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通过大量的岩石薄片岩矿学鉴定、铸体薄片图象统计分析、扫描电镜观察以及压汞法获取的砂岩孔隙结构特征数据，进行储集层综合特征研究，找出储集层物性影响因素，以便为分析储集层潜在敏感性， 解释储集层敏感性评价实验结果提供依据． 结果表明：宋芳屯油田葡萄花油层呈现中孔、中～低渗特征， 主要由富长石砂岩组成， 不稳定骨架颗粒体积分数较高． 孔隙发育中等，平均面孔率为１１ ．５７ ％ ，次生孔隙是主要的储集空间． 储层平均孔喉半径 Ｒ Ｐ 较细，为２～６ μｍ ，主要渗流孔喉半径 Ｒ Ｆ 为２ ，６ 和８ μｍ ， Ｒ Ｐ 和 Ｒ Ｆ 与渗透率关系密切． 根据砂岩储集层物性特征与孔隙喉道类型及其发育程度的相互关系，划分为大孔隙－ 粗喉道、较大孔隙－ 细喉道、较小孔隙－ 较细喉道、小孔隙－ 细喉道等４ 种孔隙喉道配置关系． 砂岩的含油饱和度和水驱油效果受控于平均孔喉直径比和孔隙均质因数． 根据１０ 项敏感参数特征，将储层划分为Ⅰ类、Ⅱ类和Ⅲ类等３ 种类型，其分布受控于三角洲相带内的砂体展布特征．
Based on a large number of lithofacies mineralogical identification, statistic analysis of casting thin film images, scanning electron microscope observation and pore structure characteristic data of sandstone obtained by mercury intrusion method, comprehensive characteristics of reservoir were studied to find out the influencing factors of reservoir physical property, In order to provide a basis for analyzing the potential sensitivity of reservoir and interpreting the results of reservoir sensitivity evaluation experiment. The results show that the Putaohua oil layer in Songfangtun Oilfield is characterized by medium-porosity, medium-low permeability, and is mainly composed of euphratic sandstone with high volume fraction of unstable framework particles. The porosity is medium and the average face rate is 11. 57%, secondary porosity is the main storage space. The average pore throat radius, R P, is relatively small, ranging from 2 to 6 μm. The main seepage pore throat radiuses, R F, are 2, 6 and 8 μm. R P and R F are closely related to permeability. According to the correlation between physical properties of sandstone reservoirs and pore throat types and their development degree, they are divided into macropores - coarse throats, larger pores - fine throats, smaller pores - thin throats, small pores - fine Throat and other four types of pore throat configuration. Sandstone oil saturation and water flooding are controlled by the average pore throat diameter ratio and pore homogenization factor. According to the characteristics of 10 sensitive parameters, the reservoirs are divided into three types Ⅰ, Ⅱ and Ⅲ, whose distribution is controlled by the distribution of sand bodies in the delta facies.