基于双电性源的磁共振地下水探测技术数值模拟与特征分析  

Three-dimensional numerical simulation and analysis of magnetic resonance sounding with double electrical sources for groundwater exploration

作　　者：林小雪[1,2] 韦萌 常天琦 林婷婷 LIN XiaoXue;WEI Meng;CHANG TianQi;LIN TingTing(College of Instrumentation and Electrical Engineering,Jilin University,Changchun 130026,China;Key Laboratory of Geo-Exploration and Instrumentation,Ministry of Education,Changchun 130026,China)

机构地区：[1]吉林大学仪器科学与电气工程学院,长春130026 [2]地球信息探测仪器教育部重点实验室,长春130026

出　　处：《地球物理学报》2025年第3期1174-1185,共12页Chinese Journal of Geophysics

基　　金：深地国家科技重大专项(2024ZD1002901);国家自然科学基金(42304156,42330803,U21A2020);吉林省教育厅科学研究项目(JJKH20250090KJ);中国博士后科学基金项目(2022M711292)联合资助。

摘　　要：磁共振测深技术具备定性、定量获取地下水分布信息以及针对性强等优势,被广泛应用于野外水资源勘察以及工程性危害水源预警等领域.近年来,随着城市地下空间的逐渐开发和利用,城市地下水的探测需求越来越迫切.基于传统磁性源的地面磁共振地下水探测方法已趋于成熟,但由于其存在磁性回路覆盖面积大、响应信号振幅低等问题而无法在高噪声的城市环境中开展应用.针对以上问题,本文提出利用双电性源代替传统大规模磁性源回路,以解决环境适应性问题;推导空间磁场表达式,构建核函数,获取强振幅正演响应,以解决信号幅值低的问题;建立反向脉冲和同向脉冲双电性源激发模型,以讨论最佳双源装置;设置不同收发距和百米级深水案例,以探索收发参数对城市深水场景的探测潜力.经深入分析得知,同向脉冲双电性源装置能够获取远超于反向脉冲双电性源、单电性源以及传统磁性源的磁场覆盖距离、灵敏度核函数辐射深度以及深水信号感应强度.结果证明,本文所提出的双电性源磁共振探测方法具有地形适应性好、探测灵敏度高以及激发深度大等绝对优势,能够极大地拓宽磁场覆盖范围,从方法上突破传统磁性源探测弊端,具备纵深聚焦揭示深部异常体的能力.本文的研究结论为打破传统磁共振探测的瓶颈深度、以及推进城市环境下的磁共振地下水探测进程提供了理论基础.Magnetic resonance sounding(MRS)has the advantages of qualitative and quantitative acquisition of groundwater distribution information and strong pertinence,so it is widely used in field water resources investigation and engineering disasters warning caused by water.In recent years,with the gradual development and utilization of underground space in cities,the need for urban groundwater detection has become more urgent.Surface MRS groundwater detection method based on conventional magnetic sources has become mature,but it is not applicable in urban environments due to the problems of large coverage area of magnetic loops and the low amplitude of the response signal.In this paper,we propose to replace the conventional large-scale magnetic source with double electrical sources in order to solve the environmental adaptation problem.To solve the problem of low amplitude of the signal,the spacial magnetic field expression is derived and the kernel function is constructed to obtain the strong amplitude forward response.In order to discuss the optimal double electrical sources device,excitation models using inverse and same pulses have been developed.Deep water cases below the 100 m level with different transceiver distances are set to explore the detection potential of transceiver parameters for urban deep water scenarios.Through in-depth analysis,it is known that the magnetic field coverage distance,radiation depth of sensitivity kernel function and deep water signal induction intensity of the double electrical sources device with the same pulses are far higher than those of the double sources with the inverse pulses,the single electrical source and the traditional magnetic source.The results show that the proposed new method of MRS with double electrical sources has the absolute advantages of good terrain adaptability,high detection sensitivity and large excitation depth,which can greatly broaden the magnetic field coverage,break through the drawbacks of traditional magnetic source detection methods,and have the abil

关 键 词：电性源 磁共振 双源 信号增强 

分 类 号：P631[天文地球—地质矿产勘探]