced mixture are olefins, and wherein an average carbon number of the produced mixture ranges from 1-25.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• controlling a pressure within at least a majority of the selected section of the formation, wherein the controlled pressure is at least about 2.0 bar absolute;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• controlling a pressure within at least a majority of the selected section of the formation, wherein the controlled pressure is at least about 2.0 bar absolute;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected section of the formation is less than about 375° C.;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• producing a mixture from the formation, wherein at least a portion of the mixture is produced during the pyrolysis and the mixture moves through the formation in a vapor phase;
• and
• maintaining a pressure within at least a majority of the selected section above about 2.0 bar absolute.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• maintaining a pressure within at least a majority of the selected section of the formation above 2.0 bar absolute;
• and
• producing a mixture from the formation, wherein the produced mixture comprises condensable hydrocarbons having an API gravity higher than an API gravity of condensable hydrocarbons in a mixture producible from the formation at the same temperature and at atmospheric pressure.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• maintaining a pressure within at least a majority of the selected section of the formation to above 2.0 bar absolute;
• and
• producing a fluid from the formation, wherein condensable hydrocarbons within the fluid comprise an atomic hydrogen to atomic carbon ratio of greater than about 1.75.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• maintaining a pressure within at least a majority of the selected section of the formation to above 2.0 bar absolute;
• and
• producing a mixture from the formation, wherein the produced mixture comprises a higher amount of non-condensable components as compared to non-condensable components producible from the formation under the same temperature conditions and at atmospheric pressure.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that superimposed heat from the one or more heat sources pyrolyzes at least about 20% by weight of hydrocarbons within the selected section of the formation;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that superimposed heat from the one or more heat sources pyrolyzes at least about 20% of hydrocarbons within the selected section of the formation;
• and
• producing a mixture from the formation, wherein the mixture comprises a condensable component having an API gravity of at least about 25°.

A method of treating a layer of a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the layer, wherein the one or more heat sources are positioned proximate an edge of the layer;
• allowing the heat to transfer from the one or more heat sources to a selected section of the layer such that superimposed heat from the one or more heat sources pyrolyzes at least some hydrocarbons within the selected section of the formation;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• controlling a pressure and a temperature within at least a majority of the selected section of the formation, wherein the pressure is controlled as a function of temperature, or the temperature is controlled as a function of pressure;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation to raise an average temperature within the selected section to, or above, a temperature that will pyrolyze hydrocarbons within the selected section;
• producing a mixture from the formation;
• and
• controlling API gravity of the produced mixture to be greater than about 25 degrees API by controlling average pressure and average temperature in the selected section such that the average pressure in the selected section is greater than the pressure (p) set forth in the following equation for an assessed average temperature (T) in the selected section:
• p=e[−44000/T+67]
• where p is measured in psia and T is measured in ° Kelvin.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat to at least a portion of a hydrocarbon containing formation such that a temperature (T) in a substantial part of the heated portion exceeds 270° C. and hydrocarbons are pyrolyzed within the heated portion of the formation;
• controlling a pressure (p) within at least a substantial part of the heated portion of the formation;
• wherein
• pbar>e[(−A/T)+B−26744],
• wherein p is the pressure in bar absolute and T is the temperature in degrees K, and A and B are parameters that are larger than 10 and are selected in relation to the characteristics and composition of the hydrocarbon containing formation and on the required olefin content and carbon number of the pyrolyzed hydrocarbon fluids;
• and
• producing pyrolyzed hydrocarbon fluids from the heated portion of the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation to raise an average temperature within the selected section to, or above, a temperature that will pyrolyze hydrocarbons within the selected section;
• producing a mixture from the formation;
• and
• controlling a weight percentage of olefins of the produced mixture to be less than about 20% by weight by controlling average pressure and average temperature in the selected section such that the average pressure in the selected section is greater than the pressure (p) set forth in the following equation for an assessed average temperature (T) in the selected section:
• p=e[−57000/T+83]
• where p is measured in psia and T is measured in °Kelvin.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation to raise an average temperature within the selected section to, or above, a temperature that will pyrolyze hydrocarbons within the selected section;
• producing a mixture from the formation;
• and
• controlling hydrocarbons having carbon numbers greater than 25 of the produced mixture to be less than about 25% by weight by controlling average pressure and average temperature in the selected section such that the average pressure in the selected section is greater than the pressure (p) set forth in the following equation for an assessed average temperature (T) in the selected section:
• p=e[−14000/T+25]
• where p is measured in psia and T is measured in °Kelvin.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation to raise an average temperature within the selected section to, or above, a temperature that will pyrolyze hydrocarbons within the selected section;
• producing a mixture from the formation;
• and
• controlling an atomic hydrogen to carbon ratio of the produced mixture to be greater than about 1.7 by controlling average pressure and average temperature in the selected section such that the average pressure in the selected section is greater than the pressure (p) set forth in the following equation for an assessed average temperature (T) in the selected section:
• p=e[38000/T+61]
• where p is measured in psia and T is measured in °Kelvin.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• controlling a pressure-temperature relationship within at least the selected section of the formation by selected energy input into the one or more heat sources and by pressure release from the selected section through wellbores of the one or more heat sources;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• heating a selected volume (V) of the hydrocarbon containing formation, wherein formation has an average heat capacity (Cv), and wherein the heating pyrolyzes at least some hydrocarbons within the selected volume of the formation;
• and
• wherein heating energy/day provided to the volume is equal to or less than Pwr, wherein Pwr is calculated by the equation:
• Pwr=h*V*Cv*ρB
• wherein Pwr is the heating energy/day, h is an average heating rate of the formation, ρB is formation bulk density, and wherein the heating rate is less than about 10° C./day.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation to raise an average temperature within the selected section to, or above, a temperature that will pyrolyze hydrocarbons within the selected section;
• controlling heat output from the one or more heat sources such that an average heating rate of the selected section rises by less than about 3° C. per day when the average temperature of the selected section is at, or above, the temperature that will pyrolyze hydrocarbons within the selected section;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• to heat a selected section of the formation to an average temperature above about 270° C.;
• allowing the heat to transfer from the one or more heat sources to the selected section of the formation;
• controlling the heat from the one or more heat sources such that an average heating rate of the selected section is less than about 3° C. per day during pyrolysis;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• producing a mixture from the formation through at least one production well;
• monitoring a temperature at or in the production well;
• and
• controlling heat input to raise the monitored temperature at a rate of less than about 3° C. per day.

A method of treating a hydrocarbon containing formation in situ, comprising:

• heating a portion of the formation to a temperature sufficient to support oxidation of hydrocarbons within the portion, wherein the portion is located substantially adjacent to a wellbore;
• flowing an oxidant through a conduit positioned within the wellbore to a heat source zone within the portion, wherein the heat source zone supports an oxidation reaction between hydrocarbons and the oxidant;
• reacting a portion of the oxidant with hydrocarbons to generate heat;
• and
• transferring generated heat substantially by conduction to a pyrolysis zone of the formation to pyrolyze at least a portion of the hydrocarbons within the pyrolysis zone.

A method of treating a hydrocarbon containing formation in situ, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidant;
• flowing the oxidant into a conduit, and wherein the conduit is connected such that the oxidant can flow from the conduit to the hydrocarbons;
• allowing the oxidant and the hydrocarbons to react to produce heat in a heat source zone;
• allowing heat to transfer from the heat source zone to a pyrolysis zone in the formation to pyrolyze at least a portion of the hydrocarbons within the pyrolysis zone;
• and
• removing reaction products such that the reaction products are inhibited from flowing from the heat source zone to the pyrolysis zone.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein the portion is located substantially adjacent to an opening in the formation;
• providing the oxidizing fluid to a heat source zone in the formation;
• allowing the oxidizing gas to react with at least a portion of the hydrocarbons at the heat source zone to generate heat in the heat source zone;
• and
• transferring the generated heat substantially by conduction from the heat source zone to a pyrolysis zone in the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• producing a mixture from the formation;
• and
• maintaining an average temperature within the selected section above a minimum pyrolysis temperature and below a vaporization temperature of hydrocarbons having carbon numbers greater than 25 to inhibit production of a substantial amount of hydrocarbons having carbon numbers greater than 25 in the mixture.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• controlling a pressure within the formation to inhibit production of hydrocarbons from the formation having carbon numbers greater than 25;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation, wherein the produced mixture comprises condensable hydrocarbons, and wherein about 0.1% by weight to about 15% by weight of the condensable hydrocarbons are olefins.

A method of treating a hydrocarbon containing formation in situ, comprising:

• heating a section of the formation to a pyrolysis temperature from at least a first heat source, a second heat source and a third heat source, and wherein the first heat source, the second heat source and the third heat source are located along a perimeter of the section;
• controlling heat input to the first heat source, the second heat source and the third heat source to limit a heating rate of the section to a rate configured to produce a mixture from the formation with an olefin content of less than about 15% by weight of condensable fluids (on a dry basis) within the produced mixture;
• and
• producing the mixture from the formation through a production well.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources, to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation, wherein the produced mixture comprises condensable hydrocarbons, and wherein less than about 1% by weight, when calculated on an atomic basis, of the condensable hydrocarbons is nitrogen.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation, wherein the produced mixture comprises condensable hydrocarbons, and wherein less than about 1% by weight, when calculated on an atomic basis, of the condensable hydrocarbons is oxygen.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation, wherein the produced mixture comprises condensable hydrocarbons, and wherein less than about 1% by weight, when calculated on an atomic basis, of the condensable hydrocarbons is sulfur.

A method of treating a hydrocarbon containing formation in situ, comprising:

• raising a temperature of a first section of the formation with one or more heat sources to a first pyrolysis temperature;
• heating the first section to an upper pyrolysis temperature, wherein heat is supplied to the first section at a rate configured to inhibit olefin production;
• producing a first mixture from the formation, wherein the first mixture comprises condensable hydrocarbons and H2;
• creating a second mixture from the first mixture, wherein the second mixture comprises a higher concentration of H2 than the first mixture;
• raising a temperature of a second section of the formation with one or more heat sources to a second pyrolysis temperature;
• providing a portion of the second mixture to the second section;
• heating the second section to an upper pyrolysis temperature, wherein heat is supplied to the second section at a rate configured to inhibit olefin production;
• and
• producing a third mixture from the second section.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• producing a mixture from the formation;
• and
• hydrogenating a portion of the produced mixture with H2 produced from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• heating a first section of the formation;
• producing H2 from the first section of formation;
• heating a second section of the formation;
• and
• recirculating a portion of the H2 from the first section into the second section of the formation to provide a reducing environment within the second section of the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• producing a mixture from the formation;
• and
• controlling formation conditions such that the mixture produced from the formation comprises condensable hydrocarbons including H2, wherein the partial pressure of H2 within the mixture is greater than about 0.5 bar.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• maintaining a pressure of the selected section above atmospheric pressure to increase a partial pressure of H2, as compared to the partial pressure of H2 at atmospheric pressure, in at least a majority of the selected section;
• and
• producing a mixture from the formation, wherein the produced mixture comprises condensable hydrocarbons having an API gravity of at least about 25°.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• providing H2 to the formation to produce a reducing environment in at least some of the formation;
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation,
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• providing H2 to the selected section to hydrogenate hydrocarbons within the selected section and to heat a portion of the section with heat from the hydrogenation;
• and
• controlling heating of the selected section by controlling amounts of H2 provided to the selected section.

An in situ method for producing H2 from a hydrocarbon containing formation, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation, wherein a H2 partial pressure within the mixture is greater than about 0.5 bar.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section has been selected for heating using an atomic hydrogen weight percentage of at least a portion of hydrocarbons in the selected section, and wherein at least the portion of the hydrocarbons in the selected section comprises an atomic hydrogen weight percentage, when measured on a dry, ash-free basis, of greater than about 4.0%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein at least some hydrocarbons within the selected section have an initial atomic hydrogen weight percentage of greater than about 4.0%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section has been selected for heating using vitrinite reflectance of at least some hydrocarbons in the selected section, and wherein at least a portion of the hydrocarbons in the selected section comprises a vitrinite reflectance of greater than about 0.3%;
• wherein at least a portion of the hydrocarbons in the selected section comprises a vitrinite reflectance of less than about 4.5%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section has been selected for heating using a total organic matter weight percentage of at least a portion of the selected section, and wherein at least the portion of the selected section comprises a total organic matter weight percentage, of at least about 5.0%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein at least some hydrocarbons within the selected section have an initial total organic matter weight percentage of at least about 5.0%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section has been selected for heating using an atomic oxygen weight percentage of at least a portion of hydrocarbons in the selected section, and wherein at least a portion of the hydrocarbons in the selected section comprises an atomic oxygen weight percentage of less than about 15% when measured on a dry, ash free basis;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to a selected section of the formation;
• allowing the heat to transfer from the one or more heat sources to the selected section of the formation to pyrolyze hydrocarbon within the selected section;
• wherein at least some hydrocarbons within the selected section have an initial atomic oxygen weight percentage of less than about 15%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section has been selected for heating using an atomic hydrogen to carbon ratio of at least a portion of hydrocarbons in the selected section, wherein at least a portion of the hydrocarbons in the selected section comprises an atomic hydrogen to carbon ratio greater than about 0.70, and wherein the atomic hydrogen to carbon ratio is less than about 1.65;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to a selected section of the formation;
• allowing the heat to transfer from the one or more heat sources to the selected section of the formation to pyrolyze hydrocarbons within the selected section;
• wherein at least some hydrocarbons within the selected section have an initial atomic hydrogen to carbon ratio greater than about 0.70;
• wherein the initial atomic hydrogen to carbon ration is less than about 1.65;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section has been selected for heating using an atomic oxygen to carbon ratio of at least a portion of hydrocarbons in the selected section, wherein at least a portion of the hydrocarbons in the selected section comprises an atomic oxygen to carbon ratio greater than about 0.025, and wherein the atomic oxygen to carbon ratio of at least a portion of the hydrocarbons in the selected section is less than about 0.15 and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to a selected section of the formation;
• allowing the heat to transfer from the one or more heat sources to the selected section of the formation to pyrolyze hydrocarbons within the selected section;
• wherein at least some hydrocarbons within the selected section have an initial atomic oxygen to carbon ratio greater than about 0.025;
• wherein the initial atomic oxygen to carbon ratio is less than about 0.15;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section has been selected for heating using a moisture content in the selected section, and wherein at least a portion of the selected section comprises a moisture content of less than about 15%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to a selected section of the formation;
• allowing the heat to transfer from the one or more heat sources to the selected section of the formation;
• wherein at least a portion of the selected section has an initial moisture content of less than about 15%;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• wherein the selected section is heated in a reducing environment during at least a portion of the time that the selected section is being heated;
• and
• producing a mixture from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• heating a first section of the formation to produce a mixture from the formation;
• heating a second section of the formation;
• and
• recirculating a portion of the produced mixture from the first section into the second section of the formation to provide a reducing environment within the second section of the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• controlling the heat to yield at least about 15% by weight of a total organic carbon content of at least some of the hydrocarbon containing formation into condensable hydrocarbons.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• controlling the heat to yield greater than about 60% by weight of condensable hydrocarbons, as measured by the Fischer Assay.

A method of treating a hydrocarbon containing formation in situ, comprising:

• heating a first section of the formation to pyrolyze at least some hydrocarbons in the first section and produce a first mixture from the formation;
• heating a second section of the formation to pyrolyze at least some hydrocarbons in the second section and produce a second mixture from the formation;
• and
• leaving an unpyrolyzed section between the first section and the second section to inhibit subsidence of the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation through one or more production wells, wherein the heating is controlled such that the mixture can be produced from the formation as a vapor, and wherein at least about 7 heat sources are disposed in the formation for each production well.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation, wherein the one or more heat sources are disposed within one or more first wells;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation through one or more second wells, wherein one or more of the first or second wells are initially used for a first purpose and are then used for one or more other purposes.

A method for forming heater wells in a hydrocarbon containing formation, comprising:

• forming a first wellbore in the formation;
• forming a second wellbore in the formation using magnetic tracking such that the second wellbore is arranged substantially parallel to the first wellbore;
• and
• providing at least one heating mechanism within the first wellbore and at least one heating mechanism within the second wellbore such that the heating mechanisms can provide heat to at least a portion of the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation through a production well, wherein the production well is located such that a majority of the mixture produced from the formation comprises non-condensable hydrocarbons and a non-condensable component comprising hydrogen.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat to at least a portion of the formation from one or more first heat sources placed within a pattern in the formation;
• allowing the heat to transfer from the one or more first heat sources to a first section of the formation;
• heating a second section of the formation with at least one second heat source, wherein the second section is located within the first section, and wherein at least the one second heat source is configured to raise an average temperature of a portion of the second section to a higher temperature than an average temperature of the first section;
• and
• producing a mixture from the formation through a production well positioned within the second section, wherein a majority of the produced mixture comprises non-condensable hydrocarbons and a non-condensable component comprising H2 components.

A system configured to heat a hydrocarbon containing formation, comprising:

• a heater disposed in an opening in the formation, wherein the heater is configured to provide heat to at least a portion of the formation during use;
• an oxidizing fluid source;
• a conduit disposed in the opening wherein the conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, and wherein the oxidizing fluid is selected to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is configured to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• a heater configurable to be disposed in an opening in the formation, wherein the heater is further configurable to provide heat to at least a portion of the formation during use;
• a conduit configurable to be disposed in the opening, wherein the conduit is configurable to provide an oxidizing fluid from an oxidizing fluid source to a reaction zone in the formation during use, and wherein the system is configurable to allow the oxidizing fluid to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is further configurable to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid;
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing fluid to react with at least a portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

A system configured to heat a hydrocarbon containing formation, comprising:

• a heater disposed in an opening in the formation, wherein the heater is configured to provide heat to at least a portion of the formation during use;
• an oxidizing fluid source;
• a conduit disposed in the opening, wherein the conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, wherein the oxidizing fluid is selected to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone, and wherein the conduit is further configured to remove an oxidation product from the formation during use;
• and
• wherein the system is configured to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• a heater configurable to be disposed in an opening in the formation, wherein the heater is further configurable to provide heat to at least a portion of the formation during use;
• a conduit configurable to be disposed in the opening, wherein the conduit is further configurable to provide an oxidizing fluid from an oxidizing fluid source to a reaction zone in the formation during use, wherein the system is configurable to allow the oxidizing fluid to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone, and wherein the conduit is further configurable to remove an oxidation product from the formation during use;
• and
• wherein the system is further configurable to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein the portion is located substantially adjacent to an opening in the formation:
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing gas to react with at least a portion of the hydrocarbons at the reaction zone to generate heat in the reaction zone;
• removing at least a portion of an oxidation product through the opening;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

A system configured to heat a hydrocarbon containing formation, comprising:

• an electric heater disposed in an opening in the formation, wherein the electric heater is configured to provide heat to at least a portion of the formation during use;
• an oxidizing fluid source;
• a conduit disposed in the opening, wherein the conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, and wherein the oxidizing fluid is selected to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is configured to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• an electric heater configurable to be disposed in an opening in the formation, wherein the electric heater is further configurable to provide heat to at least a portion of the formation during use, and wherein at least the portion is located substantially adjacent to the opening;
• a conduit configurable to be disposed in the opening, wherein the conduit is further configurable to provide an oxidizing fluid from an oxidizing fluid source to a reaction zone in the formation during use, and wherein the system is configurable to allow the oxidizing fluid to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is further configurable to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configured to heat a hydrocarbon containing formation, comprising:

• a conductor disposed in a first conduit, wherein the first conduit is disposed in an opening in the formation, and wherein the conductor is configured to provide heat to at least a portion of the formation during use;
• an oxidizing fluid source;
• a second conduit disposed in the opening, wherein the second conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, and wherein the oxidizing fluid is selected to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is configured to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• a conductor configurable to be disposed in a first conduit, wherein the first conduit is configurable to be disposed in an opening in the formation, and wherein the conductor is further configurable to provide heat to at least a portion of the formation during use;
• a second conduit configurable to be disposed in the opening, wherein the second conduit is further configurable to provide an oxidizing fluid from an oxidizing fluid source to a reaction zone in the formation during use, and wherein the system is configurable to allow the oxidizing fluid to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is further configurable to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein heating comprises applying an electrical current to a conductor disposed in a first conduit to provide heat to the portion, and wherein the first conduit is disposed within the opening;
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing fluid to react with at least a portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

A system configured to heat a hydrocarbon containing formation, comprising:

• an insulated conductor disposed in an opening in the formation, wherein the insulated conductor is configured to provide heat to at least a portion of the formation during use;
• an oxidizing fluid source;
• a conduit disposed in the opening, wherein the conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, and wherein the oxidizing fluid is selected to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is configured to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• an insulated conductor configurable to be disposed in an opening in the formation, wherein the insulated conductor is further configurable to provide heat to at least a portion of the formation during use;
• a conduit configurable to be disposed in the opening, wherein the conduit is further configurable to provide an oxidizing fluid from an oxidizing fluid source to a reaction zone in the formation during use, and wherein the system is configurable to allow the oxidizing fluid to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is further configurable to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein heating comprises applying an electrical current to an insulated conductor to provide heat to the portion, and wherein the insulated conductor is disposed within the opening;
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing fluid to react with at least a portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein the portion is located substantially adjacent to an opening in the formation, wherein heating comprises applying an electrical current to an insulated conductor to provide heat to the portion, wherein the insulated conductor is coupled to a conduit, wherein the conduit comprises critical flow orifices, and wherein the conduit is disposed within the opening;
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing fluid to react with at least a portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

A system configured to heat a hydrocarbon containing formation, comprising:

• at least one elongated member disposed in an opening in the formation, wherein at least the one elongated member is configured to provide heat to at least a portion of the formation during use;
• an oxidizing fluid source;
• a conduit disposed in the opening, wherein the conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, and wherein the oxidizing fluid is selected to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is configured to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• at least one elongated member configurable to be disposed in an opening in the formation, wherein at least the one elongated member is further configurable to provide heat to at least a portion of the formation during use;
• a conduit configurable to be disposed in the opening, wherein the conduit is further configurable to provide an oxidizing fluid from the oxidizing fluid source to a reaction zone in the formation during use, and wherein the system is configurable to allow the oxidizing fluid to oxidize at least some hydrocarbons at the reaction zone during use such that heat is generated at the reaction zone;
• and
• wherein the system is further configurable to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein heating comprises applying an electrical current to at least one elongated member to provide heat to the portion, and wherein at least the one elongated member is disposed within the opening:
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing fluid to react with at least a portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

A system configured to heat a hydrocarbon containing formation, comprising:

• a heat exchanger disposed external to the formation, wherein the heat exchanger is configured to heat an oxidizing fluid during use;
• a conduit disposed in the opening, wherein the conduit is configured to provide the heated oxidizing fluid from the heat exchanger to at least a portion of the formation during use, wherein the system is configured to allow heat to transfer from the heated oxidizing fluid to at least the portion of the formation during use, and wherein the oxidizing fluid is selected to oxidize at least some hydrocarbons at a reaction zone in the formation during use such that heat is generated at the reaction zone;
• and
• wherein the system is configured to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• a heat exchanger configurable to be disposed external to the formation, wherein the heat exchanger is further configurable to heat an oxidizing fluid during use;
• a conduit configurable to be disposed in the opening, wherein the conduit is further configurable to provide the heated oxidizing fluid from the heat exchanger to at least a portion of the formation during use, wherein the system is configurable to allow heat to transfer from the heated oxidizing fluid to at least the portion of the formation during use, and wherein the system is further configurable to allow the oxidizing fluid to oxidize at least some hydrocarbons at a reaction zone in the formation during use such that heat is generated at the reaction zone;
• and
• wherein the system is further configurable to allow heat to transfer substantially by conduction from the reaction zone to a pyrolysis zone of the formation during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein heating comprises:
• heating the oxidizing fluid with a heat exchanger, wherein the heat exchanger is disposed external to the formation;
• providing the heated oxidizing fluid from the heat exchanger to the portion of the formation;
• and
• allowing heat to transfer from the heated oxidizing fluid to the portion of the formation;
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing fluid to react with at least a portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

An in situ method for heating a hydrocarbon containing formation, comprising:

• heating a portion of the formation to a temperature sufficient to support reaction of hydrocarbons within the portion of the formation with an oxidizing fluid, wherein heating comprises:
• oxidizing a fuel gas in a heater, wherein the heater is disposed external to the formation;
• providing the oxidized fuel gas from the heater to the portion of the formation;
• and
• allowing heat to transfer from the oxidized fuel gas to the portion of the formation;
• providing the oxidizing fluid to a reaction zone in the formation;
• allowing the oxidizing fluid to react with at least a portion of the hydrocarbons at the reaction zone to generate heat at the reaction zone;
• and
• transferring the generated heat substantially by conduction from the reaction zone to a pyrolysis zone in the formation.

A system configured to heat a hydrocarbon containing formation, comprising:

• a first conductor disposed in a first conduit, wherein the first conduit is disposed within a first opening in the formation;
• a second conductor disposed in a second conduit, wherein the second conduit is disposed within a second opening in the formation;
• a third conductor disposed in a third conduit, wherein the third conduit is disposed within a third opening in the formation, wherein the first, second, and third conductors are electrically coupled in a 3-phase Y configuration, and wherein the first, second, and third conductors are configured to provide heat to at least a portion of the formation during use;
• and
• wherein the system is configured to allow heat to transfer from the first, second, and third conductors to a selected section of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• a first conductor configurable to be disposed in a first conduit, wherein the first conduit is configurable to be disposed within a first opening in the formation;
• a second conductor configurable to be disposed in a second conduit, wherein the second conduit is configurable to be disposed within a second opening in the formation;
• a third conductor configurable to be disposed in a third conduit, wherein the third conduit is configurable to be disposed within a third opening in the formation, wherein the first, second, and third conductors are further configurable to be electrically coupled in a 3-phase Y configuration, and wherein the first, second, and third conductors are further configurable to provide heat to at least a portion of the formation during use;
• and
• wherein the system is configurable to allow heat to transfer from the first, second, and third conductors to a selected section of the formation during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• applying an electrical current to a first conductor to provide heat to at least a portion of the formation, wherein the first conductor is disposed in a first conduit, and wherein the first conduit is disposed within a first opening in the formation;
• applying an electrical current to a second conductor to provide heat to at least a portion of the formation, wherein the second conductor is disposed in a second conduit, and wherein the second conduit is disposed within a second opening in the formation;
• applying an electrical current to a third conductor to provide heat to at least a portion of the formation, wherein the third conductor is disposed in a third conduit, and wherein the third conduit is disposed within a third opening in the formation;
• and
• allowing the heat to transfer from the first, second, and third conductors to a selected section of the formation.

A system configured to heat a hydrocarbon containing formation, comprising:

• a first conductor disposed in a conduit, wherein the conduit is disposed within an opening in the formation;
• and
• a second conductor disposed in the conduit, wherein the second conductor is electrically coupled to the first conductor with a connector, and wherein the first and second conductors are configured to provide heat to at least a portion of the formation during use;
• and
• wherein the system is configured to allow heat to transfer from the first and second conductors to a selected section of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• a first conductor configurable to be disposed in a conduit, wherein the conduit is configurable to be disposed within an opening in the formation;
• and
• a second conductor configurable to be disposed in the conduit, wherein the second conductor is configurable to be electrically coupled to the first conductor with a connector, and wherein the first and second conductors are further configurable to provide heat to at least a portion of the formation during use;
• and
• wherein the system is configurable to allow heat to transfer from the first and second conductors to a selected section of the formation during use.

A system configured to heat a hydrocarbon containing formation, comprising:

• at least one conductor disposed in a conduit, wherein the conduit is disposed within an opening in the formation, and wherein at least the one conductor is configured to provide heat to at least a first portion of the formation during use;
• at least one sliding connector, wherein at least the one sliding connector is coupled to at least the one conductor, wherein at least the one sliding connector is configured to provide heat during use, and wherein heat provided by at least the one sliding connector is substantially less than the heat provided by at least the one conductor during use;
• and
• wherein the system is configured to allow heat to transfer from at least the one conductor to a section of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• at least one conductor configurable to be disposed in a conduit, wherein the conduit is configurable to be disposed within an opening in the formation, and wherein at least the one conductor is further configurable to provide heat to at least a first portion of the formation during use;
• at least one sliding connector, wherein at least the one sliding connector is configurable to be coupled to at least the one conductor, wherein at least the one sliding connector is further configurable to provide heat during use, and wherein heat provided by at least the one sliding connector is substantially less than the heat provided by at least the one conductor during use;
• and
• wherein the system is configurable to allow heat to transfer from at least the one conductor to a section of the formation during use.

A system configured to heat a hydrocarbon containing formation, comprising:

• at least one elongated member disposed within an opening in the formation, wherein at least the one elongated member is configured to provide heat to at least a portion of the formation during use;
• an oxidizing fluid source;
• a conduit disposed within the opening, wherein the conduit is configured to provide an oxidizing fluid from the oxidizing fluid source to the opening during use, and wherein the oxidizing fluid is selected to substantially inhibit carbon deposition on or proximate to at least the one elongated member during use;
• and
• wherein the system is configured to allow heat to transfer from at least the one elongated member to a section of the formation during use.

A system configurable to heat a hydrocarbon containing formation, comprising:

• at least one elongated member configurable to be disposed within an opening in the formation, wherein at least the one elongated member is further configurable to provide heat to at least a portion of the formation during use;
• a conduit configurable to be disposed within the opening, wherein the conduit is further configurable to provide an oxidizing fluid from the oxidizing fluid source to the opening during use, and wherein the system is configurable to allow the oxidizing fluid to substantially inhibit carbon deposition on or proximate to at least the one elongated member during use;
• and
• wherein the system is further configurable to allow heat to transfer from at least the one elongated member to a section of the formation during use.

An in situ method for heating a hydrocarbon containing formation, comprising:

• applying an electrical current to at least one elongated member to provide heat to at least a portion of the formation, wherein at least the one elongated member is disposed within an opening in the formation;
• providing an oxidizing fluid to at least the one elongated member to substantially inhibit carbon deposition on or proximate to at least the one elongated member;
• and
• allowing heat to transfer from at least the one elongated member to a section of the formation.

An in situ method for heating a hydrocarbon containing formation, comprising:

• oxidizing a fuel fluid in a heater;
• providing at least a portion of the oxidized fuel fluid into a conduit disposed in an opening of the formation;
• allowing heat to transfer from the oxidized fuel fluid to a section of the formation;
• and
• allowing additional heat to transfer from an electric heater disposed in the opening to the section of the formation, wherein heat is allowed to transfer substantially uniformly along a length of the opening.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the formation, wherein the one or more heat sources are disposed within one or more open wellbores in the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation;
• and
• producing a mixture from the formation.

A mixture produced from a portion of a hydrocarbon containing formation, the mixture comprising:

• non-condensable hydrocarbons comprising hydrocarbons having carbon numbers of less than 5, wherein a weight ratio of hydrocarbons having carbon numbers from 2 through 4, to methane, is greater than approximately 1;
• condensable hydrocarbons;
• wherein less than about 1% by weight, when calculated on an atomic basis, of the condensable hydrocarbons comprises nitrogen;
• wherein less than about 1% by weight, when calculated on an atomic basis, of the condensable hydrocarbons comprises oxygen;
• and
• wherein less than about 1% by weight, when calculated on an atomic basis, of the condensable hydrocarbons comprises sulfur.

A mixture produced from a portion of a hydrocarbon containing formation, the mixture comprising:

• non-condensable hydrocarbons comprising hydrocarbons having carbon numbers of less than 5, wherein a weight ratio of hydrocarbons having carbon numbers from 2 through 4, to methane, is greater than approximately 1;
• ammonia, wherein greater than about 0.5% by weight of the mixture comprises ammonia;
• and
• condensable hydrocarbons comprising oxygenated hydrocarbons, wherein greater than about 5% by weight of the condensable hydrocarbons comprises oxygenated hydrocarbons.

A mixture produced from a portion of a hydrocarbon containing formation, comprising:

• condensable hydrocarbons, wherein less than about 15% by weight of the condensable hydrocarbons have a carbon number greater than about 25;
• wherein less than about 1% by weight of the condensable hydrocarbons, when calculated on an atomic basis, is nitrogen;
• wherein less than about 1% by weight of the condensable hydrocarbons, when calculated on an atomic basis, is oxygen;
• and
• wherein less than about 1% by weight of the condensable hydrocarbons, when calculated on an atomic basis, is sulfur.

A mixture produced from a portion of a hydrocarbon containing formation, comprising:

• non-condensable hydrocarbons comprising hydrocarbons having carbon numbers of less than about 5, wherein a weight ratio of the hydrocarbons having carbon number from 2 through 4, to methane, in the mixture is greater than approximately 1;
• wherein the non-condensable hydrocarbons further comprise H2, wherein greater than about 15% by weight of the non-condensable hydrocarbons comprises H2;
• and
• condensable hydrocarbons, comprising:
• oxygenated hydrocarbons, wherein greater than about 1.5% by weight of the condensable hydrocarbons comprises oxygenated hydrocarbons;
• olefins, wherein less than about 10% by weight of the condensable hydrocarbons comprises olefins;
• and
• aromatic compounds, wherein greater than about 20% by weight of the condensable hydrocarbons comprises aromatic compounds.

A mixture produced from a portion of a hydrocarbon containing formation, comprising:

• condensable hydrocarbons, wherein less than about 5% by weight of the condensable hydrocarbons comprises hydrocarbons having a carbon number greater than about 25;
• wherein th e condensable hydrocarbons further comprise:
• oxygenated hydrocarbons, wherein greater than about 5% by weight of the condensable hydrocarbons comprises oxygenated hydrocarbons;
• olefins, wherein less than about 10% by weight of the condensable hydrocarbons comprises olefins;
• and
• aromatic compounds, wherein greater than about 30% by weight of the condensable hydrocarbons comprises aromatic compounds;
• and
• non-condensable hydrocarbons comprising H2, wherein greater than about 15% by weight of the non-condensable hydrocarbons comprises H2.

A condensable mixture produced from a portion of a hydrocarbon containing formation, comprising:

• olefins, wherein about 0.1% by weight to about 15% by weight of the condensable mixture comprises olefins;
• oxygenated hydrocarbons, wherein less than about 15% by weight of the condensable mixture comprises oxygenated hydrocarbons;
• and
• asphaltenes, wherein less than about 0.1% by weight of the condensable mixture comprises asphaltenes.

A condensable mixture produced from a portion of a hydrocarbon containing formation, comprising:

• olefins, wherein about 0.1% by weight to about 2% by weight of the condensable mixture comprises olefins;
• multi-ring aromatics, wherein less than about 2% by weight of the condensable mixture comprises multi-ring aromatics with more than two rings;
• and
• oxygenated hydrocarbons, wherein greater than about 25% by weight of the condensable mixture comprises oxygenated hydrocarbons.

A mixture produced from a portion of a hydrocarbon containing formation, comprising:

• non-condensable hydrocarbons and H2, wherein greater than about 10% by volume of the non-condensable hydrocarbons and H2 comprises H2;
• ammonia and water, wherein greater than about 0.5% by weight of the mixture comprises ammonia;
• and
• condensable hydrocarbons.

A method for in situ production of synthesis gas from a hydrocarbon containing formation, comprising:

• heating a section of the formation to a temperature sufficient to allow synthesis gas generation, wherein a permeability of the section is substantially uniform and greater than a permeability of an unheated section of the formation when the temperature sufficient to allow synthesis gas generation within the formation is achieved;
• providing a synthesis gas generating fluid to the section to generate synthesis gas;
• and
• removing synthesis gas from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to substantially uniformly increase a permeability of the portion and to increase a temperature of the portion to a temperature sufficient to allow synthesis gas generation;
• providing a synthesis gas generating fluid to at least the portion of the selected section, wherein the synthesis gas generating fluid comprises carbon dioxide;
• obtaining a portion of the carbon dioxide of the synthesis gas generating fluid from the formation;
• and
• producing synthesis gas from the formation.

A method of in situ synthesis gas production, comprising:

• providing heat from one or more flameless distributed combustor heaters to at least a first portion of a carbon containing formation;
• allowing the heat to transfer from the one or more heaters to a selected section of the formation such that the heat from the one or more heaters substantially uniformly increases a permeability of the selected section, and to raise a temperature of the selected section to a temperature sufficient to generate synthesis gas;
• introducing a synthesis gas producing fluid into the selected section to generate synthesis gas;
• and
• removing synthesis gas from the formation.

A method of treating a hydrocarbon containing formation, comprising:

• heating a portion of the formation with one or more electrical heaters to a temperature sufficient to pyrolyze hydrocarbons within the portion;
• producing pyrolyzation fluid from the formation;
• separating a fuel cell feed stream from the pyrolyzation fluid;
• and
• directing the fuel cell feed stream to a fuel cell to produce electricity;

A method for in situ production of synthesis gas from a hydrocarbon containing formation, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that the heat from the one or more heat sources pyrolyzes at least some of the hydrocarbons within the selected section of the formation;
• producing pyrolysis products from the formation;
• heating at least a portion of the selected section to a temperature sufficient to generate synthesis gas;
• providing a synthesis gas generating fluid to at least the portion of the selected section to generate synthesis gas;
• and
• producing a portion of the synthesis gas from the formation.

A method for in situ production of synthesis gas from a hydrocarbon containing formation, comprising:

• heating a first portion of the formation to pyrolyze some hydrocarbons within the first portion,
• allowing the heat to transfer from one or more heat sources to a selected section of the formation,
• pyrolyzing hydrocarbons within the selected section;
• producing fluid from the first portion, wherein the fluid comprises an aqueous fluid and a hydrocarbon fluid;
• heating a second portion of the formation to a temperature sufficient to allow synthesis gas generation;
• introducing at least a portion of the aqueous fluid to the second section after the section reaches the temperature sufficient to allow synthesis gas generation;
• and
• producing synthesis gas from the formation.

A method for in situ production of synthesis gas from a carbon containing formation, comprising:

• heating a portion of the formation with one or more heat sources to create increased and substantially uniform permeability within a portion of the formation and to raise a temperature within the portion to a temperature sufficient to allow synthesis gas generation;
• providing a synthesis gas generating fluid into the portion through at least one injection wellbore to generate synthesis gas from hydrocarbons and the synthesis gas generating fluid;
• and
• producing synthesis gas from at least one heat source wellbore in which is positioned proximate to a heat source of the one or more heat sources.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that the heat from the one or more heat sources pyrolyzes at least a portion of the carbon containing material within the selected section of the formation;
• producing pyrolysis products from the formation;
• heating a first portion of a formation with one or more heat sources to a temperature sufficient to allow generation of synthesis gas;
• providing a first synthesis gas generating fluid to the first portion to generate a first synthesis gas;
• removing a portion of the first synthesis gas from the formation;
• heating a second portion of a formation with one more heat sources to a temperature sufficient to allow generation of synthesis gas having a H2 to CO ratio greater than a H2 to CO ratio of the first synthesis gas;
• providing a second synthesis gas generating component to the second portion to generate a second synthesis gas;
• removing a portion of the second synthesis gas from the formation;
• and
• blending a portion of the first synthesis gas with a portion of the second synthesis gas to produce a blended synthesis gas having a selected H2 to CO ratio.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that the heat from the one or more heat sources pyrolyzes at least some of the hydrocarbons within the selected section of the formation;
• producing pyrolysis products from the formation;
• heating at least a portion of the selected section to a temperature sufficient to generate synthesis gas;
• controlling a temperature of at least a portion of the selected section to generate synthesis gas having a selected H2 to CO ratio;
• providing a synthesis gas generating fluid to at least the portion of the selected section to generate synthesis gas;
• and
• producing a portion of the synthesis gas from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that the heat from the one or more heat sources pyrolyzes at least some of the hydrocarbons within the selected section of the formation;
• producing pyrolysis products from the formation;
• heating at least a portion of the selected section to a temperature sufficient to generate synthesis gas;
• controlling a temperature in or proximate to a synthesis gas production well to generate synthesis gas having a selected H2 to CO ratio;
• providing a synthesis gas generating fluid to at least the portion of the selected section to generate synthesis gas;
• and
• producing synthesis gas from the formation.

A method of treating a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that the heat from the one or more heat sources pyrolyzes at least some of the hydrocarbons within the selected section of the formation;
• producing pyrolysis products from the formation;
• heating at least a portion of the selected section to a temperature sufficient to generate synthesis gas;
• controlling a temperature of at least a portion of the selected section to generate synthesis gas having a H2 to CO ratio different than a selected H2 to CO ratio;
• providing a synthesis gas generating fluid to at least the portion of the selected section to generate synthesis gas;
• and
• producing synthesis gas from the formation;
• providing at least a portion of the produced synthesis gas to a shift process wherein an amount of carbon monoxide is converted to carbon dioxide;
• separating at least a portion of the carbon dioxide to obtain a gas having a selected H2 to CO ratio.

A method of sequestering carbon dioxide within a hydrocarbon containing formation, comprising:

• heating a portion of the formation to increase permeability and form a substantially uniform permeability within the portion;
• allowing the portion to cool;
• and
• storing carbon dioxide within the portion.

A method of in situ sequestration of carbon dioxide within a hydrocarbon containing formation in situ, comprising:

• providing heat from one or more heat sources to at least a first portion of the formation;
• allowing the heat to transfer from one or more sources to a selected section of the formation such that the heat from the one or more heat sources pyrolyzes at least some of the hydrocarbons within the selected section of the formation;
• producing pyrolyzation fluids, wherein the pyrolyzation fluids comprise carbon dioxide;
• and
• storing an amount of carbon dioxide in the formation, wherein the amount of stored carbon dioxide is equal to or greater than an amount of carbon dioxide within the pyrolyzation fluids.

A method for in situ production of energy from a hydrocarbon containing formation, comprising:

• providing heat from one or more heat sources to at least a portion of the formation;
• allowing the heat to transfer from the one or more heat sources to a selected section of the formation such that the heat from the one or more heat sources pyrolyzes at least a portion of the hydrocarbons within the selected section of the formation;
• producing pyrolysis products from the formation;
• providing at least a portion of the pyrolysis products to a reformer to generate synthesis gas;
• producing the synthesis gas from the reformer;
• providing at least a portion of the produced synthesis gas to a fuel cell to produce electricity, wherein the fuel cell produces a carbon dioxide containing exit stream;
• and
• storing at least a portion of the carbon dioxide in the carbon dioxide containing exit stream in a subsurface formation.

A method for producing ammonia using a carbon containing formation, comprising:

• separating air to produce an O2 rich stream and a N2 rich stream;
• heating a selected section of the formation to a temperature sufficient to support reaction of carbon-containing material in the formation to form synthesis gas;
• providing synthesis gas generating fluid and at least a portion of the O2 rich stream to the selected section;
• allowing the synthesis gas generating fluid and O2 in the O2 rich stream to react with at least a portion of the carbon-containing material in the formation to generate synthesis gas;
• producing synthesis gas from the formation, wherein the synthesis gas comprises H2 and CO;
• providing at least a portion of the H2 in the synthesis gas to an ammonia synthesis process;
• providing N2 to the ammonia synthesis process;
• and
• using the ammonia synthesis process to generate ammonia.

A method for producing ammonia using a carbon containing formation, comprising:

• generating a first ammonia feed stream from a first portion of the formation;
• generating a second ammonia feed stream from a second portion of the formation, wherein the second ammonia feed stream has a H2 to N2 ratio greater than a H2 to N2 ratio of the first ammonia feed stream;
• blending at least a portion of the first ammonia feed stream with at least a portion of the second ammonia feed stream to produce a blended ammonia feed stream having a selected H2 to N2 ratio;
• providing the blended ammonia feed stream to an ammonia synthesis process;
• and
• using the ammonia synthesis process to generate ammonia.

A method for producing ammonia using a carbon containing formation, comprising:

• heating a selected section of the formation to a temperature sufficient to support reaction of carbon-containing material in the formation to form synthesis gas;
• providing a synthesis gas generating fluid and an O2 rich stream to the selected section, wherein the amount of N2 in the O2 rich stream is sufficient to generate synthesis gas having a selected ratio of H2 to N2;
• allowing the synthesis gas generating fluid and O2 in the O2 rich stream to react with at least a portion of the carbon-containing material in the formation to generate synthesis gas having a selected ratio of H2 to N2;
• producing the synthesis gas from the formation;
• providing at least a portion of the H2 and N2 in the synthesis gas to an ammonia synthesis process;
• using the ammonia synthesis process to generate ammonia.

A method for producing ammonia using a carbon containing formation, comprising:

• providing a first stream comprising N2 and carbon dioxide to the formation;
• allowing at least a portion of the carbon dioxide in the first stream to adsorb in the formation;
• producing a second stream from the formation, wherein the second stream comprises a lower percentage of carbon dioxide than the first stream;
• providing at least a portion of the N2 in the second stream to an ammonia synthesis process.

A method of treating a hydrocarbon containing permeable formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the permeable formation;
• allowing the heat to transfer from the one or more heat sources to a selected mobilization section of the permeable formation such that the heat from the one or more heat sources can mobilize at least some of the hydrocarbons within the selected mobilization section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected mobilization section of the permeable formation is less than about 150° C.;
• allowing the heat to transfer from the one or more heat sources to a selected pyrolyzation section of the permeable formation such that the heat from the one or more heat sources can pyrolyze at least some of the hydrocarbons within the selected pyrolyzation section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected pyrolyzation section of the permeable formation is less than about 375° C.;
• and
• producing a mixture from the permeable formation.

A method of treating a hydrocarbon containing permeable formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the permeable formation;
• allowing the heat to transfer from the one or more heat sources to a selected mobilization section of the permeable formation such that the heat from the one or more heat sources can mobilize at least some of the hydrocarbons within the selected mobilization section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected mobilization section of the permeable formation is less than about 150° C.;
• allowing the heat to transfer from the one or more heat sources to a selected pyrolyzation section of the permeable formation such that the heat from the one or more heat sources can pyrolyze at least some of the hydrocarbons within the selected pyrolyzation section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected pyrolyzation section of the permeable formation is less than about 375° C.;
• allowing at least some of the mobilized hydrocarbons to flow from the selected mobilization section of the permeable formation to the selected pyrolyzation section of the permeable formation;
• and
• producing a mixture from the permeable formation.

A method of treating a hydrocarbon containing permeable formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the permeable formation;
• allowing the heat to transfer from the one or more heat sources to a selected mobilization section of the permeable formation such that the heat from the one or more heat sources can mobilize at least some of the hydrocarbons within the selected mobilization section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected mobilization section of the permeable formation is less than about 150° C.;
• allowing the heat to transfer from the one or more heat sources to a selected pyrolyzation section of the permeable formation such that the heat from the one or more heat sources can pyrolyze at least some of the hydrocarbons within the selected pyrolyzation section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected pyrolyzation section of the permeable formation is less than about 375° C.;
• allowing at least some of the mobilized hydrocarbons to flow from the selected mobilization section of the permeable formation to the selected pyrolyzation section of the permeable formation;
• providing a gas to the permeable formation, wherein the gas is configured to increase a flow of the mobilized hydrocarbons from the selected mobilization section of the permeable formation to the selected pyrolyzation section of the permeable formation;
• and
• producing a mixture from the permeable formation.

A method of treating a hydrocarbon containing permeable formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the permeable formation;
• allowing the heat to transfer from the one or more heat sources to a selected mobilization section of the permeable formation such that the heat from the one or more heat sources can mobilize at least some of the hydrocarbons within the selected mobilization section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected mobilization section of the permeable formation is less than about 150° C.;
• allowing the heat to transfer from the one or more heat sources to a selected pyrolyzation section of the permeable formation such that the heat from the one or more heat sources can pyrolyze at least some of the hydrocarbons within the selected pyrolyzation section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected pyrolyzation section of the permeable formation is less than about 375° C.;
• allowing at least some of the mobilized hydrocarbons to flow from the selected mobilization section of the permeable formation to the selected pyrolyzation section of the permeable formation;
• providing a gas to the permeable formation, wherein the gas is configured to increase a flow of the mobilized hydrocarbons from the selected mobilization section of the permeable formation to the selected pyrolyzation section of the permeable formation;
• controlling a pressure of the provided gas such that the flow of the mobilized hydrocarbons is controlled;
• and
• producing a mixture from the permeable formation.

A method of treating a hydrocarbon containing permeable formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the permeable formation;
• allowing the heat to transfer from the one or more heat sources to a selected mobilization section of the permeable formation such that the heat from the one or more heat sources can mobilize at least some of the hydrocarbons within the selected mobilization section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected mobilization section of the permeable formation is less than about 150° C.;
• allowing the heat to transfer from the one or more heat sources to a selected pyrolyzation section of the permeable formation such that the heat from the one or more heat sources can pyrolyze at least some of the hydrocarbons within the selected pyrolyzation section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected pyrolyzation section of the permeable formation is less than about 375° C.;
• and
• producing a mixture from the permeable formation in a production well, wherein the production well is disposed substantially horizontally within the permeable formation.

A method of treating a hydrocarbon containing permeable formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the permeable formation;
• allowing the heat to transfer from the one or more heat sources to a selected mobilization section of the permeable formation such that the heat from the one or more heat sources can mobilize at least some of the hydrocarbons within the selected mobilization section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected mobilization section of the permeable formation is less than about 150° C.;
• providing a gas to the permeable formation, wherein the gas is configured to increase a flow of the mobilized hydrocarbons within the permeable formation;
• and
• producing a mixture from the permeable formation.

A method of treating a hydrocarbon containing permeable formation in situ, comprising:

• providing heat from one or more heat sources to at least one portion of the permeable formation;
• allowing the heat to transfer from the one or more heat sources to a selected mobilization section of the permeable formation such that the heat from the one or more heat sources can mobilize at least some of the hydrocarbons within the selected mobilization section of the permeable formation;
• controlling the heat from the one or more heat sources such that an average temperature within at least a majority of the selected mobilization section of the permeable formation is less than about 150° C.;
• providing a gas to the permeable formation, wherein the gas is configured to increase a flow of the mobilized hydrocarbons within the permeable formation;
• controlling a pressure of the provided gas such that the flow of the mobilized hydrocarbons is controlled;
• and
• producing a mixture from the permeable formation.

A method for treating hydrocarbons in at least a portion of a hydrocarbon containing formation, wherein the portion has an average permeability of less than about 10 millidarcy, comprising:

• providing heat from one or more heat sources to the formation;
• allowing the heat to transfer from one or more of the heat sources to a selected section of the formation such that heat from the heat sources pyrolyzes at least some hydrocarbons within the selected section, and wherein heat from the heat sources increases the permeability of at least a portion of the selected section;
• and
• producing a mixture comprising hydrocarbons from the formation.

A method for treating hydrocarbons in at least a portion of a hydrocarbon containing formation, wherein the portion has an average permeability of less than about 10 millidarcy, comprising:

• providing heat from one or more heat sources to the formation;
• allowing the heat to transfer from one or more of the heat sources to a selected section of the formation such that heat from the heat sources pyrolyzes at least some hydrocarbons within the selected section, and wherein heat from the heat sources vaporizes at least a portion of the hydrocarbons in the selected section;
• and
• producing a mixture comprising hydrocarbons from the formation.

A method for treating hydrocarbons in at least a portion of a hydrocarbon containing formation, wherein the portion has an average permeability of less than about 10 millidarcy, comprising:

• providing heat from one or more heat sources to the formation, wherein at least one of the heat sources is located in a heater well;
• allowing the heat to transfer from one or more of the heat sources to a selected section of the formation such that heat from the heat sources pyrolyzes at least some hydrocarbons within the selected section, and wherein heat from the heat sources pressurizes at least a portion of the selected section;
• and
• producing a mixture comprising hydrocarbons from the formation, wherein the mixture is produced from one or more heater wells.

A method for treating hydrocarbons in at least a portion of a hydrocarbon containing formation, wherein the portion has an average permeability of less than about 10 millidarcy, comprising:

• providing heat from one or more heat sources to the formation;
• allowing the heat to transfer from one or more of the heat sources to a selected first section of the formation such that heat from the heat sources creates a pyrolysis zone wherein at least some hydrocarbons are pyrolyzed within the first selected section, and allowing the heat to transfer from one or more of the heat sources to a selected second section of the formation such that heat from the heat sources heats at least some hydrocarbons within the selected second section to a temperature less than the average temperature within the pyrolysis zone;
• and
• producing a mixture comprising hydrocarbons from the formation.

A method for treating hydrocarbons in at least a portion of a hydrocarbon containing formation, wherein the portion has an average permeability of less than about 10 millidarcy, comprising:

• providing heat from three or more heat sources to the formation;
• allowing the heat to transfer from three or more of the heat sources to a selected section of the formation such that heat from the heat sources pyrolyzes at least some hydrocarbons within the selected section, and at least three of the heat sources are arranged in a substantially triangular pattern;
• and
• producing a mixture comprising hydrocarbons from the formation.