焦油产率系随着不同时代褐煤挥发分产率的增多而增加。
Tar yield increases with the increase of volatile matter yield of brown coal in different ages.
分析认为：研究区煤层气含量各煤层差异性较大，埋深、原煤挥发分、原煤水分、灰分产率等因素对煤层气含量均有一定的影响。
Factors such as buried depth, volatile matter of raw coal, water content and ash content in raw coal can produce influence upon gas content to some extent.
挥发分：煤在限定条件下隔绝空气加热后，所得挥发性有机物质的产率。
Volatile: coal in a limited conditions after isolate air heating, which the production rate of volatile organics.
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