Effects of Supercritical CO₂ Fluids on Pore Morphology of Coal: Implications for CO₂ Geological Sequestration

A systematic knowledge of the pore morphology of coal treated with supercritical CO2 (ScCO2) is critical for the process of CO2 geological sequestration. To better understand the desorption mechanism and to evaluate the storage capacity of target coal seams, the changes in pore volume, pore size distribution, fractal dimension, pore shape, and connectivity in high-, middle-, and low-rank coals were analyzed using N2/CO2 adsorption and mercury...