可移动式超音频快速电磁勘探技术研究  

Research on Mobile Ultrasonic Rapid Electromagnetic Exploration Technology

作　　者：阮宏宇 王猛[1,2] 林祖灿 张袭远 王心畅 周珂宇 张辉[1,2] 张魁元[1,2] 张荣薄 汪永青 张启升 RUAN Hongyu;WANG Meng;LIN Zucan;ZHANG Xiyuan;WANG Xinchang;ZHOU Keyu;ZHANG Hui;ZHANG Kuiyuan;ZHANG Rongbo;WANG Yongqing;ZHANG Qisheng(Key Laboratory of Intraplate Volcanoes and Earthquakes(China University of Geosciences(Beijing)),Ministry of Education,Beijing 100083,China;School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]陆内火山与地震教育部重点实验室(中国地质大学(北京)),北京100083 [2]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《现代地质》2025年第2期514-522,共9页Geoscience

基　　金：国家重点研发计划课题项目(2022YFF0706202)。

摘　　要：可控源射频大地电磁法(controlled source radio magnetotelluric method,CSRMT)是一种新型的频率域近地表电磁测深技术。该方法基于传统的大地电磁法(magnetotelluric,MT),通过设置人工发射源,并在远距离处观测电磁场的各个分量,从而推断地下结构。本文提出的可移动式超音频快速电磁勘探技术基于可控源射频大地电磁法(CSRMT),它可以利用广播电台发射的AM信号、VLF海军电台发射的甚低频电磁信号、国家授时中心发射的电磁信号这些已有的人工场源进行电磁勘探,可通过运载车装配超音频可控源电磁接收机进行移动式勘探,不需要像传统的CSMT中那样现场布置人工场源,可使勘探效率大幅提升,节约了布置和维护发射机的勘探成本。本项技术中所研发可移动式超音频可控源电磁接收机的带宽范围达到1 Hz~600 kHz,采样率高达2.5 MHz,动态范围达到138 dB,视电阻率测量精度优于3%。The controlled source radio magnetotelluric method(CSRMT) is an innovative frequency-domain electromagnetic sounding technique designed for near-surface exploration.Building upon the traditional Magnetotelluric(MT) method,CSRMT employs an artificial transmitter source and measures various components of the electromagnetic field at a distance to infer subsurface structures.This paper introduces a mobile ultra-high-frequency rapid electromagnetic exploration technology based on CSRMT.This technology leverages existing artificial field sources,such as AM signals from radio broadcast stations,very low frequency(VLF) electromagnetic signals from naval communication stations,and electromagnetic signals from national time service centers,to conduct electromagnetic surveys.By equipping a vehicle with an ultra-high-frequency controlled-source electromagnetic receiver,mobile exploration can be achieved without on-site deployment of artificial field sources,as required in traditional Controlled Source Magnetotellurics(CSMT).This significantly enhances exploration efficiency and reduces the costs associated with deploying and maintaining transmitters.The mobile ultra-high-frequency controlled-source electromagnetic receiver developed for this technology features a bandwidth range of 1 Hz to 600 kHz,a sampling rate of up to 2.5 MHz,a dynamic range of 138 dB,and an apparent resistivity measurement accuracy better than 3%.

关 键 词：可控源射频大地电磁法 电磁接收机 FPGA 视电阻率 

分 类 号：P631.2[天文地球—地质矿产勘探] P631.3[天文地球—地质学]