Due to the complicated lithology in the E_S3 Member of the Shahejie Formation in the Shulu sag, Jizhong depression, it is difficult to classify the rock types and characterize the reservoirs at the marl intervals. In this paper, a four-element classification method has been proposed, and seven rock types have been identified by analyzing the mineral composition. The primary rock types are medium-high organic carbonate rocks and medium-high organic shaly-siliceous carbonate rocks. With the methods of field emission scanning electron microscopy, high-pressure mercury intrusion, nitrogen adsorption, and nano-CT, four types of reservoir spaces have been identified, including intra-granular pores, intergranular pores (inter-crystalline pores), organic pores, and micro-fractures. By combining the method of high-pressure mercury intrusion with the method of the nitrogen adsorption, the porosity of the marl has been measured, ranging from 0.73% to 5.39%. The distribution of the pore sizes is bimodal, and the pore types are dominated by micron pores. Through this study, it has been concluded that the sag area to the east of Well ST1H is the favorable area for the development of self-sourced and self-reservoired shale oil. According to the results of geochemical and reservoir analysis, the III Oil Group may have sweet spot layers.

由于 E _{S 3 中}复杂的岩性冀中坳陷束鹿凹陷沙河街组段泥灰岩层段岩石类型和储层特征难以划分。本文提出了一种四元素分类方法，通过对矿物成分的分析，确定了七种岩石类型。主要岩石类型为中高有机碳酸盐岩和中高有机质页岩硅质碳酸盐岩。采用场发射扫描电镜、高压压汞、氮吸附、纳米CT等方法，识别出粒内孔、粒间孔（晶间孔）、有机质孔4类储集空间。 , 和微裂缝。将高压压汞法与氮气吸附法相结合，已测量泥灰岩的孔隙率，范围从 0.73% 到 5.39%。孔径分布呈双峰分布，孔隙类型以微米孔为主。通过本次研究，认为ST1H井以东凹陷区是页岩油自源自储开发的有利区域。根据地球化学和储层分析结果，Ⅲ油组可能存在甜点层。