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根据川东寨沟湾构造嘉二段地层钻井岩心的宏观及微观特征,结合常规孔、渗资料对其储层特征进行了较为深入的研究。结果表明:该套地层的储集岩岩性以晶粒白云岩为主,其次为颗粒白云岩;储集空间以次生成因的晶间孔、晶间溶孔为主;储集性能总体较差,多属于裂缝-孔隙型和孔隙-裂缝型储层;储层纵向上主要发育于嘉二2亚段,嘉二1亚段较少,嘉二3亚段部分含有储层;横向上,嘉二2亚段以寨沟2井和寨沟4井储层最为发育,嘉二1亚段以寨沟4井储层发育最好。此外,沉积作用不仅控制着储集岩体的发育和分布,还影响着储层的基本形态和经历的成岩作用类型及强度,是控制储层发育的主导因素;而成岩作用决定了储层内部储集空间的特征和储集性能,直接影响储集岩孔隙空间的形成和演化;构造作用则为以上作用提供了条件。
According to the macroscopic and microscopic features of the drilling core of the Jia 2 member in the Qiaogou Bay structure, East Sichuan Basin, combining with the conventional hole and permeability data, the reservoir characteristics are studied in more depth. The results show that the lithology of reservoir rocks in this set of strata is dominated by crystalline dolomite, followed by particulate dolomite; intergranular pores and intergranular dissolved pores in secondary reservoir space are the main reservoirs; Most of the reservoirs are mainly fractured-pore type and pore-fractured reservoirs. The reservoir mainly develops longitudinally in Jia 2 nd 2 segment and Jia 2 sub-segment 1, while Jia 2 3 sub-segment contains reservoirs. Laterally, Jia 2 sub-paragraph to Zhaigou 2 well and Zhaogou 4 well most developed reservoirs, Jia 2 1 sub-section to Zhaigou 4 well reservoir development best. In addition, sedimentation not only controls the development and distribution of reservoir rocks, but also influences the basic shape of reservoir and the type and intensity of diagenesis experienced, which is the dominant factor controlling reservoir development. Diagenesis determines the reservoir interior The characteristics of reservoir space and reservoir performance have a direct impact on the formation and evolution of pore space in the reservoir rocks. The tectonic action provides the conditions for the above actions.