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Study on evaluation method of water flooded layer in Chaoyanggou Oilfield

YUE Xing-ju,MA De-hua,YANG Jing-bo (Mud Logging Company of Daqing Oilfield Company Ltd.,Daqing 163411,China)  
Chaoyanggou Oilfield in peripheral area of Daqing has low permeable lithologic and lithologic-structural reservoirs.Controlled by lithology,sedimentary micro-facies,micro-structure and faults,it has complex oil-water relation.Meanwhile,water injection development causes water flooding mechanism and water flooding performance become more complex,and interpretation of water flooded layer become more difficult.This paper proposes a method for interpreting and evaluating low permeable water flooded layer in Chaoyanggou Oilfield based on data analyzed from sealed coring well and sidewall coring of production in this area.It mainly uses new techniques including pyrolysis of sidewall coring,chromatographic analysis of alkane,and fluorescent micro-image analysis.It gives new methods including chart method,spectrum method and image method.This method is used in 47 wells in Chaoyanggou Oilfield with coincidence rate of comprehensive interpretation up to 83.1%,providing reliable geological evidence for determining perforation horizon and designing comprehensive adjustment plan in infilling area.
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