Variations in the Pore Structure and Fractal Characteristics of No. 5 and No. 8 Coals in the Yichuan Area, Daning–Jixian Block, Ordos Basin
No. 5 and No. 8 coal seams in the Yichuan area, Ordos Basin, are primary targets for coalbed methane (CBM) development, yet their pore structure differences and controlling factors remain poorly understood. This study integrates CO2 adsorption, low-temperature N2 adsorption, and mercury intrusion porosimetry to charact...