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《Earth Science Frontiers》 2008-02
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Abnormal pressure in the source-contacting gas reservoir in western Sichuan basin

Zhang Jinchuan1,Liu Lifang2,Tang Xuan1,Zhang Jie3,Pu Jun4,Xue Hui3,Xu Bo11.School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China2.CNOOC Research Center,Beijing 100027,China3.Exploration and Production Research Institute,SINOPEC,Beijing 100083,China4.Zhongyuan Oil Field Branch Co.,SINOPEC,Puyang 457001,China  
The migration and accumulation of typical source-contacting gas that is also called basin-centered gas,follow the piston principle that generates super pressure essentially.In the tight reservoir,the formation water cannot exchange sufficiently,which makes the pressure in gas pools maintained longer than that in conventional reservoir pools when the pools is subject to uplift or subsidence.The western Sichuan depression is one of the depressions whose source contacting gases were studied earliest in China,where the regional hyper-pressure is the direct product and the sign of the accumulation of source-contacting gas.Besides the effect from the accumulation of source-contacting gas,the regional overpressure in the western Sichuan depression is related directly to the undercompaction and regionally tectonic uplift before or after the accumulation of source-contacting gas.Present regional overpressure in the western Sichuan depression comes from three phases of tectonic movements and three stages of generation of abnormal pressure owing to the preferable obturation of petroleum accumulation systems.The multiple stages and multiple causes of the pressure rising may be delineated as follows:the undercompaction and hydrocarbon generation before the late Jurassic;the gas generation and accumulation of source-contacting gas from the late Jurassic to the Eogene;and the regional uplift after the late Eogene.Indicated by section configuration and calculated emendation,the coefficient of abnormal pressure in the western Sichuan depression may be divided into the contribution mainly from regional uplift,which is some 1.42,and that mainly from the accumulation of source-contacting gas,which contributes most of the rest over-pressure.According to the isoline of the pressure coefficient that is 1.42,the distribution of source-contacting gas accumulations can be determined approximately.
【Fund】: 国家自然科学基金资助项目(40472073 40672087 40272062)
【CateGory Index】: P618.13
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