崔俊峰,李媛,王大龙,郑洁铭,汪义龙,马永忠,殷裁云

• 1:庆阳新庄煤业有限公司新庄煤矿
• 2:中国煤炭地质总局勘查研究总院
• 3:华能煤炭技术研究有限公司

摘要(Abstract)：

位于鄂尔多斯盆地南部的宁正矿区水资源短缺，地下水是该地区需要保护的重要饮用水资源。宁正矿区煤层的开采对深埋含水层地下水的水质演变有一定的影响，水文地球化学研究将为后期矿井防治水及生态保护工作奠定基础。在宁正矿区采集了6个地表水样品，47个地下水样品(包括第四系、白垩系、侏罗系及三叠系含水层),以地下水主要离子、pH值和总硬度作为变量，进行层次聚类分析，得到六个聚类(C1—C6),其水化学特征表现出明显区别。水化学特征随地下水埋深的分布趋势表明深埋地下水的水岩相互作用程度远高于浅埋地下水。水样在Gibbs图上的分布显示，宁正矿区浅埋地下水(C1和部分C2)化学组分的主要控制作用是岩石风化作用，而随着深度增加，阳离子交换作用成为了主要的控制作用。深埋含水层中碳酸盐、硫酸盐和硅酸盐矿物均发生了溶解，共同影响着地下水化学组分的形成。深埋地下水中Ca~(2+)的来源包括碳酸盐岩和石膏的溶解。Na~+除了来源于岩盐的溶解以外，普遍受到钾长石、斜长石等硅酸盐矿物溶解的影响；地下水中的Na~+与含水层中的Ca~(2+)和Mg~(2+)之间发生的离子交换作用也是影响水化学特征一个重要水文地球化学过程。

关键词(KeyWords)： 宁正矿区;水文地球化学;水岩相互作用;层次聚类分析

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 崔俊峰,李媛,王大龙,郑洁铭,汪义龙,马永忠,殷裁云

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