Wireline log response-based recognition and evaluation of diagenetic facies in tight sandstone reservoirs: A case study of the Member 3 of Paleogene Shahejie Formation in Raoyang sag of Jizhong Depression
Zhang Kaixun1, Bai Guoping1, 2, Wang Quan3, Niu Xinjie3, Li Qiuwei1, Lu Xiaoxin4
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 3 PetroChina Huabei Company,Renqiu 062552,Hebei; 4 SINOCHEM Petroluem Exploration and Production Co.,Ltd., Beijing 100031;
Abstract：Based on the observation of bore cores and thin sections, combined with well logging and drilling data,this study documents the characteristics of diagenesis and diagenetic facies of the tight sandstones in the Member 3 of Paleogene Shahejie Formation in Raoyang sag of Jizhong Depression. The sandstones have undergone compaction,cementation,dissolution and fracturing,and they are at the phase A of the intermediate diagenetic stage. Five types of diagenetic facies are recognized on the basis of the type and intensity of diagenesis and diagenetic minerals. They are tightly compacted,clay mineral pore-filling,carbonate cemented,unstable components dissolved and moderately compacted-weakly cemented diagenetic facies. The sonic,gamma ray logs and resistivity,which are sensitive to diagenetic facies,were selected to establish the logging criteria by calibrating cores with logging curves. With the criteria,subdivision and recognition of diagenetic facies were carried out for individual wells,and then the distribution pattern of diagenetic facies in individual wells was figured out. The identified diagenetic facies match with the results of oil testing and petro-physical analysis. A sophisticated approach of diagenetic facies is an important method for predicting sweat spots of tight sand reservoirs.
Zhang Kaixun,Bai Guoping,Wang Quan et al. Wireline log response-based recognition and evaluation of diagenetic facies in tight sandstone reservoirs: A case study of the Member 3 of Paleogene Shahejie Formation in Raoyang sag of Jizhong Depression[J]. JOPC, 2016, 18(6): 921-938.
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