|Table of Contents|

Three-dimensional Numerical Simulation of Diffusion Law of Short-offset Grounded-wire Transient Electromagnetic Field(PDF)

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

Issue:
2020年第06期
Page:
711-721
Research Field:
电磁法勘探专辑
Publishing date:

Info

Title:
Three-dimensional Numerical Simulation of Diffusion Law of Short-offset Grounded-wire Transient Electromagnetic Field
Author(s):
CHANG Jiang-hao1; 2; 3; 4;  XUE Guo-qiang1; 2; 3; 5*
1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3. Innovation Academy of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 4. Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, Hebei, China; 5. Integrated Geophysical Simulation Lab(Key Laboratory of Chinese Geophysical Society), Chang'an University, Xi'an 710054, Shaanxi, China
Keywords:
geophysics;  transient electromagnetic method;  grounded-wire;  short-offset;  numerical simulation;  three-dimensional anomalous body;  diffusion law;  forward modeling
PACS:
P631
DOI:
10.19814/j.jese.2020.07048
Abstract:
Short-offset grounded-wire transient electromagnetic method(SOTEM)has considerably improved the signal intensity by using the form of near-source detection. The present researches on SOTEM responses are mainly based on 1D models and explore the response characteristics and detection abilities of two components: electric field Ex and magnetic field Hz, which are not conducive to the accurate exploration of complex targets. Based on the above-mentioned problems, a three-dimensional(3D)finite-difference time-domain(FDTD)was employed to simulate the diffusion pattern of SOTEM field in strata and the influence of 3D anomalous body on the diffusion of SOTEM field. The results show that the positive extreme value area of electric field Ex component mainly appears nearby the transmitting source, and diffuses gradually downward with time; the positive extreme value area and negative extreme value area of electric field Ey component are mainly located at two ends of the transmitting source, and diffuse gradually downward and outward with time; the electric field Ez component undergoes jump at strata boundary; the positive extreme value area and negative extreme value area of magnetic field Hx component are respectively located at two ends of the transmitting source, and diffuse gradually downward and outward with time; the upper part and lower part of magnetic field Hy component are negative value area and positive value area, respectively, indicating that Hy component will also be affected by the return current; the extreme value area of magnetic field Hz component is mainly below the transmitting source, and gradually moves downward with time; for the 3D anomalous body, the sensitivity areas of electric field Ex and magnetic field Hy components are rightly above the anomalous body, while the sensitivity areas of electric field Ey and magnetic field Hx components are outside the anomalous body and distribute around it, and the sensitivity areas of magnetic field Hz component are on both sides of the anomalous body(close to transmitting source, and distant from transmitting source, respectively). It shows that the five components of SOTEM field have different sensitivity areas to the 3D anomalous body, and different components should be observed in different areas.

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Last Update: 2020-12-20