Numerical simulation on electrical conductivity characteristics of micro-fractures abounded coal matrix

Enhancing coal seam permeability is crucial for improving gas extraction efficiency, as the structural characteristics of the coal rock fissure network, being the primary seepage channel for gas, directly influence permeability. In this paper, based on the actual working conditions of Shanxi Huoerxinhe Coal Mine, CT scanning experiments are conducted on coal rock after mechanical cavitation and permeability enhancement to accurately extract and quantify fissure network structural parameters. These data are then integrated with Avi-zo-COMSOL data interaction technology to simulate the electrical conduction characteristics at the microscopic scale. The results indicate that, simulation results of gas seepage and electrical conduction along the Z-axis show that electric potential and pressure exhibit a uniform decreasing trend with increasing seepage distance. Meanwhile, seepage velocity initially decreases before increasing due to the complexity of the pore structure, while current density first increases and then decreases. These findings provide theoretical support and engineering insights for coalbed methane development and gas hazard prevention and control.