Absolute adsorption and adsorbed volume modeling for supercritical methane adsorption on shale

Abstract Adsorbed methane significantly affects shale gas reservoir estimates and transport in formations. Hence, a practical model for accurately representing adsorption behavior at high-pressure high-temperature is imperative. In this study, reliable mathematical framework that the absolute directly from low-pressure excess data applied to describe literature. This method provides detailed information on volume density of adsorbed methane. The obtained results indicate extensively used supercritical Dubinin-Radushkevich with constant phase underestimates high pressure. increases both pressure expands temperature. reduces above 10 MPa, approaches steady value study novel estimating gas, which expected improve prediction place production.