Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present
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United States of America Patent
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Dec 5, 2000
Issued Date -
N/A
app pub date -
May 27, 1997
filing date -
Nov 4, 1986
priority date (Note) -
Expired
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Abstract
Methods 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 Archie's Equations, determining the relative amounts of oil and gas present from measurements within a cased well, and then quantitatively determining the separate amounts of oil and gas present in the formation. Resistivity measurements are obtained from within the cased well by conducting A.C. current from within the cased well to a remote electrode at a frequency that is within the frequency range of 0.1 Hz to 20 Hz.
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