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地理科学  2013 

华北隐伏型煤矿深部含水层补给源水化学与同位素示踪

, PP. 755-762

Keywords: 隐伏型煤矿,水化学,同位素,深层地下水,补给源

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Abstract:

为了阐明华北隐伏型煤矿深部含水层补给条件,以淮北煤田临涣矿区任楼煤矿为例,采用水化学系统聚类分析与氢氧同位素示踪技术,结合采矿活动影响,分析与探讨煤矿深部含水层中的地下水补给源及其变化机制。研究表明矿区深层地下水形成机制为大气降水直接但不均匀入渗、滞留入渗以及古地下水混合。矿区深层地下水当总溶解固体(TDS)小于1000mg/L时,氢氧稳定同位素组成(δ值)随着TDS的增大而减小;当TDS大于1000mg/L时,δ值在平均值线附近。矿区深层地下水平均δD与δ18O分别为-67.4‰与-8.68‰,小于大气降水年平均δD与δ18O(δD=-52.4‰,δ18O=-7.80‰)。在未经采矿活动影响下,矿区深层地下水主要来源于大气降水直接但不均匀入渗补给形成的;经采矿活动影响后深部含水层长期向采空区充水,原地下水循环条件已被打破,在补给区水力交替加快,滞留于地表或土壤层的大气降水补给深部含水层。

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