Mathematical simulation of pulsed electromagnetic soundings with a spatially distributed system of deviated wells

2020 ◽  
Author(s):  
Viacheslav N. Glinskikh ◽  
◽  
Oleg V. Nechaev ◽  
Alexander R. Dudaev ◽  
◽  
...  
Keyword(s):  
Time Discretization ◽  
Discrete Analogue ◽  
Physical Parameters ◽  
Field Source ◽  
Vector Finite Element Method ◽  
Electromagnetic Soundings ◽  
Spatially Distributed ◽  
Vector Finite Element ◽  
Spatial Coordinates ◽  
Pulsed Electromagnetic

We have developed a mathematical model describing the sounding process with a pulsed electromagnetic field source in a 3D region complex in physical parameters and geometric structure. For its time discretization, the time Fourier transform is used. Through the vector finite element method, we have obtained a discrete analogue in spatial coordinates of the original problem. The simulation examples are provided.

scholarly journals NUMERICAL SOLVING THREE-DIMENSIONAL DIRECT PROBLEM OF PULSED ELECTROMAGNETIC CROSS-WELL EXPLORATION FOR CRYOLITHOZONE MONITORING

2021 ◽  
Vol 2 (2) ◽  
pp. 181-185
Author(s):  
Oleg V. Nechaev ◽  
Kirill N. Danilovskiy
Keyword(s):  
Mathematical Model ◽  
Finite Element Method ◽  
Finite Element ◽  
Direct Problem ◽  
Geophysical Methods ◽  
Three Dimensional ◽  
Spatially Inhomogeneous ◽  
Vector Finite Element Method ◽  
Vector Finite Element ◽  
Pulsed Electromagnetic

The article is devoted to the problem of studying permafrost state and the processes of its geocryological changes using geophysical methods. To monitor the cryolithozone, a method of pulsed electromagnetic cross-well sounding is proposed. On the basis of the vector finite element method, a mathematical model of the cross-well sounding process by a pulsed source in a three-dimensional spatially inhomogeneous medium has been created.

scholarly journals Pulsed Electromagnetic Cross-Well Exploration for Monitoring Permafrost and Examining the Processes of Its Geocryological Changes

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 60
Author(s):  
Viacheslav Glinskikh ◽  
Oleg Nechaev ◽  
Igor Mikhaylov ◽  
Kirill Danilovskiy ◽  
Vladimir Olenchenko
Keyword(s):  
High Performance ◽  
Geophysical Methods ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Data Interpretation ◽  
Industrial Facilities ◽  
Wide Range ◽  
Vector Finite Element ◽  
A New Technique ◽  
Pulsed Electromagnetic

This paper is dedicated to the topical problem of examining permafrost’s state and the processes of its geocryological changes by means of geophysical methods. To monitor the cryolithozone, we proposed and scientifically substantiated a new technique of pulsed electromagnetic cross-well sounding. Based on the vector finite-element method, we created a mathematical model of the cross-well sounding process with a pulsed source in a three-dimensional spatially heterogeneous medium. A high-performance parallel computing algorithm was developed and verified. Through realistic geoelectric models of permafrost with a talik under a highway, constructed following the results of electrotomography field data interpretation, we numerically simulated the pulsed sounding on the computing resources of the Siberian Supercomputer Center of SB RAS. The simulation results suggest the proposed system of pulsed electromagnetic cross-well monitoring to be characterized by a high sensitivity to the presence and dimensions of the talik. The devised approach can be oriented to addressing a wide range of issues related to monitoring permafrost rocks under civil and industrial facilities, buildings, and constructions.

The Application of Ground-airborne TEM Systems for Underground Cavity Detection in China

2018 ◽  
Vol 23 (1) ◽  
pp. 103-113
Author(s):  
Guo-qiang Xue ◽  
Xiu Li ◽  
Sheng-bao Yu ◽  
Wei-ying Chen ◽  
Yan-ju Ji
Keyword(s):  
Three Dimensional ◽  
Field Measurements ◽  
Cavity Detection ◽  
Vector Finite Element Method ◽  
Military Applications ◽  
Vector Finite Element ◽  
Survey Results ◽  
Tem Method ◽  
Central Loop ◽  
Good Agreement

Ground-based, electrical-source, and UAV-borne receiver TEM configurations have previously been used to map mines in Jiangsu Province, China. In this study, the EM responses of air-filled mine tunnels were simulated by using a three-dimensional (3D) vector finite element method. A new apparent resistivity formula has been proposed for the ground-airborne TEM configuration. In the study area, field measurements were carried out along 36 profiles for the ground-airborne TEM and 16 profiles for ground TEM. The ground-airborne TEM results were determined to be in good agreement with the ground TEM survey results using a surface central loop, and were also consistent with the known geologic conditions. The experiment was successful and showed that a ground-ground-airborne TEM method could potentially become a novel alternative for both future civilian and military applications. [Figure: see text]

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