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Controlling factors of marine shale gas differential enrichment in southern China

Petroleum Exploration and Development 2020年第3期47卷 661-673页

作者： JIANG Zhenxue SONG Yan TANG Xianglu LI Zhuo WANG Xingmeng WANG Guozhen XUE Zixin LI Xin ZHANG Kun CHANG Jiaqi QIU Hengyuan State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum(Beijing)Beijing 102249China Unconventional Oil and Gas Science and Technology Research Institute China University of Petroleum(Beijing)Beijing 102249China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China

Based on the exploration and development practice of marine shale gas in Fuling, Weiyuan, Changning, Luzhou and Southeast Chongqing in southern China, combined with experiments and analysis, six factors controlling differential enrichment of marine shale gas are summarized as follows:(1) The more appropriate thermal evolution and the higher the abundance of organic matter, the higher the adsorption and total gas content of shale will be.(2) Kerogen pyrolysis and liquid hydrocarbon cracking provide most of the marine shale gas.(3) The specific surface area and pore volume of organic matter rich shale increased first and then decreased with the increase of thermal evolution degree of organic shale. At Ro between 2.23% and 3.33%, the shale reservoirs are mainly oil-wet, which is conducive to the enrichment of shale gas.(4) The thicker the roof and floor, the higher the shale gas content. The longer the last tectonic uplift time and the greater the uplift amplitude, the greater the loss of shale gas will be.(5) The buried depth and dip angle of the stratum have different controlling and coupling effects on shale gas in different tectonic positions, resulting in two differential enrichment models of shale gas.(6) The effective and comprehensive matching of source, reservoir and preservation conditions determines the quality of shale gas accumulation. Good match of effective gas generating amount and time, moderate pore evolution and good preservation conditions in space and time is essential for the enrichment of shale gas.

关键词： southern China shale gas differential enrichment main controlling factors factors matching accumulation effect

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