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《Geoscience》 2018-01
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Subnormal Pressure Characteristics and Genesis Analysis of the Central Uplift Belt in Huimin Sag

LIU Yuanqing;ZHOU Le;ZENG Jianhui;LI Wei;ZHOU Junliang;HE Jin;WANG Xinfeng;Lü Lin;DENG Qijun;Centre for Hydrogeology and Environmental Geology,CGS;College of Geosciences,China University of Petroleum;Bohai Oilfield Research Institute,Tianjin Branch,CNOOC Ltd.;  
There commonly developed subnormal pressure in Huimin Sag,which mainly located in the second and third members of Shahejie Formation vertically and around the Central Uplift Belt horizontally. The previous studies on genesis of subnormal pressure has still remained un-quantitative. Based on the measured data of 295 boreholes,the vertical and horizontal distribution characteristics of the strata pressure in Huimin Sag were discussed. Furthermore,the decrease of pressure caused by the influence of the strata denudation,temperature decrease,water consumption of mineral alteration and volume change of minerals was analyzed quantitatively,which was respectively 0. 516 MPa,2. 02 to 3. 73 MPa,8. 64 MPa and 4. 36 MPa. Hydrocarbon filling led the pressure increased less than 32 MPa. All the above factors together made that the pressure evolution of Central Uplift Belt presented the cycle of depressurization-pressurization-depressurization,and finally formed the currentdistribution characteristics of pressure.
【Fund】: 国家科技重大专项(2011ZX05006-001);; 中国地质调查局地质调查项目(DD20160289;DD20179262);; 山东省自然科学基金项目(ZR2016DB29)
【CateGory Index】: P618.13
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