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目的:对陕北地区长8储层特征及其控制因素进行探讨和分析,考察其勘探开发潜力。方法:通过研究区大量岩石薄片、铸体薄片以及扫描电镜、压汞等分析资料,对长8储层的岩石学特征、孔隙类型以及孔喉结构进行了研究。分沉积作用、成岩作用对储层控制因素进行了分析。结果:长8储层主要以岩屑长石砂岩为主,长石岩屑砂岩次之,发育粒间孔和溶蚀孔两种主要孔隙类型。姬塬-安塞地区,盐定地区,环县-白豹地区沉积作用和成岩作用均有一定差异。
Objective: To explore and analyze the characteristics and controlling factors of Chang 8 reservoir in northern Shaanxi and investigate the potential of exploration and development. Methods: The petrological characteristics, pore types and pore-throat structure of Chang 8 reservoir were studied based on the analysis data of a large number of rock slices, cast thin sections, scanning electron microscopy and mercury intrusion in the study area. Sedimentary sedimentation, diagenesis of the reservoir control factors were analyzed. Results: The Chang 8 reservoir is dominated by lithic feldspar sandstone, followed by feldspathic lithic sandstone, with two major pore types of intergranular pores and dissolution pores. Sediment and diagenesis in Jiyuan - Ansai, Yanjing, Huanxian - Baibao areas are all different.