高密度电阻率法在岩溶探测中的应用  

Application of multi-electrode resistivity method in karst exploration

作　　者：沈航锐 周彪华 蓝泽鸾 李文鑫 Shen Hangrui;Zhou Biaohua;Lan Zeluan;Li Wenxin(School of Geophysics and Measurement-control Technology,East China University of Technology,Nanchang,Jiangxi 330013;Jiangxi Hydraulic Safety Engineering Technology Research Center,Nanchang,Jiangxi 330029;Geological Environment Monitoring Institute of Jiangxi Provincial Geological Survey and Exploration Institute,Nanchang,Jiangxi 330029)

机构地区：[1]东华理工大学地球物理与测控技术学院,江西南昌330013 [2]江西省水工安全工程技术研究中心,江西南昌330029 [3]江西省地质调查勘查院地质环境监测所,江西南昌330029

出　　处：《资源环境与工程》2024年第3期346-352,共7页Resources Environment & Engineering

基　　金：江西省水利科学院开放研究基金项目“基于电性三参数的堤坝渗漏通道勘探技术及应用”(2022SKSG01)。

摘　　要：针对某工区面临岩溶塌陷危害的问题,选用高密度电阻率法进行岩溶探测。首先基于实际地质资料建立工区溶洞地电模型,对地电模型的响应特征作分析;然后在工区部署多条测线,对实测数据进行二维反演,并与钻孔资料进行比对,查明工区地层信息和溶洞分布情况。通过高密度电阻率法探测,可以区分工区浅部粉质黏土层+深部灰岩层的二元结构地层;在灰岩层顶部发现了2处全充填溶洞,表现为显著的低阻异常特征。该案例表明高密度电阻率法具有采集数据量大、效率高、成本低等特点,是可靠的岩溶探测方法。Aiming at the problem of karst collapse hazard in a working area,multi-electrode resistivity method is used to explore karst.Firstly,based on the actual geological data,the geoelectric model of the karst cave in the work area is established,and the response characteristics of the geoelectric model are analyzed.Then,multiple survey lines are deployed in the work area to carry out two-dimensional inversion of the measured data and compare with the borehole data to find out the stratigraphic information and karst cave distribution in the work area.Through the exploration of multi-electrode resistivity method,the binary structure strata of shallow silty clay layer+deep limestone layer in the work area are effectively distinguished.Two fully-filled karst caves are found at the top of the limestone layer,showing significant low-resistivity anomalies.The multi-electrode resistivity method is a reliable karst exploration method with the characteristics of large amount of data collection,high efficiency and low cost.

关 键 词：高密度电阻率法 岩溶探测 地电模型 二维反演 

分 类 号：P631.322[天文地球—地质矿产勘探] P642.25[天文地球—地质学]