Processing formation resistivity measurements obtained from within a cased well used to quantitatively determine the amount of oil and gas present
OwnerWilliam Banning Vail IIIinventor
Life of this patent
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Abstract
Methods are provided to quantitatively determine the separate amounts of oil and gas in a geological formation adjacent to a cased well using measurements of formation resistivity. The steps include obtaining resistivity measurements from within a cased well of a given formation, obtaining the porosity, obtaining the resistivity of formation water present, computing the combined amounts of oil and gas present using the Archie Relations, determining the relative amounts of oil and gas present, and then quantitatively determining the separate amounts of oil and gas present in the formation.
Claims23
A method for processing related to hydrocarbons present in a geological formation adjacent to an electrical conductor, comprising:
- obtaining first information from within said electrical conductor related to a total resistivity of said geological formation;
- and
- processing second information related to porosity of said geological formation, third information related to salinity of any salt water present in said geological formation and said first information to arrive at processed information related to a combined amount of oil and gas present in said geological formation.
A method for determining related to hydrocarbons present in a geological formation adjacent to an electrical conductor, comprising:
- providing first information related to porosity of said geological formation;
- providing second information related to salinity of any salt water present in said geological formation;
- obtaining third information from within said electrical conductor to ascertain total resistivity of said geological formation;
- and
- determining determined information related to at least one of water saturation (Sw) and hydrocarbon saturation (Sh) using each of said first information, said second information and said third information.
Dependencies are inferred from the claim text.