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通过岩心薄片鉴定、扫描电镜和物性等分析资料,对富县西部长2段储层岩石学特征、孔隙类型和物性特征等进行研究,分析影响储层储集性能的主要控制因素。研究表明:以三角洲前缘的水下分流河道沉积的长2储层具有较低的成分成熟度和较高的结构成熟度,是控制储层发育的沉积因素;孔隙类型以粒间孔、溶蚀孔、微孔隙和裂隙为主,次生溶孔和微裂隙的存在为储层提供了储集空间和渗流通道;本区的成岩阶段已进入晚成岩A期,主要的成岩作用有压实-压溶、碳酸盐岩充填和溶解作用,不同成岩阶段的成岩作用对储层物性的改造不同,因此也控制着储层的储集性能。
Based on the analysis of thin sections, scanning electron microscopy and physical properties, the petrological characteristics, pore types and physical properties of the Chang 2 Member in western Fuxian are studied, and the main control factors affecting the reservoir performance are analyzed. The results show that the Chang 2 reservoirs deposited in the subaqueous distributary channel at the delta front have lower compositional maturity and higher structural maturity and are the depositional factors controlling reservoir development. The types of pores are intergranular pores, dissolution The pores, micropores and fissures are dominant. The existence of secondary dissolved pores and micro-fissures provides reservoirs and seepage channels. The diagenetic stage of this area has entered late-diagenetic stage A, and the major diagenesis is compaction- Pressure-dissolving, carbonate filling and dissolution. Diagenesis in different diagenetic stages can alter the physical properties of reservoirs and thus control the reservoir’s reservoir properties.