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On Identifying Oil & Gas Bearing Layers Under the Complex Geologic Conditions

GENG Long-xiang,CHENG Feng,CAO Yu-shan (Exploration & Development Institute, Subsidiary of Zhongyuan Oilfield, Puyang, Henan 457001, China)  
There are many factors to affect identification of oil and gas bearing layers in the sand-shale formation.Especially, it is more difficult to accurately identify the oil and gas bearing layers under the complex geologic conditions.Therefore,on the basis of knowing the local well logging data, coring data, oil test data and the regional geologic characteristics,we should first select practical logging datum for establishing oil and gas bearing layers interpretation standard.After the logging data correction, we can draw crossplots of the standard,in which accuracy of the standard is very closely correlated with reliability and representativity of the datum used.This method has been better used in the Pucheng Oilfield,and offers reference for other oilfields to identify oil and gas layers.
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