Supercritical CO₂ Interaction Induced Pore Morphology Alterations of Various Ranked Coals: A Comparative Analysis Using Corrected Mercury Intrusion Porosimetry and Low-Pressure N₂ Gas Adsorption

Enhanced coal bed methane (ECBM) recovery via CO2 geological storage (CGS) involves CO2 adsorption and CH4 desorption from coal pores, gas diffusion, and flow through coal matrix and cleats, which are closely related to coal pore morphology. To characterize and quantify the alterations of pore morphology of different ranked coals treated by supercritical CO2 (ScCO2), CGS was simulated with a custom-built high-pressure ScCO2 geochemical reactor...