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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2014-06
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Tight sandstone gas accumulation pattern in Upper Triassic Xujiahe Formation of Sichuan Basin,China

HE Man-ru;CHEN Fei;XU Guo-sheng;YUAN Hai-feng;State Key Laboratory of Gas Reservoir Geology and Exploration,Chengdu University of Technology;  
The paper discusses the tight sandstone gas reservoir accumulation mode,the main controlling factors and the gas accumulation pattern in the Upper Triassic Xujiahe Formation(T3x)of Sichuan basin,aiming to predict the natural gas gathering areas and pointing out the next step prospecting direction.Tight gas reservoirs are characterized by deep burial depth,poor reservoir property and low production rate,but have large exploration potentials.The natural gas explored and discovered from the Xujiahe Formation in Sichuan Basin mainly concentrates in Member 2,4and 6of Xujiahe Formation.The gas reservoirs are characterized by low degree of fullness,high water saturation in lower positions,low level of produced reserves,and limited gas-bearing range of the reservoirs.The comparison of the Xujiahe Formation source rocks and the natural gas light hydrocarbon and the research of the natural gas accumulation combination indicate that the hydrocarbon accumulation pattern is characterized by multiple hydrocarbon supplies,accumulation near the source,lithology reservoirs,oil-gas conversion and later adjustment.The main controlling factors of the natural gas enrichment in Xujiahe Formation are that the Triassic hydrocarbon sources distribution controls the source and the adequacy of natural gas,the structural strength controls the development and distribution area of the traps,and the favorable sedimentary facies belt and diagenetic facies belt control the gathering place and scale of natural gas.Natural gas mainly assembles in the tectonic uplift lower area,the moderate faulting area and the developmental reservoir area.
【Fund】: 国家自然科学基金资助项目(41372141);; 国家科技重大专项(2008ZX05001-05-01)
【CateGory Index】: P618.13
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