河西走廊祁连山山前第四系潜水浅埋带分布规律

A study of the shallow zone of the Quaternary phreatic aquifer in the piedmont of the Qilian Mountains in the Hexi Corridor

本文根据近5年来地下水勘查成果,对祁连山山前缺水地区水文地质特征、相对浅埋区的形成分布进行了综合分析,提出了基底隆升、“叠瓦状”台阶式断裂、逆冲压扭性断裂、地堑型四种控制地下水埋深的构造类型;提出在不同类型控水条件下寻找地下水相对浅埋的方向,指导寻找可利用的地下水源,解决该区人畜饮水困难。以肃南严重缺水区大黄沟滩勘查示范为例,在地堑型控水区找到埋深160m、矿化度小于0.6g/L、单井涌水量大于1 500m3/d的优质饮用水源。

Hydrogeologic conditions of the piedmont areas, especially the shallow zone of the phreatic aquifer, of the Qilian Mountains in the Hexi Corridor have been investigated in recent 5 years. Structure types controlling groundwater occurrence of basement uplift, faults of imbricated step, compressive faults of obduction, and graben are put forward. This paper also puts forward guidelines for locating shallow groundwater under the conditions of different structure-controlling types to solve the problem of looking for drinking water in water shortage areas. Taking the water shortage area of the Dahuanggou exploration demonstration as an example, this paper describes the location of groundwater, which occurs in the graben structure type at a depth of 160m with a specific well discharge of 1 500m^3/d and has a TDS of less than 0.6g/L.