Permeability of coal reservoirs influence the extraction of coal gas from coal seams. Twelve coal samples were collected at an anticline and a syncline of the No. 3 coal seam in the Sihe coal mine. Porosity, permeability, pore size, vitrinite reflectance, and liquid nitrogen adsorption of the samples were evaluated. Structural curvatures at the sample locations, and the distance between the sampling locations and the nearest faults were calculated based on seismic data. The influences of the evaluated parameters on permeability were analyzed. Major factors that influence permeability of the No. 3 coal seam were extracted using principal component analysis (PCA). Based on the porosity–permeability model derived from the Archie formula and classic Kozeny–Carman equation, we deduced that the permeability of coal increased with an increase in porosity. With an increase in average vitrinite reflectance, permeability decreases first and then increases. PCA results showed that coal permeability was regulated by three key components representing three modes. The first component included pore size, depth, and pore complexity accounting for 52.59% of the variability indicating that it was the most important in controlling permeability. The second component included specific surface area, structural curvature, and porosity, and the third component comprised of specific surface area, porosity, and average vitrinite reflectance. Overall, pore diameter and complexity had significant effects on coal permeability. The results show that researchers and stakeholders must consider the interactions among multiple factors rather than single factors to understand the influences on permeability to facilitate efficient utilization of coalbed methane resources.

煤储层的渗透率影响煤层瓦斯的开采。在四河煤矿3号煤层的背斜和向斜处采集了12个煤样。评估了样品的孔隙率、渗透率、孔径、镜质体反射率和液氮吸附。根据地震数据计算采样位置的结构曲率，以及采样位置与最近断层之间的距离。分析了评价参数对渗透率的影响。采用主成分分析法（PCA）提取了影响3号煤层渗透率的主要因素。基于 Archie 公式和经典 Kozeny-Carman 方程推导出的孔隙度-渗透率模型，我们推导出煤的渗透率随着孔隙度的增加而增加。随着平均镜质体反射率的增加，渗透率先下降后上升。PCA 结果表明，煤的渗透率受代表三种模式的三个关键成分的调节。第一个成分包括孔径、深度和孔隙复杂性，占变异性的 52.59%，表明它是控制渗透率的最重要因素。第二个分量包括比表面积、结构曲率和孔隙率，第三个分量包括比表面积、孔隙率和平均镜质体反射率。总体而言，孔径和复杂性对煤的渗透率有显着影响。