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Detection method of coal-rock interface and low-resistivity anomalous body based on azimuth electromagnetic wave

  • Electrical and electromagnetic methods
  • Published:
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Abstract

A geological model related to coal-rock electromagnetic parameters is constructed in this work using coal-rock media and coal-rock interfaces as the research objects for electromagnetic wave propagation response. An in-depth analysis was conducted to examine the response characteristics of the electromagnetic wave detection technology for coal and rock geological orientations while drilling in coal mines. We also studied the detection and identification methods and applicability of coal and rock interfaces. Next, we simulated the response characteristics of the instrument in the coal seam and established a calculation method for the orientation of the interface between the roof and floor of the coal seam and the distance between the instrument and the coal seam’s interface. The quasi-Newton method was used to perform inversion calculations on the theoretical model of the response of the borehole-while-drilling azimuth electromagnetic wave resistivity tool, and the simulation data were inverted in real time, thereby reducing the number of calculations of the Jacobian matrix, improving the inversion speed, and decreasing the level of dependence on the initial value. Furthermore, we obtained the signal response law of electromagnetic wave detection in low-resistivity aquifers and abnormal geological bodies (e.g., collapse columns and gangue interlayers) based on forward and inversion numerical simulation. Finally, by investigating the directional electromotive force simulation imaging method of the orthogonal coil, we verified the feasibility of the application of azimuth electromagnetic wave resistivity in high-resistivity coal seams. In this way, we can provide the basis for the detection of coal seam interface, geological anomaly body, and geological guidance application.

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Acknowledgments

This research is supported by the National Natural Science Foundation of China (42102350); China Postdoctoral Science Foundation (No. 2022M711442); Key R&D Plan of Shaanxi Province (Grant No. 2023-YBGY-111); General Project of middling coal Technology and Industry Group (Grant No. 2022-2-TD-MS005); Key Project of middling coal Technology and Industry Group (Grant No. 2022-2-TD-ZD006); National Key R&D Plan Tasks (Grant No. 2022YFC3005905-3).

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Authors and Affiliations

  1. Xian Research Institute of China Coal Research Institute, Xi’an, Shaanxi, 710077, China

    Gang Chen, Quan-xin Li, Long Chen & Yi Zhang

  2. School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, Gansu, China

    Gang Chen & Zhi-yi Liu

Authors
  1. Gang Chen
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  2. Quan-xin Li
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  3. Zhi-yi Liu
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  4. Long Chen
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  5. Yi Zhang
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Corresponding author

Correspondence to Quan-xin Li.

Additional information

Chen Gang, associate researcher, obtained his Master’s Degree in Earth Exploration Science and Information Technology from Jilin University in 2013. In 2020, he received his Ph.D. in Geological Resources And Geological Engineering from China University of Petroleum. At present, he is at the Xi’an Research Institute of China Coal Technology and Industry Corporation, where he is engaged in geological guidance research on LWD.

Li Quan-Xin, researcher, Ph.D., master’s supervisor. He is a third-level Chief Scientist of Middling Coal Science and Engineering Group. At present, he is engaged in the research and development and promotion of coal mine underground drilling technology and equipment at the Science and Technology Innovation Research Institute.

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Chen, G., Li, Qx., Liu, Zy. et al. Detection method of coal-rock interface and low-resistivity anomalous body based on azimuth electromagnetic wave. Appl. Geophys. 20, 157–166 (2023). https://doi.org/10.1007/s11770-023-1031-1

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  • DOI: https://doi.org/10.1007/s11770-023-1031-1

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