High-pressure methane adsorption behavior on deep shales: Experiments and modeling

Understanding methane adsorption behavior on deep shales is crucial for estimating the original gas in place and enhancing recovery shale formations. In this study, within lower Silurian Longmaxi formation from Sichuan Basin, South China was conducted at pressures up to 50 MPa. The effects of total organic carbon (TOC), temperatures, clay minerals, moisture content capacity were discussed. results indicated that excess increased, then reached its peak, finally decreased with pressure. data fitted using models, it found Dubinin–Radushkevich (D–R) model superior other models predicting behavior. capacities exhibited strong positive correlations TOC negative relationships minerals. temperature, while opposite trend would occur once exceeded some presence sharply capacities, reduction occupy sites pores, which could result decreased.