Abstract Organic-matter (OM) pores play a significant role in the pore systems of shale formations. Numerous studies have analyzed the characteristics of OM pores. However, fewer studies reported the effects of OM pores on shale properties. In this study, a comprehensive pore-scale investigation of the impacts of OM pores on various physical properties of shale samples based on multicomponent and multiscale shale models is presented. To this end, a novel technique for constructing three-dimensional (3D), multicomponent, and multiscale shale models was proposed. Multiple shale models with different fractions of OM pores were then generated using the proposed algorithm. Based on these shale models, the effects of OM pores on the geometric properties, topological properties, correlation functions, and transport properties of pore space were comprehensively evaluated within the physics-based and realistic models. The results show that the addition of more OM pores in a pore system increases its connectivity, decreases its tortuosity, and strengthens the correlation of the voxels in the pore structure. At the same time, it enhances the surface roughness of the pore space, the proportions of small pores, and the number of isolated pores. Besides, the generation of more OM pores into the pore space leads to the increase of the permeability and decrease of the formation factor of the shale models.

中文翻译：

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有机质孔隙对页岩性质影响的综合研究：多分量和多尺度建模

摘要 有机质（OM）孔隙在页岩地层的孔隙系统中起着重要作用。大量研究分析了OM孔隙的特征。然而，很少有研究报告 OM 孔隙对页岩性质的影响。在这项研究中，基于多组分和多尺度页岩模型，对 OM 孔隙对页岩样品的各种物理性质的影响进行了全面的孔隙尺度研究。为此，提出了一种用于构建三维 (3D)、多组分和多尺度页岩模型的新技术。然后使用所提出的算法生成具有不同比例的 OM 孔隙的多个页岩模型。基于这些页岩模型，OM 孔隙对几何性质、拓扑性质、相关函数、在基于物理和现实的模型中综合评估了孔隙空间的传输特性。结果表明，在孔隙系统中加入更多的OM孔隙会增加其连通性，降低其曲折度，并加强孔隙结构中体素的相关性。同时，它提高了孔隙空间的表面粗糙度、小孔隙的比例和孤立孔隙的数量。此外，更多的 OM 孔隙进入孔隙空间导致页岩模型渗透率增加和地层因子降低。并加强了孔结构中体素的相关性。同时，它提高了孔隙空间的表面粗糙度、小孔隙的比例和孤立孔隙的数量。此外，更多的 OM 孔隙进入孔隙空间导致页岩模型渗透率增加和地层因子降低。并加强了孔结构中体素的相关性。同时，它提高了孔隙空间的表面粗糙度、小孔隙的比例和孤立孔隙的数量。此外，更多的 OM 孔隙进入孔隙空间导致页岩模型渗透率增加和地层因子降低。