音频大地电磁接地电阻校正技术研究

doi:10.11720/wtyht.2025.1173

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摘要

接地电阻是影响音频大地电磁测量精度的重要因素之一,因此,研究降低接地电阻的干扰对于提高音频大地电磁数据的可靠性和解释精度具有重要意义。本文深入研究了接地电阻对实测电场、视电阻率和阻抗相位的影响,并提出了相应数值校正方法,将接地电阻的影响降低至可忽略的程度。理论计算结果表明,当接地电阻过高时,高频段的视电阻率最大减小至原来的1/4,阻抗相位最大偏移20°。实测数据校正结果表明,该方法能有效降低接地电阻造成的干扰,提高音频大地电磁法对浅部信息探测的精度,对于改善音频大地电磁法在工程勘查等领域的应用效果具有重要意义。

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	李栋
	张明财
	吴远洋

关键词 ：音频大地电磁法, 接地电阻, 视电阻率, 阻抗相位, 校正

Abstract：

Ground resistance is a significant factor affecting the accuracy of audio-frequency magnetotelluric (AMT) measurements. Hence, reducing the interference from ground resistance is critical for enhancing the reliability and interpretation accuracy of AMT data. By delving into the impacts of ground resistance on the measured electric field, apparent resistivity, and impedance phase, this study proposed a numerical correction method for reducing the impacts of ground resistance to a negligible level. As indicated by the theoretical calculation results, too high ground resistance can reduce the apparent resistivity in high-frequency bands to a quarter of the original value and shift the impedance phase by a maximum of 20°. The correction results of measured data demonstrate that the proposed method can enhance the accuracy of the AMT method in detecting shallow information by effectively reducing the interference from ground resistance. Therefore, this study holds critical significance for improving the application of the AMT method in engineering exploration.

Key words： audio-frequency magnetotelluric (AMT) method ground resistance apparent resistivity impedance phase correction

收稿日期: 2024-04-19 修回日期: 2024-06-21 出版日期: 2025-06-20

ZTFLH:

P631

基金资助:中国电建核心科技攻关项目(DJ-HXGG-2023-08);中国电建集团西北勘测设计研究院有限公司科技项目(XBY-DKY-2023-26)

通讯作者: 张明财(1986-),男,博士,高级工程师,2021年毕业于中南大学,主要从事水利水电工程物探探测与检测工作。Email:csuzmc@163.com

作者简介: 李栋(1993-),男,工程师,2019年毕业于长安大学,主要从事水利水电工程地球物理勘查工作。Email:465002395@qq.com

引用本文:

李栋, 张明财, 吴远洋. 音频大地电磁接地电阻校正技术研究[J]. 物探与化探, 2025, 49(3): 614-619.
LI Dong, ZHANG Ming-Cai, WU Yuan-Yang. Exploring a correction technology for ground resistance in audio-frequency magnetotelluric measurements. Geophysical and Geochemical Exploration, 2025, 49(3): 614-619.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2025.1173 或 https://www.wutanyuhuatan.com/CN/Y2025/V49/I3/614

Fig.1 接收回路等效电路

Fig.2 电场幅值与接地电阻关系

Fig.3 视电阻率与接地电阻关系

Fig.4 阻抗相位与接地电阻关系

Table 1 L1线各测点接地电阻

Fig.5 90 m点视电阻率校正前后曲线

Fig.6 580 m点视电阻率校正前后曲线

Fig.7 L1线校正前阻抗相位极坐标

Fig.8 L1线校正后阻抗相位极坐标

Fig.9 L1线校正前反演电阻率剖面

Fig.10 L1线校正后反演电阻率剖面

Table 2 ZK204编录资料

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