Predicted CO_2 enhanced coalbed methane recovery and CO_2 sequestration in China

摘要

The injection of CO_2 in coal beds can enhance the recovery of coalbed methane (ECBM) and at the same time it is a very attractive option for geologic CO_2 storage as CO_2 is strongly absorbed onto the coal. Some factors affecting the primary production of CBM and ECBM recovery and CO_2 sequestration in China have been studied, and CBM recovery quantity with primary production, the CO_2 sequestration capacity of coal beds, and the ECBM recovery potential have been investigated in 29 CBM zones in China. The results show that the primary CBM and ECBM recovery potential are estimated to be over 3.357 and 3.751 Tm~3, which equals 218 years at China's 2002 production rate. The prediction also indicate that CO_2 sequestration potential is about 142.67 Gt in China's coal bed, which could sequester CO_2 emissions for almost 50 years based on China's CO_2 emissions levels in 2000.