Objective Nowadays,the governments and worldwide energy and environmental scientists have been focusing on CO_2enhanced coalbed methane recovery(CO_2-ECBM)to reduce greenhouse gas emissions and to increment coalbed methane production.Previous researches have confirmed that CO_2 can react with minerals in coal seams to transform the permeability of coal.However,few studies Objective Nowadays, the governments and worldwide energy and environmental scientists have been focusing on CO_2 enhanced coalbed methane recovery (CO_2-ECBM) to reduce greenhouse gas emissions and to increment coalbed methane production. Posted in Researchers have confirmed that CO_2 can react with minerals in coal seams to transform the permeability of coal. However, few studies