不同深度岩溶管道的高密度电阻率法反演特征  

Inversion characteristics of high-density resistivity method on karst conduits at varied depths

作　　者：郑智杰[1] 甘伏平[1] 曾洁[1] 

机构地区：[1]中国地质科学院岩溶地质研究所/国土资源部广西壮族自治区岩溶动力学重点实验室,广西桂林541004

出　　处：《中国岩溶》2015年第3期292-297,共6页Carsologica Sinica

基　　金：中国地质科学院岩溶地质研究所所控项目(编号:121237128100244)

摘　　要：高密度电法在岩溶区找水具有很好的效果，岩溶山区岩溶管道深度各异，为了探寻岩溶管道深度变化下高密度电阻率的响应规律，本文以高密度电阻率法原理为基础，采用高密度电阻率法微测系统，利用铜柱体模型，模拟均匀介质下不同深度岩溶管道的高密度电阻率响应特征。结果表明：当岩溶管道深度大于15倍电极距时，矩形 AMN 装置和滚动 MNB 装置未能探测到该深度的岩溶管道；当岩溶管道深度小于10-11倍电极距时，矩形 AMN 和滚动 MNB 装置联合能较精准地定位岩溶管道在平面上的投影位置；岩溶管道反演异常的横向宽度始终大于真实异常横向宽度，反演异常顶部埋深小于或等于真实异常顶部埋深，且岩溶管道深度越浅，反演异常体的形态、大小、埋深越接近真实异常；随岩溶管道深度的增加，岩溶管道的矩形 AMN 装置和滚动 MNB 装置异常反演形态由椭圆向半椭圆、弓形变化，直至消失。The high-density resistivity method is effective in searching for water in karst areas.As karst con-duits in mountainous areas are at different depths,it is necessary to study the characteristics and rules of this method in such an environment.This work is based on the principle of the high-density electrical method. Using a high-density micro-electrical measurement system and the copper cylinder model,it simulates the re-sponse characteristics of the high-density resistivity method for different depths of karst conduits in a homo-geneous medium.The results indicate that when the depth of karst conduits exceeds 15 times of the electrode spacing,the AMN and the MNB device cannot detect these conduits.When the depth of karst conduits is less than 10 to1 1 times of the electrode spacing,the combination of the AMN device and MNB device can precisely locate the horizontal position of the karst conduits.The transverse width of karst conduit inversion anomalies are always greater than the transverse width of the true anomalies.The buried depth of inversion anomalies are less than or equal to the true ones.And the shallower of the karst conduits,the closer of the inversion of anomaly body shape,size,and depth to the true anomalies.With the increasing of the depth of karst conduits,the forms of AMN device and MNB device inversion anomalies change from ellipse to semi-el-lipse,then to bow till they disappear.

关 键 词：高密度电阻率法微测系统 电极距 岩溶管道深度 物理模拟试验 

分 类 号：P631.3[天文地球—地质矿产勘探]