摘要：Low-temperature nitrogen adsorption can form a"hysteresis loop"，whose geometry and area can effectively reflect the pore structure of porous media and its retention effect on adsorbed gas. However，the role of the"hysteresis loop"in quantitative characterization of shale pore structure has often been ignored. The study aims to clarify whether shale can form"hysteresis loop"in low-temperature nitrogen adsorption-desorption experiment and the determinants on hysteresis loop’s area with experiments on the 7th member of the Upper Triassic Yanchang Formation shale（Chang 7 shale） in the Ordos Basin. Various measures are applied in the study，including qualitative observation of pore structure under field-emission scanning electron microscopy （FE-SEM） and quantitative characterization of pore structure by low-temperature nitrogen adsorption test，hysteresis-loop quantitative analysis，total organic carbon（TOC）content analysis，pyrolysis and X-ray diffraction（XRD）experiments. The following results are obtained. First，whether shale can form a hysteresis loop in the low-temperature nitrogen adsorption-desorption experiment has an apparently positive correlation with the specific surface area，specific pore volume，clay mineral content，and pore structure fractal dimension，and an evidently negative correlation with the TOC content，while no apparent correlation with the average pore size，pore surface fractal dimension，highest pyrolysis peak temperature，and content of brittle minerals. Second，the hysteresis loop area depends on the development degree of the cylindrical pores with both ends open，ink-bottle pores，or parallel plate pores，the proportion of which to the total pores can be quantitatively evaluated by the hysteresis loop area. Third，the open-ended cylindrical pores，ink-bottle pores，or parallel plate pores in the samples from Chang 7 shale are mainly of the intergranular pores in clay minerals. Therefore，there is an apparently positive correlation between the hysteresis loop area and the content of clay minerals. ? 2023 Editorial Department of Oil and Gas Geology. All rights reserved.

ISSN号：0253-9985

卷、期、页：卷44期2：495-509

发表日期：2023-03-17

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）,地学领域高质量科技期刊分级目录（国外T2）

发表期刊名称：Oil and Gas Geology

参与作者：Zhang, Yueqiao,Wang, Xiayang

通讯作者：阿比德阿不拉,吕明阳,刘哲宇,郑伟

第一作者：宋泽章,姜福杰

论文类型：期刊论文

论文概要：宋泽章,阿比德阿不拉,吕明阳,Zhang, Yueqiao,姜福杰,刘哲宇,郑伟,Wang, Xiayang，Quantitative analysis of nitrogen adsorption hysteresis loop and its indicative significance to pore structure characterization：A case study on the Upper Triassic Chang 7 Member，Ordos Basin，Oil and Gas Geology，2023，卷44期2：495-509

论文题目：Quantitative analysis of nitrogen adsorption hysteresis loop and its indicative significance to pore structure characterization：A case study on the Upper Triassic Chang 7 Member，Ordos Basin