综合物探法在密云水库变质岩地区地下水勘查中的应用  

Application of comprehensive geophysical exploration method in groundwater exploration of metamorphic rock of Miyun Reservoir

作　　者：段石敦 Duan Shidun(Beijing Institute of Geology and Mineral Resources,Beijing 101500)

机构地区：[1]北京市地质矿产研究所,北京101500

出　　处：《工程勘察》2025年第3期78-86,共9页Geotechnical Investigation & Surveying

摘　　要：变质岩地区富水性整体较弱且地下水分布不均,找水难度较大。构造裂隙、破碎带是寻找变质岩贫水区相对稳定富集水源的重要靶区。为解决密云水库周边村民饮用水井淹没等饮用水安全问题,本文应用氡气测量、音频大地电磁测深法和瞬变电磁法综合物探法对密云水库周边大漕村和上金山村片麻岩区断裂带进行了地下水勘查。结果表明,基岩地区张性断裂带及其影响带附近主要表现为“凹陷”状或“条带”状低阻特征,氡气值异常,采用综合物探与水文地质钻探相互印证等技术,取得了良好的找水效果,为类似地区开展地下水勘查提供了借鉴。It is difficult to find water in metamorphic rock area because of weak water-bearing and uneven groundwater distribution.Structural fractures and fault zones are the important target areas to find relatively stable and rich water sources in the meagre water area of metamorphic rocks.In order to solve the safety problem of drinkable water,such as inundated wells of the residents around Miyun Reservoir,the groundwater in the granite and gneisses fault zone of Dacao village and Shangjinshan village is investigated using radon gas survey,audio magnetotelluric and transient electromagnetic integrated geophysical exploration.The results show that the tensile fault zone and its influence zone in the bedrock area are mainly characterized by"depression"or"stripe"type of low resistivity and abnormal radon gas value.The technique of comprehensive geophysical exploration and hydrogeological drilling to verify each other is employed and good results have been obtained in the water resource searching,which could be referred in groundwater exploration in the similar areas.

关 键 词：地下水勘查 氡气测量 音频大地电磁测深法 瞬变电磁法 

分 类 号：TU42[建筑科学—岩土工程]