天然电场选频法的正演及在水库渗漏探测中的应用  

Forward Modeling for Frequency Selection Method of Telluric Current and Its Application to Reservoir Leakage Detection

作　　者：郭杰华 资锋[2] 段九龄 冯建新 张正发[2,4] GUO Jiehua;ZI Feng;DUAN Jiuling;FENG Jianxin;ZHANG Zhengfa(Hunan Provincial Natural Resources Investigation Institute,Changsha 417000,China;School of Earth Sciences and Spatial Information Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Department of Project Management,Hunan Vocational Collegeof Engineering,Changsha 410151,China;Shenzhen Investigation&Research Institute Co.,Ltd.,Shenzhen 518026,China)

机构地区：[1]湖南省自然资源调查所,湖南长沙417000 [2]湖南科技大学地球科学与空间信息工程学院,湖南湘潭411201 [3]湖南工程职业技术学院工程管理学院,湖南长沙410151 [4]深圳市勘察研究院有限公司,广东深圳518026

出　　处：《湖南科技大学学报（自然科学版）》2023年第2期27-34,共8页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(41002022);湖南省自然资源科研项目资助(2021G12)。

摘　　要：对天然电场选频法剖面曲线开展正演模拟计算和实践应用工作,研究天然电场选频法剖面曲线的形成原因与实践应用的有效性.首先,采用矩形剖分、双线性插值函数对均匀半空间中的低阻异常体和高阻异常体模型开展有限单元法正演计算,分析地表沿测线方向上的二次电场分量随探测频率和异常体埋藏深度的变化规律;其次,将天然电场选频法应用于福建省南安市大湖水库的渗漏探测中,分析实测曲线与正演计算曲线之间的相似性.研究结果表明:现场实测曲线与理论曲线基本相似,说明天然电场选频法剖面异常主要是天然电磁场的二次电场分量所导致;同时,天然电场选频法是探测浅层低阻体的有效方法之一.The causes of the profile curve of frequency selection method(FSM)and its effectiveness of practical application are studied in this paper by forward simulation and practical application.Firstly,the rectangular subdivision and bilinear interpolation function are used to carry out the forward calculation of the finite element method(FEM)for the models of low resistivity anomaly and high resistivity anomaly in the uniform half space.In addition,the variation law of the secondary electric field component along the survey line with the frequency and the burial depth of the anomaly is analyzed.Secondly,the FSM is applied to the leakage detection of Dahu Reservoir in Nan'an City,Fujian Province,and the relationship between measured curves and the forward calculation curves is discussed.The research results show that the field measured curves are similar to the theoretical curves,which shows that the anomaly of FSM is mainly caused by the secondary electric field component of natural electromagnetic field.At the same time,the borehole verification results show that FSM is one of the effective methods to detect shallow low resistivity bodies.

关 键 词：渗漏 天然电场选频法 有限单元法 工程地质 水库 

分 类 号：P641.7[天文地球—地质矿产勘探]