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《Natural Gas Industry》 2008-02
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GEOLOGICAL CONDITION OF SHALE GAS ACCUMULATION IN SICHUAN BASIN

ZHANG Jin-chuan, NIE Hai-kuan, XU Bo, JIANG Sheng-ling, ZHANG Pei-xian, WANG Zong-yu (China University of Geosciences·Beijing).  
Distinguished by what from traditional conception of fissured shale gas, shale gas is concerned to the gas accumulated within the shales and/or mudstones by free and adsorbed gas. The Sichuan Basin experienced complex tectonic movements in process of the evolution from Craton basin to foreland basin. As a result, The Sichuan Basin is of the similar tectonic characteristics and geological conditions for shale gas with the typical shale gas basins in America, where the Paleozoic shale is not only the source rocks for conventional gas reservoirs but also the main objects for shale gas accumulation and exploration. At present, a large number of evidences of shale gas have been found in the Sichuan Basin. According to the structural and evolutional characteristics of the Sichuan Basin, the unconventional gas is distributed by two distinguished patterns: in place, shale gas is mainly in the southeastern basin while the source-contacting gas in the northwestern basin; in time, shale gas accumulated in the Paleozoic Erathem while source-contacting gas in the Mesozoic Erathem. In North and South Sichuan Basin, including Southwestern Sichuan Basin, there developed Paleozoic Erathem gas bearing shales with huge thickness, high contents of organic matters and shallow buried depths. Lower Cambrian and Lower Silurian Series are of good geological conditions for shale gas accumulation and exploration. In Central Sichuan Basin there developed both Mesozoic and Paleozoic Erathems of source rocks, in which Upper Triassic Series is the favorable horizon for shale gas exploration. In West Sichuan Basin the gas bearing shales is mainly Mesozoic Erathem, in which shales and tight sands interbed frequently to form the source-contacting gas with the characteristics of gas accumulated on the bottom of tight sands. There exist perspective conditions for exploration and exploitation of shale gas in West Sichuan Basin, especially the high carbon shales and/or mudstones with relatively shallower depths.
【Fund】: 国家自然科学基金项目(编号:40672087、40472073)的资助
【CateGory Index】: P618.13
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