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从沉积学及储层岩石学特征入手,结合常规岩石薄片、铸体薄片、扫描电镜、孔渗分析、压汞实验分析结果,对鄂尔多斯盆地东南部石盒子组盒8段储层特征及影响因素进行研究。结果表明,该套储层为低孔隙、低渗透率储层,具有排驱压力高、孔喉半径小、孔喉分选性差的特征。储集孔隙类型以残余粒间孔、粒内溶蚀孔为主,晶间孔、微裂隙较少。压实作用、硅质胶结、自身黏土矿物胶结、碳酸盐矿物胶结以及石英的次生加大是导致储层致密的主要因素,而长石、岩屑等的溶蚀作用使储层物性得到改善,微裂缝对储层的储集性影响不大。
Based on the characteristics of sedimentology and reservoir petrology, combining with the results of conventional rock slice, cast slice, scanning electron microscopy, pore permeability analysis and mercury intrusion test, the reservoir characteristics and influential factors of Box 8 reservoir in southeastern Ordos Basin research. The results show that the reservoirs are low porosity and low permeability reservoirs, which have the characteristics of high displacement pressure, small pore throat radius and poor pore throat separation. The types of reservoir pores are mainly residual intergranular pores and intragranular dissolution pores with fewer intergranular pores and fewer micro-cracks. Compaction, siliceous cementation, self-clay mineral cementation, carbonate mineral cementation, and quartz secondary growth are the major contributors to the densification of reservoirs, and the dissolution of feldspars, cuttings and the like improves reservoir physical properties , Microcracks have little effect on the reservoir’s reservoir.