“…13,14 The permeability of a coal reservoir is mainly affected by the pore and fracture structures, and its complexity determines the anisotropy of permeability. 15,16 As for the application of X-ray CT technology in the characterization of coal, previous studies mainly focused on the characterization methods of pore and fissure 17 and then proposed complete workflows from porescale imaging to determining absolute permeability 18 and studied the impact of image processing methods on the morphology of porous media, pore and fracture structures, and physical properties. 13 Based on the X-ray CT data, there are few studies on the complexity of pore and fracture structures and the heterogeneity of permeability in the direction of coal reservoirs.…”