Full Waveform Inversions of Borehole Transient Electromagnetic Virtual Wave Fields and Potential Applications

IF 1 4区 工程技术 Q4 ENGINEERING, GEOLOGICAL
Fan Tao, Qin Zhipeng, Yan Bin, Zhao Zhao, Wang Bingchun, Shi Xianxin, Liu Lei, Zhao Rui, Wang Ji-kuang, Li Bofan, Fang Zhe
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引用次数: 0

Abstract

The transient electromagnetic method (TEM) for boreholes uses fixed source loops to launch at excavation faces, and is able to realize the mobile reception of secondary fields in the boreholes and detections of low-resistance hazards. This method is known as high detection accuracy, due to the fact that the receiving points are close to the anomalies. However, the interpretation method for this device has not yet been perfected. The present study's goal was to realize the interpretations of boreholes TEM based on inverse transform algorithms of the TEM wave-fields and full waveform inversions. It was found that under the conditions of transient electromagnetic virtual wave-fields, the characteristics of the virtual wave-field time-distance curves of the two-dimensional device could be examined, and a corresponding dynamic correction algorithm was successfully obtained. The wave-field velocities were analyzed using an equivalent conductive plane method. Additionally, the pseudo-seismic inversions of the tunnel-borehole TEM data were realized using full waveform inversion technology. Then, the inversion results of the three-dimensional numerical simulations, flume physical simulations, and downhole field simulations were calculated. It was observed that good imaging results had been obtained for small-scale borehole radial anomalies. Finally, the proposed method was applied to the engineering practices in an underground coal mine in Shanxi Province. The practicability and effectiveness of the proposed method in the fine detection of the properties, forms, and scale of water-logged goaf roadways were successfully tested in the field. The research results indicated that the roadway-borehole transient electromagnetic detection method was complementary to the underground geophysical exploration and drilling, and could be effectively applied in the detection of water-logged goaf roadways.
井眼瞬变电磁虚波场全波形反演及其潜在应用
钻孔瞬变电磁法采用固定源环在开挖面发射,能够实现钻孔二次场的移动接收和低阻危害的探测。由于接收点离异常点较近,该方法具有较高的检测精度。然而,该装置的解释方法尚未完善。本研究的目标是基于瞬变电磁波场反变换算法和全波形反演实现钻孔瞬变电磁法的解释。研究发现,在瞬变电磁虚波场条件下,可以检测二维器件虚波场时距曲线的特性,并成功得到相应的动态校正算法。采用等效导电平面法对波场速度进行了分析。利用全波形反演技术实现了隧道-钻孔瞬变电磁法的拟地震反演。然后对三维数值模拟、水槽物理模拟和井下现场模拟的反演结果进行了计算。结果表明,该方法对小尺度井眼径向异常成像效果良好。最后,将该方法应用于山西某地下煤矿的工程实践。该方法在水淹采空区巷道性质、形态和规模精细检测中的实用性和有效性已在现场得到成功验证。研究结果表明,巷道-井瞬变电磁探测方法是对地下物探钻探的补充,可有效应用于采空区巷道的水淹探测。
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来源期刊
Journal of Environmental and Engineering Geophysics
Journal of Environmental and Engineering Geophysics 地学-地球化学与地球物理
CiteScore
2.70
自引率
0.00%
发文量
13
审稿时长
6 months
期刊介绍: The JEEG (ISSN 1083-1363) is the peer-reviewed journal of the Environmental and Engineering Geophysical Society (EEGS). JEEG welcomes manuscripts on new developments in near-surface geophysics applied to environmental, engineering, and mining issues, as well as novel near-surface geophysics case histories and descriptions of new hardware aimed at the near-surface geophysics community.
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