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A NEW WAY TO PROOFREAD OIL SATURATION THROUGH SEALED CORING UNDER USUAL PRESSURE

KONG Xiang-li (Geologic Science Research Institute,Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China)  
In the process of the sealed coring under ordinary pressure,we found some error in oil saturation between the analytic and the true due to drop in pressure and release of gas.We can use 1-Swi to proofread the oil saturation for pure reservoir because there is no active water in it.For the oilfield at the middle-late development stage,there is active water in stratum and also loss of some oil and water,1-Swi is no longer applicable to proofreading of oil saturation,otherwise,the result will be over high and a new way is needed.
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