Utilization of low BTU gas generated during in situ heating of organic-rich rock

A method for utilizing gas produced from an in situ conversion process, comprising:

• a) heating an organic-rich rock formation in situ, wherein the organic-rich rock formation is an oil shale formation;
• b) producing a production fluid from the organic-rich rock formation, the production fluid having been at least partially generated as a result of pyrolysis of formation hydrocarbons located in the organic-rich rock formation, the production fluid comprising hydrocarbon fluids;
• c) obtaining a gas stream from the production fluid, the gas stream comprising a combustible hydrocarbon fluid;
• d) separating the gas stream into a first composition gas stream and a second composition gas stream, wherein a composition of the first gas stream is maintained in a substantially constant condition, the first composition gas stream comprises methane and at least one inert gas and the first composition gas stream has a lower heating value less than 800 BTU/SCF;
• e) passing the first composition gas stream through a first gas turbine to form a first gas turbine exhaust stream, the first gas turbine being configured to provide energy to a first electrical generator;
• f) monitoring the first composition gas stream for one or more properties;
• and
• g) altering the composition of the first composition gas stream, thereby controlling one or more operating parameters of the first composition gas stream, wherein the first composition gas stream includes methane and wherein altering the composition of the first composition gas stream comprises reforming at least a portion of the methane in the first composition gas stream to generate hydrogen.

A method for utilizing gas produced from an in situ conversion process, comprising:

• a) heating an organic-rich rock formation in situ, wherein the organic-rich rock formation is an oil shale formation;
• b) producing a production fluid from the organic-rich rock formation, the production fluid having been at least partially generated as a result of pyrolysis of formation hydrocarbons located in the organic-rich rock formation, the production fluid comprising hydrocarbon fluids;
• c) obtaining a gas stream from the production fluid, the gas stream comprising a combustible hydrocarbon fluid;
• d) separating the gas stream into a first composition gas stream and a second composition gas stream, wherein a composition of the first gas stream is maintained in a substantially constant condition, the first composition gas stream comprises methane and at least one inert gas and the first composition gas stream has a lower heating value less than 800 BTU/SCF;
• e) passing the first composition gas stream through a first gas turbine to form a first gas turbine exhaust stream, the first gas turbine being configured to provide energy to a first electrical generator;
• f) separating NH3 from the production fluid to form an NH3 treatment stream;
• and
• g) injecting the NH3 into the first gas turbine exhaust stream, thereby converting a portion of NOx components in the first gas turbine exhaust stream to N2.