Entropy and enthalpy changes during adsorption and displacement of shale gas

Shale gas is a major component of the hydrocarbon economy, and there are abundant studies in related exploration exploitation fields using simulations experiments. In this paper, kinetic processes adsorption displacement during shale analyzed enthalpy-driven entropy-driven with molecular dynamics statistical mechanics analyses. First, changes symmetry CH 4 CO 2 adsorbed on graphene surface analyzed. The process spontaneous process, where Gibbs free energy decreases. During entropy enthalpy system decrease, which indicates an process. various molecules (CH , N H O) obtained. Through comparing before after by different media (CO O). -injected driven both entropy, entropy. However, O-injected not It plays certain role reducing partial pressure . To clarify detailed processes, change exothermic supercritical fluid discussed; then, differences efficiency fluids explained. This study useful for understanding kinetics mechanism gas. • Entropy Enthalpy determined. A new perspective to explain displacing provided.