基于污染场地模型的高密度电阻率法数值模拟分析  

Numerical simulation analysis of high-density resistivity method based on contaminated site modeling

作　　者：田少兵 宋梦馨 梅荣[1] 代小强 TIAN Shaobing;SONG Mengxin;MEI Rong;DAI Xiaoqiang(Geological Survey of Jiangsu Province,Nanjing 210049,China;Sinopec Geophysical Company materials and equipment center,Nanjing 211100,China;Nanjiang Hydrogeologic Team,Chongqing Geological Engineering Investigation Institute,Chongqing 410047,China)

机构地区：[1]江苏省地质调查研究院,南京210049 [2]中石化地球物理公司物资装备中心,南京211100 [3]重庆市地勘局南江水文地质工程地质队,重庆410047

出　　处：《物探化探计算技术》2025年第2期253-271,共19页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：江苏省地质调查研究院2024年度科技发展基金科技引导项目(苏地调院[2024]69号);深部含水层储气库探测方法技术评价项目(2024ZD1004103)。

摘　　要：随着我国产业转型与城市化进程的加快,许多化工类企业迁移后留下了潜在的污染场地。高密度电阻率法在污染场地调查及监测中发挥越来越重要的作用,然而由于其装置类型多样,如何选择合理有效的装置类型对勘查效果至关重要。笔者基于污染场地的常见类型,采用高密度电阻率法构建了有机和无机污染物在地下地层中的单体、水平平行、垂直平行、低阻屏蔽、随机分布和扩散模型,应用三种常用装置进行了二维正演模拟和反演计算。通过对比,发现针对实际的污染场地,最小可识别污染体至少要大于两倍以上电极距,且深度越深识别精度越差。在特定条件下,偶极-偶极装置勘探效果明显优于其它装置,尤其对异常体横向边界的识别精度更高。本研究所开展的高密度电阻率模拟实验对于在污染场勘查,选择何种装置类型以及提升解释人员对异常体的识别具有借鉴意义。With the accelerated industrial transformation and urbanization in China,the relocation of many chemical companies has left behind potentially polluted sites.The high-density resistivity method is increasingly important in investigating and monitoring polluted sites.However,due to the variety of device types,there are advantages and disadvantages to various devices,so choosing a reasonable and effective type of device is crucial to the effectiveness of the survey.Based on the common characteristics of contaminated sites,monolithic,horizontally parallel,vertically parallel,low-resistance shielding,stochastic distribution,and diffusion models of organic and inorganic contaminants in the subsurface strata were constructed using the high-density resistivity.Two-dimensional orthogonal simulations and inverse calculations were carried out by using three commonly used devices.Through comparison,it is found that for actual contaminated sites,the minimum recognizable contaminated body must be at least twice as large as the electrode distance,and the deeper the depth,the worse the recognition accuracy.Under specific conditions,the dipole-dipole device exploration effect is significantly better than that of other devices,especially for the lateral boundary of the anomaly body recognition accuracy,which is higher.The high-density resistivity simulation experiments carried out in this study have implications for surveying in contaminated sites,choosing which type of device to use,and improving the identification of anomalies by interpreters.

关 键 词：污染场地调查 高密度电阻率法 二维数值建模 温纳装置 偶极-偶极装置 温纳-斯伦贝谢装置 

分 类 号：P631.322[天文地球—地质矿产勘探]