Water filling sources of underground mine in Pingshuo mining area have Quaternary pore water, surface water, Permo-Carboniferous sandstone fissure water and Ordovician limestone karstic fissure water.
平朔矿区井工矿井的充水水源有第四系孔隙水及地表水、石炭—二叠系砂岩裂隙水、奥陶系灰岩岩溶裂隙水。
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PermoCarboniferous coal series have relative good coal gas potential, dark mudstones in lower Jurassic, lower part of Middle Jurassic and lower Cretaceous are the best source rocks.
Fractal theory was used in this paper, and fractal feature of grain distribution of sandstone in coal-bearing strata in PermoCarboniferous System was studied.