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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。
Anatomical analysis and description of the three gas pools in Tongnan, Bajiaochang and Guang’an, representing the characteristics of the Xuer 2, Xu 4 and Xu 6 Member reservoirs, respectively, of the Upper Triassic Xujiahe Formation in central Sichuan area were carried out. The results show that the Upper Triassic Xujiahe Formation in the Central Sichuan Basin all formed near-source gas accumulation. The northern part is mainly composed of tectonic gas reservoirs and structural-lithologic gas reservoirs. In the central and southern parts, L with lithologic gas reservoirs and fractures - lithologic gas reservoirs. The western slope zone is dominated by fractured-lithologic gas reservoirs. The good source rock has laid the material foundation for the natural gas accumulation in near source. The existence of large-scale faults is the key factor to determine the preservation of natural gas. Paleo-structure, paleo-uplift and its slope are the favorable points for the migration of natural gas. This study provides a theoretical basis for the exploration of natural gas in the Upper Triassic Xujiahe Formation in central Sichuan.