地质概况及“排水找气”的阶段划分川南气区属川南低陡褶带 ,位于四川盆地川东高褶带以西、华蓥山深断褶带向西南呈扇形展布的中—低缓型构造群 ,其西北以华蓥山深大断裂为界 ,呈三角形区块。沉积盖层从震旦系到侏罗系、白垩系 ,厚约 6 0 0 0～ 70 0 0ｍ。主要产气层为二、三叠 Geological Overview and “Drainage Looking for Gas” Stage Division South Sichuan gas field is a low-steep fold in the southern Sichuan Basin, located in the Sichuan Basin, east of the Sichuan Basin, west of the fold, Huayingshan deep fault fold fanned to the southwest fan-shaped low-moderate structure Group, its northwest Huayingshan deep fault as the boundary, was triangular blocks. Sedimentary caprock from Sinian to Jurassic, Cretaceous, thickness of about 6000 ~ 7000m. The main gas production layer is two or three stacked