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《Journal of Chengdu University of Technology》 2002-02
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FORMATION MECHANISM OF GAS RESERVOIR IN THE UPPER TRIASSIC XUJIAHE FORMATION ALONG THE XIAOQUAN-FENGGU SAG BELT, WESTERN SICHUAN

WU Ge, LI Hua chang (Geological Synthetic Research Institute of Southwest Petroleum Bureau, Chengdu, China)  
It is confirmed that natural gas reservoired in the Xujiahe Formation in Peng County is of an irregular compact and condensed reservoir on the bassis of analyzing 2000 geological data and exposure situation of oil gas. All the data and materials are obtained from investigations on cores, and experiments on normal physical properties, intrusive mercury parameters, cast thin sections. This paper is concentrated on studying mechanics of oil gas formation, migration, accumulation, and preservation upon the conditions of reservation and trapping according to more complicated and disordered gas reservoirs. It indicates proposes that gas pools in the Xujiahe Formation are preserved in well migrated reservoirs with high and super pressures, in which quasi layered gas pools with a little irregularity under the condition of active formation water are developed in the lower Xujiahe Formation, and the regional non layered and limited quasi layered ones in the upper. As a whole, how the gas reservoirs are preserved is extremely depended on fractures, but the shape of the gas reservoir is independent on a structure belt and the gas content in the main reservoir is a positive correlation with the development of sand bodies.
【CateGory Index】: P618.13
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