煤储层对含CO2混合气体吸附特性的研究进展

he technique of CO2/N2-ECBM can not only enhance coalbed methane production, but also reduce CO2 concentrations into the atmosphere. Therefore it is an important technology to support common development in terms of energy and environment. When single component or multi-component gas (CO2/CH4/N2) is injected into coal seams, the processes of gas transport including adsorption/desorption, diffusion and flow of gas play an important role in enhancing coalbed methane recovery and CO2 sequestration. This paper introduces the quantitative characteristics of pore structure and measurement methods of gas adsorption. Secondly, the influencing factors on gas adsorption including coal rank and maceral, pressure, temperature, moisture and gas component are analyzed. Finally, a discussion of gaps should be strengthened in the future. The gas adsorption of lump coal and the optimal ratio of CO2/N2 should be investigated when the temperature and pressure are obviously higher than 50℃ and 10 MPa.