利用瞬变电磁技术进行地下水资源勘察

为解决内蒙古白旗地区水资源严重短缺的问题，采用瞬变电磁技术进行水资源勘察.本文通过分析平原地区含水层的矿化度和孔隙度对岩石电阻率的影响，得出在内蒙古干旱牧区浑善达克沙地的含水砂砾岩电阻率值为75~150 Ω·m之间变化.以导电球体为模型来计算地下含水层异常的可分辨时间窗口，确定该区地下含水层异常出现最大值的探测条件.瞬变电磁技术在结合已知自流井的电性差异基础上，可以对地下水的含水层和含水深度进行准确勘察，确定新的水井5位置，经钻孔验证喷水量达到每小时100 m3以上，满足白旗供水需求.验证了瞬变电磁技术在地下水资源勘察中的有效性，为西部地区水资源的评价提供了重要的技术依据.

Underground water prospecting by Transient electromagneticmethod

In order to resolve the problem of severely lack of water resource in Neimenggu, the TEM (Transient electromagnetic method) is applied in water prospecting. Through analyzing the relation between the resistivity and mineralization and rock hole of plain area watering layer, it is derived that the conglomerate resistivity varies from 75 to 150Ω·m in Hunshandake desert. Based on model of conductive sphere the differentiable time window of the abnormal of watering layer can be calculated. Then exploring condition is determined for finding the maximum abnormal of watering layer in this area. The location and the depth of watering layer can be exactly confirmed by TEM combining with electric difference of the known artesian well. The new decided well 5 can spout out 100 m3 per hour, meeting the need of BaiQi water supply. This proves the validity of TEM applied in the water resource prospecting, which is important to the West Area water resource evaluation.