G - Physics – 01 – V
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G01V 5/00 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1049159
ABSTRACT OF THE DISCLOSURE RADIOACTIVE LOGGING FOR DETERMINING OIL SATURATION IN A RESERVOIR A method is disclosed for determining oil saturations in a petroleum reservoir using logging signals indirectly re- lated to the abundance of carbon nuclei in the reservoir rock. The first step of the invention is to record a log sensitive to the abundance of carbon nuclei after the region surrounding the well bore is caused to have oil saturations representative of the bulk of the reservoir. A purposeful change is then made in the fluid saturations in the region surrounding the well bore by injecting a liquid capable of displacing substantially all of the original fluids. The log is recorded a second time. The displacing fluid is then itself displaced by brine, and a third log is recorded. Oil saturation is then determined from difference between the logs and from known fractional volume carbon contents of the reservoir oil and the first injected liquid. It is not necessary that the log response be independent of the material in the bore hole, the casing, the casing cement, or the reservoir rock. It is only necessary that changes in oil content cause proportional changes in log response.
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