FDTD numerical simulation and application research of small-loop transient electromagnetic method in shallow water

Xu, Zhengyu; Fu, Nengyi; Liu, Longhuan; Fu, Zhihong

doi:10.1016/j.jappgeo.2021.104467

Cited by 10 publications

(1 citation statement)

References 22 publications

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“…Traditional transient electromagnetic method (TEM) is commonly used in ground exploration and in tunnels, employing large-scale transceiver devices for extensive deep exploration [7][8][9][10]. Ground half-space borehole TEM (BTEM) research began in the mid-1980s.…”

Section: Introductionmentioning

confidence: 99%

Borehole transient electromagnetic response calculation and experimental study in coal mine tunnels

Sun,

Ding,

Sun

et al. 2024

Meas. Sci. Technol.

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Water damage seriously threatens the safe production of coal mines, so it is necessary to carry out advanced detection to determine the hydrogeological situation, and the preliminary survey often involves the drilling of on-site drill holes in the tunnel. The use of directional drill holes, combined with advanced geophysical prospecting technology, enables advanced water disaster detection with long distance and high precision and is independent of the tunnel environment influence. The transient electromagnetic method is highly sensitive to low-resistivity anomalies and plays a crucial role in water damage detection. To address the size limitation of borehole detection, in this study, a small rectangular multi-turn loop borehole advanced detection method was developed (borehole transient electromagnetic method, BTEM) to detect low-resistivity anomalies within 10 m of the borehole in the radial direction. To satisfy the size requirements for borehole detection and the detection distance, a small rectangular multi-turn loop device with a width of 6 cm and a length of 50 cm was designed. To resolve the issue of self-inductance and mutual inductance enhancement caused by multi-turn coils, a uniform full-space low-resistivity abnormal body model was established using the Ansys Maxwell software, and we analyzed the vertical magnetic field component of the rectangular multi-turn small loop at different time points and the transient electromagnetic response of the different turns. Then, we determined the appropriate parameters for the transmitting and receiving device. The developed method was applied to several different experimental scenarios to obtain the electrical distribution of the anomalous body in front of the device, and the measured data were inverted and interpreted to obtain the apparent resistivity-depth profile. The results demonstrate that the inversion results align well with the actual situation, confirming the effectiveness of the BTEM.

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Section: Introductionmentioning

confidence: 99%