There are many middle and small types of basin in China with abundant coal bed methane resource, PetroChina has made breakthough of coal bed methane exploration in some basins.

• 中国中小型含煤盆地种类众多,煤层气资源巨大,中国石油天然气股份有限公司对一些盆地的煤层气勘探已经取得了突破。