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烟煤煤层内经常含有大量的气体,尤其是吸附在毛细孔内的沼气。为了从煤层内排出这些气体,波兰采用了水力压裂法。煤内的瓦斯含量决定于煤层的沉积条件、岩体结构及地质变化情况。在煤体内瓦斯存在于直径等于或大于0.2mm 的裂隙內,但多数瓦斯存在于直径小
Bituminous coal often contains a lot of gas, especially in the adsorption of methane in the pores. In order to discharge these gases from the coal seam, a hydraulic fracturing method was adopted in Poland. The gas content in coal depends on the sedimentary conditions of the coal seam, the rock mass structure and the geological changes. In coal, gas exists in a fracture with a diameter equal to or greater than 0.2 mm, but most of the gas exists in small diameter