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Comparison of the Pore Structures of Lower Silurian Longmaxi Formation Shales with Different Lithofacies in the Southern Sichuan Basin, China
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jngse.2020.103419
Ximeng Wang , Luofu Liu , Yang Wang , Yue Sheng , Shanshan Zheng , Wenwen Wu , Zehua Luo

Abstract The growing research on the features of shale pore structures has deepened the understanding of shale oil and gas storage capacity. Nevertheless, few studies have focused on the differences of the specific parameters that are characteristic of the nanopore structure in shales with different lithofacies. Such parameters include the full-scale ranges of the pore specific surface area and pore volume distribution, porosity and fractal dimension. In this paper, a dozen Longmaxi Formation shale samples from the southern Sichuan Basin were studied to determine the differences in these parameters. A set of laboratory experiments were performed, such as geochemical experiments, X-ray diffraction, N2 and CO2 isothermal adsorption, mercury injection capillary pressure tests and scanning electron microscopy experiments. The results of this study indicate that shale samples can be classified into 5 types of lithofacies based on their mineral composition. The surface porosity of organic matter particles is 8–16 times greater than that of mineral particles. The major contributors to the pore volume and surface area of shale samples are mesopores and micropores, respectively. The full-scale pore size distribution is mainly from 0.4 to 0.6 nm, 2–7 nm, and 10–20 nm for the pore volume and from 0.3 to 1.0 nm and 1.5–7 nm for the pore surface area. The average values of the porosity, fractal dimension, pore volume and pore surface area of the M-2 shales are almost equal to those of the S group shales. This result indicates that the M-2 shale has a large gas storage capacity similar to that of shales with siliceous lithofacies. The development of organic matter pores that contribute to more than 50% of the porosity leads to the high porosity and fractal dimension of the M-2 shales and S group shales. In addition to organic matter, illite minerals also play an important role in the constitution of the majority of the storage space in the CM-1 shale.

中文翻译:

四川盆地南部不同岩相下志留统龙马溪组页岩孔隙结构对比

摘要 对页岩孔隙结构特征的不断研究加深了对页岩油气储量的认识。然而,很少有研究关注不同岩相页岩中纳米孔结构特征的特定参数的差异。这些参数包括孔比表面积和孔体积分布、孔隙率和分形维数的全尺寸范围。本文对四川盆地南部的十几个龙马溪组页岩样品进行了研究,以确定这些参数的差异。进行了一系列实验室实验,如地球化学实验、X射线衍射、N2和CO2等温吸附、压汞毛细管压力测试和扫描电镜实验。本研究结果表明,页岩样品根据其矿物组成可分为 5 类岩相。有机质颗粒的表面孔隙率是矿物颗粒的 8-16 倍。页岩样品的孔隙体积和表面积的主要贡献者分别是中孔和微孔。全尺寸孔径分布主要是从 0.4 到 0.6 nm、2–7 nm 和 10–20 nm 的孔体积和从 0.3 到 1.0 nm 和 1.5–7 nm 的孔表面积。M-2组页岩孔隙度、分形维数、孔隙体积和孔隙表面积的平均值与S组页岩几乎相等。该结果表明M-2页岩具有与硅质岩相页岩相似的储气能力。占孔隙度 50% 以上的有机质孔隙的发育导致 M-2 页岩和 S 组页岩的高孔隙度和分形维数。除有机质外,伊利石矿物在 CM-1 页岩大部分储集空间的构成中也发挥着重要作用。
更新日期:2020-09-01
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