Accumulation of Water-Soluble Gas by Degasification: One of Important Mechanisms of Large Gas Accumulations in the Xujiahe Formation, Sichuan Basin

详细信息   

• 责任者：Li Wei (State Key Laboratory of Enhanced Oil Recovery ; Beijing 100083 ; China) ; Qin Shengfei
• 刊名：Petroleum Exploration and Development
• 出版年：2011
• 卷期：38(6)
• 关键词：水溶气 ; water dissolved gas ; 天然气 ; natural gas ; 成藏模式 ; pool-formed model ; 四川盆地 ; Sichuan Basin
• 页码：p.662-670
• 图表：6 illus., 36 refs.
• 分类号：1003
• issnNo：ISSN1000-0747
• isbnNo：CN11-2360/TE

摘要

In this paper, the authors studied the properties and characteristics of the fluid,and found the changes of natural gas components and carbon isotope which confirm the accumulation of water-soluble gas by degasification,namely,such accumulation far away from gas source features high methane,high drying factor,high ratio of isoalkane to normal paraffin hydrocarbons,and heavy carbon isotope in methane and ethane. The authors conclude that the accumulation of water-soluble gas by degasification is not only one of the important mechanisms of development of large lithologic gas reservoirs and large gas accumulations in Central Sichuan,but also a key reason for poor source rocks in the Xu1 Member but large gas accumulation in the Xu2 Member in the Hechuan-Anyue area.