综合物探方法在水资源勘察中的应用

The application of comprehensive geophysical prospecting method in water exploration

为解决渭南市合阳县地区水资源短缺问题,选用瞬变电磁法与放射性α测量两种方法,在该地区展开找水工作。矩形大回线源瞬变电磁法在地下水勘查中具有广泛应用,采用晚期视电阻率计算存在明显的边界效应,这里利用全区视电阻率计算方法验证了矩形大回线源瞬变电磁法可以有效地压制边界效应。放射性找水方法相比于传统电法勘探具有一系列的优点,在地下水勘察中应用也越来越广泛。α射线异常可以大致圈定构造断裂,电阻率的分布特征可确定地下含水断裂位置,瞬变电磁法和放射性α测量两种方法相互验证,互为补充,提高了找水的精确性,有效降低勘探的风险。通过钻井验证单井出水量可达60m3/h,解决了当地居民的生活及农作物的灌溉用水,为该地区水资源的勘探提供了借鉴。

In order to solve the problem of water shortage in HeYang of Wei Nan city,we select the transient electromagnetic method and radioactive method to search for underground water in this area.The rectangle large loop source transient electromagnetic method was widely used in the exploration of the groundwater.There was obvious boundary effective when we use terminal of the apparent resistivity to calculate,but when we select all-time apparent resistivity to calculate it that can effectively suppress the boundary effect,and it is showed in article.Structure faulting is beneficial to radioactive gas migration to the surface,then we can measured the radioactive abnormal.Radioactive method has a series of advantages compared with the traditional electrical method.It also be widely used in the exploration of groundwater.Radioactive abnormal can be broadly framed structure facture,and the distribution features of the resistivity can be framed the position of underground water-bearing fracture.It was mutual authentication and complement each other between two method,and it improves the accuracy of the water,reducing the risk of exploration effectively,too.Drilling verification single well water yield can be up to 60 m3/h,it solve the problem of he lives of local residents and crop irrigation water,and providing an important technical basis for water exploration in the future.