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《Journal of Northeast Petroleum University》 2015-05
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Analysis of the causes of formation overpressures in the Chezhen sag of Bohai bay basin

JIN Qiuyue;GAN Jun;LU Mei;HE Sheng;SUN Shengxin;WANG Jing;GAO Yujie;Zhanjiang Branch,CNOOC Limited;CNOOC EnerTech-Drilling & Production Company CNOOC Central Laboratory;Faculty of Earth Resources,China University of Geoscience;  
Through statistically measured formation pressure data in chezhen sag of Bohai bay basin,we made a research into the characteristics of abnormal formation pressure.The results show that abnormal high pressure develops in the 3rd and 4th member of Shahejie formation.The coefficient of pressure ranges from 1.20 to 1.78.Overpressure is mainly distributed in the center of the sub-sag area.The depth of top seal appears under 2 100 m,mainly distributes in the 3rd and 4th member of Shahejie formation.By logging curve characteristics of mudstone,hydrocarbon source rock evolution simulation,inclusion homogenization temperature measurement and PVT simulations restore the minimum captured pressure show that:Appears some regularity in overpressure zone,acoustic time significantly deviates from the normal compaction trend,with high acoustic time value,the density conforms to the normal compaction regularity.In the two stages of oil and gas filling period,hydrocarbon source rock generate a large amount of hydrocarbon fluid,with the second stage is the mainly hydrocarbon generation and expulsion period,conform to the formation fluid overpressure stage.The first stage of the inclusions are captured in normal pressure environment,the second stage of the inclusions are captured mainly under overpressure environment.Comprehensive analysis of the 3rd and 4th member of Shahejie formation fluid overpressure is mainly caused by hydrocarbon generation.
【Fund】: 国家科技重大专项(2011ZX05006-002)
【CateGory Index】: P618.13
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