摘要
1 Introduction With the increasing demand and the lack of natural gas in China, the unconventional gas is urgently needed as the substitute of the conventional natural gas which is explored more difficult. Coal bed methane is the most possible substitute of the conventional natural gas for the reason that our country is rich in coal resource and CBM （CBM is short for coal bed methane） resource is very rich in China.
1 Introduction With the increasing demand and the lack of natural gas in China, the unconventional gas is urgently needed as the substitute of the conventional natural gas which is explored more difficult. Coal bed methane is the most possible substitute of the conventional natural gas for the reason that our country is rich in coal resource and CBM （CBM is short for coal bed methane） resource is very rich in China.
