Therefore, the conventional gas content measurement is invalid to lignite.

因此, 传统的煤层气含量确定方法不适用于褐煤.

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However, in areas with weaker hydrodynamics, or stagnant area, the coal usually has high gas content.

相反, 在水动力不活跃地区或滞流水区域, 煤层气的含量就比较高.

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But during coal mining, often stop production because of gas content in natural coke increase.

但在煤矿生产中却经常是遇到天然焦因瓦斯增大而中止生产的现象时有发生.

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The flowing groundwater in coal measure can affect the coalbed gas content largely.

煤系中流动的地下水对煤层气的含量影响很大.

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