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| Inverse wavefield transform method for opposing coils transient electromagnetic data and its application in ahead prospecting in the lead-zinc mine at Huize |
| LI Lianran1, REN Zhouhong1, WANG Bin1, ZHANG Quan1, HUANG Hao1, LIU Jijin1, XU Haoyu1, GUO Qian2
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1. Technical and Engineering Branch of Yunnan Chihong Zn &
Ge Co., Ltd., Qujing 654212, Yunnan, China;
2. School of Future Technology, Shandong University, Jinan 250002, Shandong, China |
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Abstract In the Huize lead-zinc mine, the surrounding rocks are mainly weakly karstified carbonate rocks. Structures such as fault fracture zones, joints, fissures, and karsts in the mining area were relatively developed,which provided sufficient space and channels for the enrichment and migration of groundwater. The water inrush during the tunneling and mining processes was characterized by high water pressure and large flow. Therefore, advanced detection of water-bearing structures was urgently required. In response to the above problems, the equivalent anti-flux transient electromagnetic method was selected, combined with geological and drilling data to carry out advanced detection work at the 1 104 m and 924 m levels in the mining area. Based on the obtained resistivity profiles, an adaptive wavefield inverse transformation method was proposed to transform the equivalent anti-flux transient electromagnetic data into a pseudo-wavefield sensitive to electrical interfaces, enabling qualitative characterization of the strata's electrical structure.Prior to underground detection, sounding comparison tests and air attenuation tests were conducted to evaluate the maximum detection depth and signal attenuation in air. By using a transmission fundamental frequency of 2.5 Hz, ideal detection results were achieved in the mining area, demonstrating the effectiveness and reliability of the equivalent anti-flux transient electromagnetic method and the wavefield inverse transformation.
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Published: 18 June 2025
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