Taking the Cambrian organic‐rich shale in northern Guizhou for research object, total organic carbon (TOC), and X‐ray diffraction (XRD) were used to study shale lithofacies, and scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), and nitrogen adsorption analyses were combined to reveal pore structure, in order to document the effect of shale lithofacies on pore structure. The results show that the Niutitang shale can be divided into six shale lithofacies, and three (siliceous shale lithofacies, carbonate‐rich siliceous shale lithofacies, and carbonaceous/argillaceous containing siliceous shale lithofacies) of them can be identified. Four types of pores (organic matter, interparticle, intraparticle, and dissolved pores) are present in the Niutitang shale. Organic matter and interparticle pores mainly occur in siliceous shales, and intraparticle and dissolved pores typically develop in carbonate‐rich siliceous shales and carbonaceous/argillaceous containing siliceous shales. Organic matter and brittle minerals related pores are two significant components of the pore volume in the Niutitang shales. The micropores and mesopores volumes promptly increase with the increase in organic matter content, indicating that organic matter is the primary contributor to micropores and mesopores. Clay content shows weakly negative relations with both the micropore and mesopore volumes. The development of macropores is associated with inorganic minerals (i.e., clay and carbonate). Organic matter and clay contribute the most to specific surface area, while the contribution of brittle minerals is negligible. Siliceous shales are the most favourable reservoir for shale gas due to their tremendous specific surface area and pore volume. In contrast, carbonate‐rich siliceous shales have the least storage capacity of shale gas because of their relatively smaller specific surface area and pore volume.

中文翻译：

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岩相对贵州北部寒武纪富含有机质页岩孔隙结构的影响

以贵州北部寒武系富含有机质页岩为研究对象，利用总有机碳（TOC）和X射线衍射（XRD）研究页岩岩相，扫描电镜（SEM），压汞法（MIP）结合氮吸附分析揭示孔隙结构，以证明页岩岩相对孔隙结构的影响。结果表明，牛塘塘页岩可分为6个页岩岩相，其中3个（硅质页岩岩相，富含碳酸盐的硅质页岩岩相和含碳质/泥质含硅质页岩岩相）可以被识别出来。牛塘塘页岩中存在四种类型的孔隙（有机物，颗粒间，颗粒内和溶解的孔隙）。有机质和颗粒间孔隙主要发生在硅质页岩中，通常在富含碳酸盐的硅质页岩和含碳/泥质硅质页岩中形成颗粒和溶解的孔隙。有机质和脆性矿物相关的孔隙是牛塘塘页岩孔隙体积的两个重要组成部分。随着有机质含量的增加，微孔和中孔的体积迅速增加，表明有机物是微孔和中孔的主要贡献者。粘土含量与微孔和中孔体积均显示弱的负相关。大孔的发展与无机矿物（即粘土和碳酸盐）有关。有机物质和粘土对比表面积的贡献最大，而脆性矿物的贡献可以忽略不计。硅质页岩因其巨大的比表面积和孔体积而成为最适合页岩气的储层。相比之下，富含碳酸盐的硅质页岩的页岩气储量最小，因为它们的比表面积和孔体积相对较小。