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通过研究区内大量铸体薄片及物性资料分析,对鄂尔多斯盆地蟠龙探区长6油层组储层的孔隙类型、岩石学特征、孔渗特征及孔隙结构进行深入研究,分析储层储集性能的主要影响因素。结果表明,蟠龙探区长6储层整体具有成分成熟度偏低,结构成熟度较高的岩石学特点。长6储层岩性段主要为细粒和细-中粒长石砂岩、岩屑长石砂岩,小孔是主要的油气储集空间,细喉则是长6的基本渗流通道,为典型低孔、特低渗储集层。胶结类型以孔隙-薄膜式胶结为主,接触关系以线状为主,凹凸状接触也很普遍。长6储集层的物性主控因素主要包括:沉积微相、砂岩物质成分、压实和压溶作用、溶蚀作用及后期裂缝。其中储集砂体所处的沉积环境是影响该区储层物性最主要的因素。
Through the analysis of a large number of cast thin sections in the study area and the analysis of physical data, the pore types, petrological characteristics, pore-permeability characteristics and pore structure of reservoirs of Chang 6 reservoir in Beilong Exploration Area, Ordos Basin are studied in depth. The main factors. The results show that the Chang 6 reservoir in Beaulian exploration area has the characteristics of low maturity and high maturity. The lithology of the Chang 6 reservoir mainly consists of fine-grained feldspathic-fine-grained feldspar sandstone and lithic feldspathic sandstone. The small pores are the main oil and gas reservoir space while the thin throat is a long-6 basic seepage channel with a typical low Holes, ultra-low permeability reservoirs. The type of cementation is pore-film cementation, the contact is linear, and the bump-like contact is also common. The main controlling factors of Chang6 reservoir include sedimentary microfacies, sandstone composition, compaction and depressurization, dissolution and later cracks. The sedimentary environment in which the reservoir sand is located is the most important factor affecting the reservoir physical properties in this area.