中文摘要：

东营凹陷南坡沙河街组沙三段（Es3）储层以低渗透率为显著特征，孔隙结构复杂使得岩电参数难以统一确定，给储层饱和度评价带来一定的困难。根据岩心物性、铸体薄片、压汞等分析资料，对艮；低渗透砂岩储层孔隙结构进行分析，将其细分为3个大类5个小类，进而结合岩电实验数据，提取出Es3。储层不同孔隙结构类型的岩电参数a 、m值。综合建立了在井筒剖面利用测井响应特征识别储层不同孔隙结构类型、分孔隙结构类型确定岩电参数的方法，以此为基础再进行饱和度计算，有效地提高了低渗透砂岩储层饱和度测井解释的精度。

英文摘要：

Low permeability is a salient feature of Es3 reservoirs in the southern slope of Dongying Sag. And the complex pore structure makes it difficult to unify electrical parameters, which brings some difficulties to evaluating reservoir saturation. The pore structures of low permeability sandstone reservoir in Es3 are analyzed, based on core physical properties, casting thin sections and mercury injection data. It is divided in to 3 categories and 5 subcategories, combined with rock electricity experiment data to extract rock-electrical parameters ＂a＂ and ＂m＂ from different pore structure of reservoir in Es：~. Along with the wellbore profile, using well logging response characteristics,a comprehensive method is established. It can identify different pore structure types and determine the rock-electrical parameters of different pore structure types. As a ba- sis for further saturation calculation,it effectively improved the accuracy of low permeability sandstone res- ervoir saturation interpretation.