A full-scale approach to characterize PS/VD in LSBC was investigated.
CH4 is concentrated on adsorbing at pore surfaces in 2–10 nm and 10–50 nm.
Gas flow ability increases with rising micro-fractures.
Coal with T2c > 5 ms and high seepage pore peak generally exhibits high permeability.
Pore-fractures permeability is controlled by the area of the T2 (>2.5 ms) distribution.