Supercritical-CO Adsorption Quantification and Modeling for a Deep Coalbed Methane Reservoir in the Southern Qinshui Basin, China.

Accurate depiction of the adsorption capacity of supercritical CO (ScCO) by existing adsorption models is an important focus for deep coal seams in CO-enhanced coalbed methane (CO-ECBM) recovery. To investigate the applicability of different adsorption models for the adsorption isotherms of ScCO, the validities of 10 different adsorption models were analyzed, based on analyses of the adsorption characteristics of ScCO from deep coal seams of the Southern Qinshui Basin, China. These models include the Langmuir (L) model, two-parameter Langmuir (TL) model, Toth (T) model, Langmuir-Freundlich (LF) model, extended Langmuir (EL) model, double parameter Brunauer-Emmett Teller model, three-parameter BET (TBET) model, Dubinin-Radushkevich (D-R) model, Dubinin-Astakhov (D-A) model, and Ono-Kondo lattice (OK) model.