Porosity is the most common form of reservoirs, and its size, shape, and connectivity directly affect the capacity of oil and gas storage and production. To study the micro–nano-pore structure characteristics of shale oil reservoirs and quantitatively characterize its heterogeneity, this work uses high-precision high-pressure mercury intrusion (HPMI) experimental techniques to study the micro–nano-pore structure characteristics of shale oil, and based on the experimental data, fractal theory is used to quantitatively characterize its heterogeneity. The results of the study show that the micro–nano-pores in the shale oil reservoir are concentrated and continuous, and the pore radius is mainly distributed among the range of 30–500 nm, nanoscale pores are an important part of the pores of the shale oil reservoir. The fractal dimension of the shale oil reservoir is larger than the fractal dimension of typical tight oil reservoirs, indicating that the heterogeneity of shale oil reservoir is stronger. The research results have some theoretical and practical significance for the production of inter-salt shale oil reservoirs.

孔隙度是最常见的储层形式，其大小，形状和连通性直接影响着油气储藏和生产的能力。为了研究页岩油储层的微纳米孔结构特征并定量表征其非均质性，这项工作使用高精度高压汞侵入（HPMI）实验技术研究了页岩油的微纳孔结构特征，基于实验数据，使用分形理论定量表征其异质性。研究结果表明，页岩油储层中的微纳孔隙集中且连续，孔隙半径主要分布在30〜500 nm范围内，纳米级孔隙是该页岩孔隙的重要组成部分。页岩油藏。页岩油藏的分形维数大于典型致密油藏的分形维数，说明页岩油藏的非均质性较强。研究结果对盐间页岩油藏的生产具有一定的理论和实践意义。