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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,对陕北斜坡东部上古生界盒8段储层特征及控制因素进行研究。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。储集孔隙类型主要为残余粒间孔和粒内溶蚀孔,存在少量的晶间孔和微裂隙。沉积作用是控制储层物性的决定性因素,其主要表现在沉积相带、碎屑成分、粒径大小3个方面;成岩作用是控制储层物性的主要原因,压实、胶结作用对物性起破坏作用,溶蚀作用对储层物性起改善作用。
Based on the characteristics of sedimentology and reservoir petrology, combining with the results of conventional rock thin slices, cast thin slices, scanning electron microscopy, pore permeability analysis and mercury intrusion experiments, the reservoir characteristics and controlling factors of the Upper Paleozoic in Block 8 of the eastern Shaanxi Slope 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 a few intergranular pores and micro-cracks. Deposition is the decisive factor controlling the physical property of reservoirs, which is mainly manifested in sedimentary facies belt, debris composition and particle size. Diagenesis is the main reason for controlling reservoir physical properties. Compaction and cementation destroy the physical properties The role of dissolution of the reservoir physical properties play a role in improving.