因此，对煤层顶底板的变形破坏规律、构造特征以及断层各要素的研究都是防治奥灰岩含水层突水的关键问题。
Therefore, study on the deformation and breakage law of upper and down floor of coal layer, the character of formation, each fault factor are the key problem for prevention the water inrush.
煤层含气性是煤层气成藏的一个基本要素，是煤层气勘探开发决策的重要依据之一。
Gas -bearing nature of coal bed is a basic factor of coal gas reservoir, and also the one of important bases on prospecting and exploitation decision of coal bed gas.
排采制度是保证煤层气井生产排采成功的关键要素。
Production system which control the CBM well output fluctuation is a key factor to ensure production successfully.
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