The coalbe methane is natural gas in coalbed and the coalbed methane system is a natural system that encompasses coal beds and coalbed methane in them as well as all the geologic ...

• 煤层气是赋存于煤层中的天然气,而煤层气系统是由煤层和其中的煤层气及煤层气藏形成所必需的一切地质要素和作用所组成的天然系统,煤层是煤层气系统的焦点。