Study on the Influence of Characteristics of Pore Structure on Adsorption Capacity of Tectonic Coals in Guizhou Province

The occurrence and migration of coalbed methane (CBM) is inseparably associated with the pore structure within coal seams. Three Permian Longtan Formation tectonic samples (QL, XL, XT) from Guizhou Province were studied to determine size distribution characteristics, as well factors that influence adsorption. Adsorption test results show all generally have “ink bottle”-type pores, large capacity but poor connectivity. Furthermore, fractal dimension Df, tortuosity “τ”, tortuous DT calculated. Among coals, moisture, ash, tortuosity, volatile fraction a positive effect on maximum adsorption (VL), whereas intact coals’ has negative correlation (VL).