摘要
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。
Abstract
The reservoir along Bin County and Xunyi County, which are on the southeast of Ordos Basin, is rarely explored by far. Although mesozoic oil-bearing formations are buried shallow and has great explorative potential, previous study on geological characteristic of this region is few. Therefore, this paper carries out a comprehensive research on petrologic characteristics,physical properties and pore texture of sandstone reservoir of Chang 8 formation. The result indicates that sandstone in this formation mainly are lithic arkoses and eldspathic litharenites which are with low compositional maturity and low textual maturity. During primary sed-imentary, physical properties are heavily affected by rock texture, thus, content of matrix has a slight influence on porosity and per-meability. The main destructive factors are compaction and cementation of clay mineral and carbonate, while dissolution, fractures and rim chlorite with enwrapped particle in early stage are constructive factors.
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