Effects of gas components, reservoir property and pore structure of shale gas reservoir on the competitive adsorption behavior of CO2 and CH4

CO 2 injection into shale gas reservoirs is deemed as a potential scheme to enhance CH 4 recovery and achieve the ambition of carbon neutral. The insufficient research binary competitive adsorption behavior at in-situ conditions reservoirs, coupling control components, properties, pore structure on affinity limit its general application. Therefore, simulated using high-pressure multi-component experiments, effects properties are discussed. Subsequently, mathematical geological models Longmaxi reservoir enhancing achieving sequestration established based experimental parameters parameters, feasibility expectation benefits results exhibit that selectivity coefficient relative (Sc) decreases with higher mole fraction, whereas it increases total organic content (TOC) clay content. Both volume (PV) specific surface area (SSA) have clear positive correlations Sc. Overall, TOC crucial controlling factor capacity shale, further, affects . shows promising application prospect in improving emission reduction models, leakage risk low after sequestration. • Adsorption controlled by feed composition property. Sc affected TOC, content, parameters. Ultra-micropores dominate micropores. EGR-CCS has prospect.