川东南坳褶带清虚洞组优质储层发育主控因素分析

川东南坳褶带寒武系清虚洞组碳酸盐岩储层的发育受三大主控因素控制:高能浅滩沉积环境、白云岩化作用和埋藏溶蚀作用。高能浅滩有利于保存原生孔隙和发生早期溶蚀作用,为储层的发育提供物质基础;白云岩化作用改造储集空间、提供流体活动空间,是储层形成的必要补充;埋藏溶蚀作用造就储集空间,改善渗流通道,是储层形成的关键因素。三大主控因素紧密联系、缺一不可,形成了清虚洞组粒屑白云岩优质储层。

Major Controlling Factors of Cambrian Qingxudong Formation High-quality Reservoir in Downwarp-fold Belt of Southeast Sichuan Basin

Three major controlling factors of Cambrian Qingxudong Formation carbonate reservoir formation in the downwarp-fold belt in southeast Sichuan basin are high-energy shoal,dolomitization and burial dissolution.The high-energy shoal is conducive to preservation of primary porosity and reformation of early dissolution.The dolomitization reforms the reservoir space for hydrocarbon accumulation and provides the space for fluid activity.The burial dissolution creates the reservoir space and improves filtration channel.Three factors are associated and indispensable to form the high quality granular dolomite reservoir in Cambrian Qingxudong Formation.