榆神矿区水文地球化学特征精细分层研究  

Research on Aquifer Subdivision of Hydro-geochemical Characteristics in Yushen Mining Area

作　　者：康占忠 刘洋 KANG Zhanzhong;LIU Yang(Inner Mongolia Qipanjing Mining Co.,Ltd.,Erdos 016064,China;CCTEG Xi′an Research Institute,Xi′an 710054,China)

机构地区：[1]内蒙古棋盘井矿业有限责任公司,内蒙古鄂尔多斯016064 [2]中煤科工集团西安研究院有限公司,西安710054

出　　处：《煤炭技术》2022年第8期72-75,共4页Coal Technology

基　　金：国家自然科学基金项目(41302214);中煤科工集团西安研究院有限公司创新基金技术研究项目(2020XAYJS05)。

摘　　要：为了查清陕北榆神矿区各含水层水文地球化学特征,实现对井下出水点水源的快速准确判别,利用水文地质补充勘探和井下工作面顶板预疏放钻孔施工,开展了水文地球化学特征精细分层研究,结果表明:榆神矿区延安组2#煤层顶板的各含水层之间没有稳定隔水层,大气降水是主要的补给来源,形成了低矿化度和弱碱性为典型特征的地下水。顶板导水裂隙带范围内共发育3段含水段,出水段Ⅰ中水样的矿化度在655.9~830.6 mg/L,与出水段Ⅱ和出水段Ⅲ存在较明显差异,且Na^(+),Cl^(-),SO_(4)^(2-),HCO_(3)^(-)离子浓度也显著高于上覆2层出水段,可以作为出水段Ⅰ的水源判别依据。利用工作面回采前顶板预疏放钻孔施工过程中分层水化学特征分析,可以补充修正地质勘探和水文补勘期间未能对煤层顶板“两带”范围内进行精细刻画的不足,实现煤层顶板直接充水含水层水化学特征的精细分层。In order to make clear the hydro-geochemical characteristics of each aquifer in Yushen mining area and identify water inrush source quickly and accurately,aquifer subdivision of hydro-geochemical characteristics was carried during supplementary hydrogeological exploration and borehole construction for roof pre discharging in working face.The results showed that the aquifers of the No.2 coal roof in the study area were mainly subjected to atmospheric precipitation.Leaching effect caused Na ions partially dissolved in.Three layers of water outlet had been developed within the water conducted fracture zone of coal seam roof,and leaching effect caused several ions concentration increased.TDS concentration was 655.94-830.6 mg/L in aquiferⅠ,and that was different with aquiferⅡand aquiferⅢobviously.The concentrations of Na^(+),Cl^(-),SO_(4)^(2-)and HCO_(3)^(-)were also higher than the overlying aquifers,which could be used as discriminant basis for aquiferⅠ.The research of hydro-geochemical characteristics for coal seam roof during borehole construction for roof pre discharging in working face could be mad up the shortcomings of aquifer subdivision for geological exploration and supplementary hydrogeological exploration,and aquifer subdivision of hydro-geochemical characteristics for coal seam roof aquifers was achieved.

关 键 词：水文地球化学 精细分层 导水裂隙带 榆神矿区 鄂尔多斯盆地 

分 类 号：P641[天文地球—地质矿产勘探]