煤层透气性是在压力差作用下，煤层气在煤层中流动的难易程度。
分析了煤层透气性变化的影响因素及变化规律。
Factors affected coal seam permeability change and its law is analyzed.
研究了钻孔流量法反演煤层透气性的基本方法和特点，确定了煤层透气性反演的基本条件。
The basic method and features of coal seam permeability by using borehole flow method inversion is studied, the basic condition of coal seam permeability inversion in determined.
盘关向斜煤层主要属勉强可以抽放煤层和易于抽放煤层，部分为较难抽放煤层，煤系下部煤层透气性较上部煤层为好；
Most of the coalbeds in Panguan syncline are easilydrainable or drainable, and some are hard drainable. The lower coalbeds are better than the upper coalbeds in air penetrability.
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