李貅^1,,
胡伟明¹,
薛国强^2,3,4,5,,
1. 长安大学地质工程与测绘学院, 西安 710054
2. 中国科学院矿产资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029
3. 中国科学院大学地球与行星科学学院, 北京 100049
4. 中国科学院地球科学研究院, 北京 100029
5. 西北有色地质矿业集团有限公司, 西安 710054

基金项目: 国家自然科学基金重点项目（41830101，42030106），国家自然科学基金面上基金项目（42074121），中国科学院科研仪器设备研制项目（YJKYYQ20190004）和自然资源部煤炭资源勘查与综合利用重点实验室开放课题（KF2020-3）联合资助


详细信息

作者简介: 李貅, 长安大学教授, 主要从事电磁法理论方研究.E-mail:lixiu@chd.edu.cn

通讯作者: 薛国强, 中国科学院地质与地球物理研究所研究员, 主要从事瞬变电磁法研究与应用研究.E-mail:xueguoqiang@mail.iggcas.ac.cn

中图分类号: P631

收稿日期:2020-05-04
修回日期:2020-12-09
上线日期:2021-02-10

3D modeling of multi-radiation source semi-airborne transient electromagnetic response

LI Xiu^1,,
HU WeiMing¹,
XUE GuoQiang^2,3,4,5,,
1. School of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China
2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
5. Northwest Geological and Mining Group Limited Company for Nonferrous Metals, Xi'an 710054, China


More Information

Corresponding author: XUE GuoQiang,E-mail:xueguoqiang@mail.iggcas.ac.cn

MSC: P631

--> Received Date: 04 May 2020
Revised Date: 09 December 2020
Available Online: 10 February 2021


摘要
摘要:地空瞬变电磁法结合地面和航空电磁法的优点，可实现探测深度和工作效率的平衡.当前地空瞬变电磁法采用单一线源激发电磁辐射场，仅能从一个侧面与地质体耦合，难以获得地质体的全息影像.采用多辐射源是解决这一问题的途径.本文采用三维矢量有限元法对两个不同地质体多个辐射源情况下的地空瞬变电磁响应开展了模拟研究，分析了多辐射源在不同辐射方向、不同飞行高度电磁响应的分布特征.研究表明，由多辐射场源作为地空电磁法的发射源，通过分散布设的线源，可以在地下激发与地质体多方位耦合的电磁场，能够获得地下地质体多方位不同高度情况下的耦合信息.同时，多辐射场源能够增强源电磁场的辐射强度，减少单一线源体积效应影响，飞行高度较低时可获得较强的响应幅值，研究结果为多辐射地空瞬变电磁法深部精细探测提供理论依据.
关键词: 地空瞬变电磁法/
多辐射源/
飞行高度/
三维响应/
模拟

Abstract:Combining the advantages of ground electromagnetic and airborne electromagnetic method, the semi-airborne transient electromagnetic method can reach the balance between detection depth and working efficiency. Normally, the electromagnetic field excited by a single line source can only identify the geological body from one side, and is difficult to acquire the full image of the subsurface geologic body. Adopting multi-radiation sources is the way to solve this problem. The three-dimensional vector finite element method is used to perform forward of the electromagnetic response for two geological bodies under multi-radiation sources, and analyze the response distribution of the electromagnetic field from different sources at different flight altitudes. Results show that the multi-radiation sources can enhance the radiation intensity of the electromagnetic field, reduce the volume effect of the single-line electrical source, and obtain a strong response amplitude at a low flight height, which provides a theoretical basis for the fine detection using the multi-radiation source semi-airborne transient electromagnetic method.
Key words:Semi-airborne transient electromagnetic method/
Multi-radiation source/
Flight altitude/
3D response/
Modeling



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