大深度激电法中电磁耦合效应分析与去除方法

doi:10.11720/wtyht.2025.1499

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Abstract

With the gradual depletion of shallow mineral resources, deep mineral exploration has emerged as an essential development trend in the mining industry. Increasing the distance between receiver electrodes of induced polarization (IP) devices is the most direct and effective approach to enhance the exploration depth. However, a long distance can cause strong electromagnetic (EM) coupling effects, severely interfering with IP signals. Addressing this challenge, this study calculated the EM coupling effects of various measuring devices in homogeneous half-space and layered media using analytical methods. Furthermore, this study comparatively analyzed the impacts of various factors, including measuring device type, wiring layout, distance between receiver electrodes, earth resistivity, and frequency, on the EM coupling intensity. Based on the phase differences between IP and EM coupling effects in the frequency domain, this study derived the calculation equation of the relative phase spectrum, followed by a theoretical analysis of the decoupling effects in application scenarios. The results indicate that increasing distance between receiver electrodes, decreasing earth resistivity, and raising working frequency all significantly intensified the EM coupling interference. Under consistent conditions and detection depths, the Schlumberger array suffered from higher EM coupling interference compared to the pole-dipole array. Compared to the traditional IP phase spectrum, the relative phase spectrum enhanced the maximal working frequency of the pole-dipole and Schlumberger arrays by four and 10.6 times, respectively, suggesting the decoupling capability of the relative phase method in large-depth IP exploration. Overall, this study provides significant guidance for the field implementation of large-depth IP exploration.

Key words： large-depth induced polarization (IP) method decoupling relative phase method electrode

Received: 26 December 2024 Published: 30 December 2025

ZTFLH:

P631

Corresponding Authors: CHEN Ru-Jun E-mail: 187277894@qq.com;chrujun12358@gmail.com

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	Zhen-Xing JI
	Hao-Jie QIN
	Ru-Jun CHEN
	Quan-Gong WANG

Cite this article:

Zhen-Xing JI,Hao-Jie QIN,Ru-Jun CHEN, et al. Analysis and removal of electromagnetic coupling effects in the large-depth induced polarization method[J]. Geophysical and Geochemical Exploration, 2025, 49(6): 1393-1401.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1499 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I6/1393

Schematic of the electrode arrays in common use

The phase of IP and EM coupling in different electrode arrays

The variation of the EM coupling with the spacing of the current-electrodes in the pole-dipole array

Impact of side distance on EM coupling in intermediate gradient array

The frequency response characteristics of EM coupling in Schlumberger array

The impact of frequency ratio on decoupling effect in the relative phase method

Comparison of IP phase and relative phase in different electrode arrays

Comparison of the maximum working frequency of IP phase and relative phase

The decoupling effect of the relative phase method (a case study of the Huhe-shala mining area)

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