输卤渠渗漏电法勘探有效性分析  

Effectiveness of the electrical prospecting in detecting the leakage of the brine channel

作　　者：程辉[1] 王丹齐 李帝铨[2] 杨天春[1] 廖秀英[1] 付国红[1] CHENG Hui;WANG DanQi;LI DiQuan;YANG TianChun;LIAO XiuYing;FU GuoHong(University of Science and Technology of Hunan,Xiangtan 411201,China;School of Geosciences and InfoPhysics,Central South University,Changsha 410083,China)

机构地区：[1]湖南科技大学,湘潭411201 [2]中南大学地球科学与信息物理学院,长沙410083

出　　处：《地球物理学进展》2022年第4期1717-1723,共7页Progress in Geophysics

基　　金：国家重点研发计划项目(2018YFC0603900);国家自然科学基金(42074219);湖南省自然科学基金项目(2021JJ30241)联合资助。

摘　　要：在罗布泊钾盐矿输卤渠渗漏勘测工作中,存在极其恶劣工况条件与研究区内电性差异较小的主要问题,现今没有针对在此背景下的研究,在此研究背景下采用有限元法对直流电阻率法对称四极装置进行模拟计算,对不同异常体所产生的曲线进行比对分析.综合前期地质调查基础数据,建立相应地质-地球物理模型,并对异常区域进行合理的精细剖分.正演模拟计算结果显示:在电阻率为0.5Ω·m的背景场中,异常体电阻率为1Ω·m,异常体体积为0.5 m3的条件下,使用电极距为AB=20 m,MN=2 m的对称四极装置,模拟结果得到1%相对异常精度;不同装置电极距所产生的异常曲线不同.通过计算表明电阻率法对称四极装置在罗布泊钾盐矿输卤渠的实际条件下,其理论上可以进行渗漏勘测工作.As the Lop Nur potash mine has small electrical potential differences between lithology and extremely harsh working conditions,detecting the leakage of the brine channel is difficult.This study proposes to model the symmetrical Schlumberger array of the direct current resistivity by the resistivity finite element method,the curves produced by different anomalous bodies were compared and analyzed.We collect the geological information,establish a geological-geophysical model,and finely subdivide the abnormal area.The forward modeling results show that,with the background field resistivity of 0.5Ω·m,the abnormal body resistivity of 1Ω·m,and the abnormal body volume of 0.5 m3,the simulated abnormal value has a relative accuracy of 1%when the Schlumberger array has the electrode distance AB=20 m and MN=2 m.In addition,different electrode distances lead to different abnormal value curves.The numerical experiment shows that the Schlumberger array can detect the leakage of the brine channel in the Lop Nur potash mine theoretically.

关 键 词：地球物理 渠道渗漏 数值模拟 电法 有限元 

分 类 号：P631[天文地球—地质矿产勘探]