川东地区黄草峡构造嘉陵江组嘉二段储层特征及主控因素

Characteristics and Controlling Factors of Second Member of Jialingjiang Formation Reservoir in the Huangcaoxia Structure of East Sichuan

摘要: 嘉二段是川东地区嘉陵江组主要储层发育段和含气层段，而黄草峡构造是主要的有利储层发育区之一，对其储层研究对该地区勘探开发具有重要的指导意义。通过岩心、薄片、测井资料的综合分析，认为川东地区黄草峡构造嘉二段主要储集岩为颗粒云岩和晶粒云岩，储集空间主要为粒内溶孔、晶间孔、晶间溶孔和构造缝、压溶缝；储层主要发育在嘉二2亚段，储集类型属裂缝–孔隙型。其储层发育受控于沉积相带分布、成岩作用类型和构造改造，其中云坪和鲕滩微相为有利储集相带，云化作用和溶蚀作用有利形成大量孔隙空间，构造的改造增大储层的渗透性有利高质量储层的形成。

Abstract: The Jia-2 member is the main reservoir and gas-bearing interval of Jialingjiang formation in the Northeastern Sichuan area. Research on the reservoir has guiding significance to exploration and developing of this area, since Huangcaoxia structure is one of the main favorable areas. Based on the analysis of core, thin section and well logging data, second member of Jialingjiang Formation in Huangcaoxia structures of East Sichuan is identified as different types of dolostone reservoirs, which mainly develop in the subsection of . The reservoir type is defined as fracture-pore type, and the main reservoir spaces are intergranular denudation pore, intercrystalline pore, intercrystalline denudation pore, tectonic fractures and pressolutional fractures. The reservoir is controlled and influenced by sedimentary facies, diagenesis and tectonic factor. The dolomite flat and Oolite bank microfacies are the best reservoir facies belt. Dolomitization and denudation can help to form many pore spacies, and permeability of the reservoir can be enlarged by tectonic factor. These contribute to form a high quality reservoir.