The Stress Sensitivity and Porosity Sensitivity of Coal Permeability at Different Depths: A Case Study in the Pingdingshan Mining Area

Determining the relationships among the stress, porosity and permeability of coal masses at different depths is a key problem in coalbed methane extraction and greenhouse gas storage. In this study, we successfully conducted porosity and permeability experiments under different depth-dependent hydrostatic stress conditions using coal samples collected from the same coal seam group but at five different depths in the Pingdingshan mining area. The...