|Table of Contents|

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

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

Issue:
2022年第05期
Page:
860-869
Research Field:
应用地球物理
Publishing date:

Info

Title:
One-dimensional Forward and Inversion for an Arbitrary Point of Horizontal Large-loop Fixed Source Transient Electromagnetism
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)
Keywords:
transient electromagnetic method;  large-loop fixed source device;  OCCAM algorithm;  electric dipole synthesis;  arbitrary point;  one-dimensional inversion
PACS:
P319.3+2; P631.3
DOI:
10.19814/j.jese.2021.12029
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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Last Update: 2022-10-01