次生混合气既是一种不可忽视的灾害性气体，也是煤盆地老矿区特有的、可供开发利用的洁净能源。
The secondary mixed gas is not only one kind of noticeable catastrophe gas, but also is the unique and useful pure energy in old mining area of coal basin.
淮南煤田煤层气属于热成因和次生生物成因气的混合气。
Coalbed gases in Huainan coal field is a gas mixture resulted from thermogenic methane and secondary biogenic gas.
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