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为了弄清蒙陕接壤区深埋型煤层顶板水文地质及水文地球化学特征,利用水文地球化学数据开展了综合研究,结果表明:白垩系志丹群与第四系之间水力联系密切,矿化度较低,属于HCO3-Ca型水,与志丹群底板标高没有相关性。安定组可有效地阻隔上部含水层水对直罗组的补给;大部分矿井主采煤层到安定组顶板距离较大(>250 m),导水断裂带不会波及志丹群含水。主采煤层顶板含水层水中矿化度与地层标高呈负相关关系,大部分水样属于深部滞留型的SO_4-Na型水;但榆横北区的几个矿,普遍属于SO_4-Na·Ca型水,Cl/HCO3值也偏小,表明榆横北区上下含水层联系相对较好。
In order to find out the hydrogeological and hydrogeochemical characteristics of the top coal seam in the area bordering Meng-Shan, a comprehensive study was carried out by using hydrogeochemical data. The results show that the Cretaceous Zhidan Group and the Quaternary have close hydraulic connection and mineralization Degree is low, belonging to HCO3-Ca-type water, and the shidan group floor height is not relevant. The stability group can effectively block the upper aquifer water supply to the Zhiluo group. Most of the main coal seam to the stability of the roof set a greater distance (> 250 m), the water-bearing fault zone does not affect the water containing Zhidan group. The main coal seam roof aquifer water salinity and formation elevation is negatively correlated, most of the water samples belong to the deep retention of SO_4-Na-type water; but several Yuyu North District, generally belong to SO_4-Na · Ca type water, Cl / HCO3 value is also too small, indicating Yuyu north area up and down the aquifer contact is relatively good.