The formation and destroyment mechanism of shale gas overpressure and its main controlling factors in Silurian of Sichuan Basin

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  • 1.Research Institute of Petroleum Exploration and Production,SINOPEC,Beijing 100083,China;2.State Key Laboratory of Shale Oil and Gas Accumulation Mechanism and the Effective Development,Beijing 100083,China

Received date: 2015-09-30

  Revised date: 2015-12-03

  Online published: 2019-09-20

Abstract

Shale gas Well JY1 and Well PY1 eastern Sichuan Basin have been taken as examples to study the overpressure evolution in shale gas.The log intersection diagram between interval transit time and density has been used to distinguish the mechanic of overpressure. Fluid inclusion and PVTsim software have been used to recover the pressure evolution in the process of hydrocarbon generation and tectonic erosion.According to the research of fracture,time of uplift and times of tectonic deformation,the controlling factors on the evolution of shale gas overpressure have been discussed.The conclusion can be drawn that the mechanic of shale gas overpressure in Silurian is fluid expansion,which is caused by hydrocarbon generation.The fluid pressure decreased in the uplift process since Yanshanian generally.However,due to low porosity rebound ratio,poor pore connectivity and low formation water content,the decrement of fluid pressure cannot offset the effect of erosion,which caused the increasing of fluid pressure coefficient in the uplifting process.Well PY1 has been experienced three-period tectonic deformation since Yanshanian and its initial uplift time was 130Ma.In contrast,Well JY1 area has been experienced weaker tectonic deformation,and its initial uplift was 90Ma.As a result,low angel fractures and little high resistance fractures developed in Well JY1,high angle fractures and lots of high resistance fractures developed in Well PY1.It can be said that the development degree of high angel crack,time of uplifting and superposition of stress field are main reasons to affect the preservation of shale gas overpressure.

Cite this article

Li Shuang-jian, Yuan Yu-song, Sun Wei, Sun Dong-sheng, Jin Zhi-jun . The formation and destroyment mechanism of shale gas overpressure and its main controlling factors in Silurian of Sichuan Basin[J]. Natural Gas Geoscience, 2016 , 27(5) : 924 -931 . DOI: 10.11764/j.issn.1672-1926.2016.05.0924

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