川中地区上三叠统须家河组典型气藏解剖与天然气成藏主控因素分析

对分别代表川中地区上三叠统须家河组须二段、须四段和须六段气藏特征的潼南、八角场和广安3 个气藏进行了解剖分析与描述。结果表明：川中地区上三叠统须家河组天然气均系近源成藏，北部以构造气藏和构造－岩性气藏为主；中部和南部受古残丘、古盐体底辟拱升的影响，以岩性气藏和裂缝－岩性气藏为主；西部斜坡带以裂缝－岩性气藏为主。良好的烃源岩为天然气近源成藏奠定了物质基础，大规模断层的存在是决定天然气保存的关键因素，古构造、古隆起及其斜坡部位是天然气运移的有利指向区。该研究为川中地区上三叠统须家河组天然气勘探工作提供了理论依据。

Typical gas reservoirs and main controlling factors of reservoir-forming of Upper Triassic Xujiahe Formation in central Sichuan Basin

Tongnan, Bajiaochang and Guang＇an gas reservoirs are analyzed, which respectively represents the natural gas reservoir characteristics of the second, the fourth and the sixth member of Upper Triassic Xujiahe Formation in central Sichuan Basin. The research indicates that the gas reservoir-forming is characterized by short distance migration and accumulation of hydrocarbons in this area. The types of gas reservoirs in northern part are structural and strnctural-lithologic gas reservoirs, in central and southern part are lithologic and fractural-lithologic gas reservoirs caused by the distribution of ancient monadnoek and palaeohigh, and in the western slope is mainly fractural-lithologic gas reservoir. Good source rocks provide enough hydrocarbons for gas reservoirs forming by means of distance migration and accumulation, large faults are the key factors for natural gas preservation, and ancient monadnock, palaeohigh and slope are effective areas to accumulate natural gas. This research provides theoretical basis for gas reservoirs exploration in Xujiahe Formation in central Sichuan Basin.