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鄂尔多斯盆地东南部的彬县-旬邑地区勘探程度相对较低,中生界油层埋藏浅,勘探潜力较大,基础地质研究薄弱。利用岩心、测井和多种分析测试资料,对长8砂岩储层岩石学、储集物性及孔隙结构等特征进行系统综合研究。结果表明:长8储层岩性主要为岩屑长石砂岩、长石岩屑砂岩,具有成分成熟度、结构成熟度较低的特点;原始沉积时的岩石结构控制了岩石原始的沉积物性,杂基含量对孔渗的影响不大;对长8储层起破坏作用的因素主要有:压实作用、粘土矿物胶结、碳酸盐胶结。起建设作用的因素主要为:早期包裹颗粒的环边绿泥石、溶蚀作用及裂缝。
The exploration in Binxian-Xunyi area in the southeast part of Ordos Basin is relatively low, the Mesozoic reservoir is buried shallow, exploration potential is great, and basic geology research is weak. Based on the core, logging data and many kinds of analysis and test data, the paper systematically studied the petrology, reservoir properties and pore structure of Chang 8 sandstone reservoir. The results show that the lithology of Chang 8 reservoir mainly consists of feldspathic feldspar sandstone and feldspathic lithic sandstone with characteristics of composition maturity and low structural maturity. The original sedimentary rock structure controls the original sedimentary properties of the rock, The content of miscellaneous groups has little effect on the porosity and permeability; the main factors that can damage the Chang 8 reservoir include compaction, clay mineralization and carbonate cementation. The major factors that play a role in the construction are the chlorite, the dissolution and the fractures of the enveloping particles in the early stage.