在岩心观察、铸体薄片鉴定的基础上,结合研究区大量岩心分析化验数据、测井处理数据、扫描电镜分析及毛管压力曲线等资料,论述了川西北九龙山地区上三叠统须家河组须二段砂岩的地层特征,储层的岩石学特征、物性特征及孔隙结构特征,成岩作用是影响工区储集砂岩储集性能的主要因素之一。结果表明,研究区须二段储层为致密性砂岩,呈低空低渗,孔隙间连通性差。 Based on the core observation and the identification of cast thin slices, and combining with a large number of core analysis and laboratory data, well logging data, scanning electron microscopy (SEM) and capillary pressure curves in the study area, the paper discusses the characteristics of the Upper Triassic Xujiahe The stratigraphic characteristics of sandstones of Group Xushan, petrological characteristics, petrophysical characteristics and pore structure of diagenesis are the main factors that influence the reservoir performance of reservoir sandstone in the work area. The results show that the second member of the Xujiahe Formation in the study area is tight sandstone with low permeability and low porosity and poor connectivity between pores.