Detailed study on the pore structure of shale oil reservoir is significantly for the exploration and development, and the conventional single pore structure measurement method cannot accurately describe the pore structure characteristics of the shale oil reservoir. In this paper, the Field Emission Scanning Electron Microscope (FESEM), low-pressure nitrogen adsorption (LP-N2A) and mercury injection porosimetry (MIP) techniques are used to comprehensive evaluate the pore structure of Chang 7 shale oil reservoir. The FESEM results show that inter pores, inner pores, organic pores and micro-cracks are developed in Chang 7 shale oil reservoir, and the pore structure can be divided into two groups from the LP-N2A and MIP. A new pore structure comprehensive evaluation method was promoted according to the connection points from the pore sizes distribution curves of LP-N2A and MIP. With this comprehensive analysis of the pore size distribution, the pore size distribution of various shale samples feature as triple-peak pattern. Due to the heterogeneity of the shale oil samples, the corresponding pore apertures of the connection points are various, and the overall pore size distribution of shale oil reservoir samples can also be divided into two types. In Group I, the size distributions exhibited a bimodal feature in a narrow range from 1.71 to 100 nm. The trimodal feature of size distributions was captured in Group II with the pore diameter ranges from 1.71 to 1426.8 nm. Group I features smaller sorting coefficient and good pore connectivity. However, the trimodal corresponds to the complex pore structure and larger sorting coefficient for Group II.

中文翻译：

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鄂尔多斯盆地长7页岩油储层纳米孔隙系统综合表征

详细研究页岩油储层孔隙结构对勘探开发具有重要意义，常规的单一孔隙结构测量方法无法准确描述页岩油储层孔隙结构特征。本文采用场发射扫描电镜（FESEM）、低压氮气吸附（LP-N2A）和注汞孔隙度（MIP）技术对长7页岩油储层孔隙结构进行综合评价。FESEM结果表明，长7页岩油储层发育间孔、内孔、有机孔和微裂缝，孔隙结构从LP-N2A和MIP可分为两组。根据LP-N2A和MIP孔径分布曲线的连接点，提出了一种新的孔结构综合评价方法。通过对孔径分布的综合分析，各种页岩样品的孔径分布具有三峰型特征。由于页岩油样品的非均质性，连接点对应的孔隙孔径多种多样，页岩油储层样品的整体孔径分布也可分为两种类型。在第 I 组中，尺寸分布在 1.71 到 100 nm 的窄范围内表现出双峰特征。粒径分布的三峰特征被捕获在组 II 中，孔径范围从 1.71 到 1426.8 nm。I组具有较小的分选系数和良好的孔隙连通性。然而，