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《WELL LOGGING TECHNOLOGY》 1996-05
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Determining Oil Saturation of Flooded Strata from Conventional Resistivity Logging

Han Qingzhong et al.  
It becomes more and more difficult to determine residual oil saturation of flooded formation from conventional resistivity logging data due to the high watercut and the salinity variations of formation water. For determining resistivity of formation water and residual oil saturation, two new methods have been introduced herein: ①On the basis of known formation water analysis data, SP downhole calibration, well to well correlation and dual SP techniques are used to determine current resistivity of the mixture of connate water and injected water, and then, water saturation can be obtained with resistivity correlation between the same formation of neighboring wells; ②Current water saturation of the flooded formation can be derived by the ratio method proposed to avoid the difficulties in determining the accurate value of formation factors m and a . Logging data from tens of wells in flooded strata have been processed with the above methods, which showed promising results.
【CateGory Index】: TD357.62
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