Abstract：Geological storage is an effective means of reducing anthropogenic atmospheric emission of CO2 to alleviate the worsening global climate change. CO2 storage in coalbeds can effectively reduce the emission of CO2，and at the same time，it can enhance the recovery of coalbed methane to reduce the cost of CO2 geological storage. The CO2 molecules are absorbed on the surface of coal matrix and the methane molecules can be released when CO2 is injected into the coalbeds. The absorbed CO2 on coal matrix can be kept stably in coalbeds for geologic time. There is a huge storage capacity for CO2 in coalbeds in China for the wide distribution and abundant resources of coal. Putting CO2 into coalbeds should be the prior choice for its security and safety. According to the latest prospecting data of coal and coalbed methane resources in China and the replacement ratio between CO2 and CH4 in the coal with different ranks，it is estimated that the CO2 storage can be performed from depth of 300 m to 1 500 m in the main coalbed methane basins in China. The total recoverable coalbed methane resources will approach to 1.632×1012 m3 if the CO2-enhanced coalbed methane recovery(CO2-ECBM) technology is utilized，and the CO2 storage capacity in coalbeds is about 120.78×108 t，which is about 3.6 times as the total CO2 emission of China in 2002.
