致密砂岩微观孔隙特征及分类

摘要

研究了苏里格西区致密砂岩孔隙特征。铸体薄片及扫描电镜表明，致密砂岩主要以溶孔和晶间孔为主；压汞资料表明，致密砂岩渗透率与排驱压力、主流喉道半径、最大孔喉半径的相关性较好，而与歪度、分选系数、退汞效率的相关性不好。根据研究结果对岩心分类，研究区以第三、第四类岩心为主。%Western Sulige tight sandstone porosity characteristics.Cast thin section and scanning electron microscopy showed that the tight sandstone mainly intergranular dissolution pores and pore-oriented ;mercury data indicate that permeability and tight sandstone expulsion pressure,a good correlation mainstream throat radius,maximum pore throat radius,with the skewness,sorting coefficient, the correlation between the efficiency of mercury withdrawal bad.Based on the results of the core classification,the study area with the third,fourth category cores based.