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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第44卷

期数:

2022年第05期

页码:

860-869

栏目:

应用地球物理

出版日期:

2022-09-15

文章信息/Info

Title:

One-dimensional Forward and Inversion for an Arbitrary Point of Horizontal Large-loop Fixed Source Transient Electromagnetism

文章编号:

1672-6561(2022)05-0860-10

作者:

石金晶¹; 2; 3; 薛国强¹; 2; 3; 4*; 陈卫营¹; 2; 3; 武欣¹; 2; 3

(1. 中国科学院地质与地球物理研究所 中国科学院矿产资源研究重点实验室,北京 100029; 2. 中国科学院地球科学研究院,北京 100029; 3. 中国科学院大学 地球与行星科学学院,北京 100049; 4. 西北有色地质矿业集团有限公司,陕西 西安 710054)

Author(s):

SHI Jin-jing¹; 2; 3;  XUE Guo-qiang¹; 2; 3; 4*;  CHEN Wei-ying¹; 2; 3;  WU Xin¹; 2; 3

(1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Innovation Academy of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 4. Northwest Nonferrous Geology and Mining Group Co., Ltd., Xi'an 710054, Shaanxi, China)

关键词:

瞬变电磁法;  大定源回线装置;  OCCAM算法;  电偶极子合成;  任意点;  一维反演

Keywords:

transient electromagnetic method;  large-loop fixed source device;  OCCAM algorithm;  electric dipole synthesis;  arbitrary point;  one-dimensional inversion

分类号:

P319.3⁺2; P631.3

DOI:

10.19814/j.jese.2021.12029

文献标志码:

A

摘要:

大定源回线装置是瞬变电磁法(TEM)的一种工作装置,在框内外皆可进行观测,探测深度大、施工效率高。但受传统中心回线装置数据处理方式限制,当前大定源回线装置仅在发射线框中心一定区域内观测信号。基于电偶极子叠加方式,实现了发射线框内外任意位置电磁场的精确计算,并基于此分析了大定源回线装置产生的一次场和二次场的分布与扩散特征; 随后利用OCCAM算法对发射线框内外任意点的响应进行一维反演,并通过一维层状模型对该方法的有效性进行了验证。结果表明,采用本文提出的正反演方法可以实现大定源回线装置发射线框内外任意点地下电性结构的准确反演。最后,将本文提出的正反演方法用于湖北省荆州市某机场的实测大定源回线装置实测数据处理中,取得了可靠的成果。

Abstract:

Large-loop fixed source device is an equipment of transient electromagnetic method(TEM). It can be observed inside and outside the frame, with a large detection depth and high construction efficiency. However, limited by the traditional data processing method using the central loop device, the current large-loop fixed source device only observes the signal in a certain area in the center of the transmitting wireframe. Based on the superposition of electric dipoles, the accurate calculation of the electromagnetic field at arbitrary position inside and outside the transmitting frame was realized. Furthermore, the distribution and diffusion characteristics of the primary and secondary fields generated by the large-loop fixed source were analyzed. Then, the one-dimensional inversion of arbitrary point inside and outside the frame using the OCCAM algorithm was implemented, and the feasibility was verified by a layered model. The results show that the proposed method can accurately inverse the underground electrical structure at arbitrary point inside and outside the large-loop fixed source frame. Finally, the proposed method was applied to process the measured data from one airport in Jingzhou city of Hubei province, and the results are reliable.

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　XUE Guo-qiang,YAN Shu,DI Qing-yun,et al.Technical Analysis of Multi-transient Electromagnetic Method[J].Journal of Earth Sciences and Environment,2015,37(05):94.
[2]雷康信,薛国强*,陈卫营,等.瞬变电磁法探测薄层的分辨能力与偏移距关系[J].地球科学与环境学报,2020,42(06):731.[doi:10.19814/j.jese.2020.07044]
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备注/Memo

备注/Memo:

收稿日期:2021-12-17; 修回日期:2022-06-01投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(42010306,41704076); 中国科学院仪器设备研制项目(YJKYYQ20190004); 第二次青藏高原综合科学考察研究专题(2019QZKK0804); 自然资源部煤炭资源勘查与综合利用重点实验室开放项目(KF2020-3)
作者简介:石金晶(1998-),女,湖南岳阳人,中国科学院大学理学硕士研究生,E-mail:shijinjing20@mails.ucas.ac.cn。
*通讯作者:薛国强(1966-),男,山西运城人,中国科学院地质与地球物理研究所研究员,博士研究生导师,理学博士,E-mail:ppxueguoqiang@163.com。

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更新日期/Last Update: 2022-10-01