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《Natural Gas Industry》 2016-01
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Geochemical evidence of water-soluble gas accumulation in the Weiyuan Gas Field,Sichuan Basin

Qin Shengfei;Zhou Guoxiao;Li Wei;Hou Yaohua;L Fang;PetroChina Research Institute of Petroleum Exploration and Development;China University of Mining and Technology;  
At present,there are several different opinions on the formation process of the Weiyuan Gas Field in the Sichuan Basin and the source of its natural gas.In view of the fact that the methane carbon isotope of the natural gas in the Weiyuan Gas Field is abnormally heavy,the geologic characteristics of gas reservoirs and the geochemical characteristics of natural gas were first analyzed.In the Weiyuan Gas Field,the principal gas reservoirs belong to Sinian Dengying Formation.The natural gas is mainly composed of methane,with slight ethane and trace propane.The gas reservoirs are higher in water saturation,with well preserved primary water.Then,it was discriminated from the relationship of H_2S content vs.methane carbon isotope that the heavier methane carbon isotope of natural gas in this area is not caused by thermochemical sulphate reduction(TSR).Based on the comparison of methane carbon isotope in this area with that in adjacent areas,and combined with the tectonic evolution background,it is regarded that the natural gas in the Weiyuan Gas Field is mainly derived from water-soluble gas rather than be migrated laterally from adjacent areas.Some conclusions are made.First,since methane released from water is carbon isotopically heavier,the water-soluble gas accumulation after degasification results in the heavy methane carbon isotope of the gas produced from the Weiyuan Gas Field.Second,along with Himalayan movement,great uplift occurred in the Weiyuan area and structural traps were formed.Under high temperature and high pressure,the gas dissolved in water experienced decompression precipitation,and the released natural gas accumulated in traps,consequently leading to the formation of the Weiyuan Gas Field.Third,based on calculation,the amount of natural gas released from water which is entrapped in the Weiyuan Gas Field after the tectonic uplift is basically equal to the proved reserves of this field,confirming the opinion of water-soluble gas accumulation after degasification.
【Fund】: 国家自然科学基金项目(编号:41372150);; 中国石油天然气股份有限公司科技项目(编号:2014B-0608);中国石油天然气股份有限公司重大专项(编号:2014E-3201);; 中国石油勘探开发研究院科技创新项目(编号:2012Y-001)
【CateGory Index】: P618.13
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