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四川盆地下二叠统灰岩储层中，较大储量缝洞系统以东吴期暴露溶蚀形成的管道状溶洞系统为主要储集空间。第三纪喜山运动产生构造裂缝，使致密灰岩具有较高渗滤能力，但在深埋条件下不具备产生较强岩溶作用形成大型溶洞的条件。缝洞系统是在东吴期古溶洞系统基础上，经埋藏后充填和溶解，最后由喜山期构造裂缝改造而成。储层地质模式可描述为东吴期管道状溶洞系统与喜山期构造裂缝网络的组合。在东吴期古岩溶发育区，单斜或向斜区同样存在有待于进一步钻探的缝洞系统
Among the lower Permian limestone reservoirs in the Sichuan Basin, the larger reservoir-cavern system is dominated by the tunnel-like cave system formed by the exposure and erosion of the Soochow period. The Tertiary Himalayan movement resulted in tectonic fractures, which made the tight limestone have high percolation capability. However, under the deep buried conditions, the conditions of strong karstification to form large caves were not available. The cave system is based on the ancient cave system during the Soochow period, filled and dissolved after being buried, and finally transformed from the structural fracture of the Himalayan period. The reservoir geological model can be described as a combination of the tunnel-like karst system in Soochow with the structural fracture network in the Himalayan period. In the Soochow Paleo-karst development zone, there are also similar cave-hole systems to be further drilled in the monocline or syncline area