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Main Mechanism for generating overpressure in the Paleogene Source Rock Series of the Chezhen Depression,Bohai Bay Basin, China

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Journal of Earth Science 2019年第4期30卷 775-787页

作者： Junli Zhang Sheng He Yuqin Wang Yongshi Wang Xuefeng Hao Shengyuan Luo Ping Li Xuewei Dang Ruizhi Yang Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan 430074China Research Institute of Exploration and Development Shengli Oilfield CompanySINOPECDongying 257000China Wuhan Center of China Geological Survey Wuhan 430205China Wuhan Zondy Cyber-Tech Co. Ltd. Wuhan 430074China

The Chezhen depression,located in the south of Bohai Bay Basin,is an oil-producing basin in China. The third and fourth members of the Shahejie Formation(E(s3) and E(s4)) are the main source rock series in the Chezhen depression. Widespread overpressures occurred in the E(s3) and E(s4) from the depths of approximately 2 000 to 4 600 m,with the maximum pressure coefficient of 1.98 from drillstem tests(DST). Among the sonic,resistivity and density logs,sonic-log is the only reliable pressure indicator and can be used to predict the pore pressure with Eaton's method. All the overpressured mudstones in the source rock series have higher acoustic traveltimes compared with normally pressured mudstones at a given depth. The overpressured mudstones in the E(s3) and E(s4) units are characterized by a normal geothermal gradient,high average density values up to 2.5 g/cm^3,strong present-day hydrocarbon generation capability,abundant mature organic matter and high contents of residual hydrocarbons estimated by the Rock-Eval S1 values and chloroform-soluble bitumen "A" values. All suggest that the dominant mechanism for overpressure in the mudstones of source rock series in the Chezhen depression is hydrocarbon generation. A comparison between the matrix porosity of the normally pressured sandstones and overpressured sandstones,the quantitative evaluation of porosity loss caused by compaction and the conventional thin section inspection demonstrate that the sandstones in the Chezhen depression were normally compacted. The high contents of hydrocarbons in the overpressured reservoirs prove that the overpressure in the sandstones of the source rock series was caused by pressure transmission from the source rocks.

关键词： overpressure-generating mechanism source rock series Es3 and Es4 formations Chezhen depression

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