综合电法在岩溶山区地下水勘探中的应用——以湖南怀化长塘村为例

The application of electrical prospecting method to groundwater exploration in karst mountainous areas: A case study of Changtang Village,Huaihua area,Hunan Province

岩溶山区水文地质条件复杂,地下水的分布规律对不同的物探方法可能存在不同的响应特征。综合采用高密度电阻率法和音频大地电磁法,在湖南怀化长塘村进行找水勘探,综合勘探结果很好地指示出异常特征和比较具体的异常位置。推断结果与钻井结果基本一致,最大涌水量大于146.88 m^3/d/。此次成果表明:对称四极反演结果能有效对地下横向电阻率的变化进行响应,且纵向上能够利用电阻率测深曲线(单支曲线)进行分层;音频大地电磁法探测深度大,能有效对地下断层构造进行响应。

The hydrogeological conditions in karst mountainous areas are complex,and the distribution of groundwater may have different response characteristics to different geophysical methods.In this paper,the high density resistivity method and audio magnetotelluric method were synthetically used to study the application of groundwater exploration in Changtang Village,Huaihua area.The comprehensive exploration results are better indicate the anomalous characteristics and specific anomalous locations.The inferred results are basically consistent with the drilling results,and the maximum water inflow is greater than 146.88 m^3/d.The study results show that symmetrical four-pole sounding inversion can effectively respond to the changes of underground transverse resistivity,and the resistivity sounding curve(single branch curve)can be used to make stratification vertically,the results of stratification are basically consistent with the results of drilling.The audio magnetotelluric method has a large detection depth and can effectively respond to subsurface fault structures.