G - Physics – 01 – V
Patent
G - Physics
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V
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G01V 5/00 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1049663
ABSTRACT OF THE DISCLOSURE LOW-COST BUT ACCURATE RADIOACTIVE LOGGING FOR DETERMINING WATER SATURATIONS IN A RESERVOIR A method is disclosed for determining water saturation in a petroleum reservoir using logging signals indirectly related to the abundances of oxygen nuclei in the reservoir rock. The first step of the invention is to record a log sensitive to the abundance of oxygen nuclei, after the region surrounding the well bore is caused to have fluid 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 injection 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. Water saturation is then determined from differences between the logs and from known fractional volume oxygen contents of the reservoir brine and the first injected liquid. It is not necessary that the log responses be independent of the material in the borehole, the casing, the casing cement, or the reservoir rock. It is only necessary that changes in formation content cause proportional changes in log responses.
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