中文摘要：

通过普通及铸体薄片、扫描电镜、岩心物性及压汞数据等资料，研究了川南地区须家河组致密砂岩储层的孔隙类型和物性特征，并探讨了孔隙发育类型、孔-渗关系控制因素及砂岩物性空间变化与沉积条件的关系。结果表明，川南地区须家河组以原生粒间孔发育为特征，次为溶蚀孔隙和晶间微孔，渗透率随孔隙度增加呈迅速增加-稳定-再次增加的三段式分布，主要原因是绿泥石、伊利石胶结物的生长抵消了孔隙度增加对渗透率的贡献。平面上，砂岩物性的变化与沉积条件密切相关：短距离搬运或沉积水动力弱的砂岩成分及结构成熟度差，物性差；长距离搬运且沉积于强水动力条件的砂体孔隙发育。纵向上，单一河道砂体的中-中下部物性好于顶、底部，原因是河道沉积时水动力由强变弱，砂体中部成分、结构成熟度好于顶、底部，这也导致了砂体内部成岩作用的非均质性，并最终影响了孔隙的纵向分布。

英文摘要：

Based on thin sections,scanning electron microscopy（SEM）,core porosity and permeability data,and mercury injection data ,this paper summarized the pore types , physical property of tight sandstone of the Xujiahe Formation and discussed the controlling factors on pore types ,poroperm relationship and spatial change of physical property .The result shows that the rapid compaction process and minor dissolution resulted in the relative abundant of primary pore followed by dissolution pore and intergrannular micropore .As the porosity increases ,the permeability change shows a three-stage pattern ,namely rapid increasing first ,then getting stabilized and increasing again .This distribution pattern is mainly con-trolled by pore throat filling authigenic chlorite and illite which offset the increases in permeability due to the increase of porosity .The poor connectivity of dissolution pore and micropore also influence the permeability of sandstone .The spatial change of physical property of sandstone is controlled by sedimentary condition .The relative short transport distance or low energy environment resulted in low compositional and textural maturity and poor physical property .Only the sandstone with long transport distance and high energy environment are abundant in porosity .The physical quality in middle and lower part of single fluvial sandstone is better than that of the upper and bottom parts .The major reason is that the decrea-ses of energy during fluvial sandstone deposition result in higher compositional and textural maturity of the middle part and lead to the diagenetic heterogeneity within a single sandstone .