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Magnetic Viscosity Effect on Grounded-Wire TEM Responses and Its Physical Mechanism

机译：磁性粘度对接地线响应及其物理机制的影响

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摘要

Magnetic viscosity (MV) effect is a disturbance to the transient electromagnetic method (TEM). This effect will cause slow decay at the intermediate-late time of the TEM responses, leading to erroneous interpretation. Although there are extensive researches on the MV distortion to TEM data, they are focused on conventional loop source configuration, while little has been studied for grounded-wire source configuration that has become the essential role for relatively deep-buried targets. Hence, we present the study of MV effect on the grounded-wire source TEM data. We first derived the formulas for calculating the secondary field due to MV effect, based on the Chikazumi model. The dependence of the MV effect on model parameters, such as resistivity, susceptibility, offset and geometry of the superparamagnetic layer, is then examined to illustrate the intrinsic physical mechanism of MV effect. We find that the MV effect on the grounded-wire source TEM data can be suppressed by adjusting the parameters of the survey design. Thereafter, we propose the method to quantify the MV effect when estimates of resistivity and susceptibility are available. Finally, the method for choosing the optimal offset to suppress the MV effect is proposed, which can be used as a guide for the installation of fieldwork of grounded-wire TEM survey.
机译：磁粘度（MV）效应是对瞬态电磁法（TEM）的干扰。这种效果将在TEM反应的中期时间造成缓慢的衰减，从而导致错误的解释。尽管对TEM数据的MV失真进行了广泛的研究，但它们的专注于传统的循环源配置，虽然已经对接地线源配置进行了很少的研究，其已成为相对深埋目标的基本作用。因此，我们介绍了对接地线源TEM数据的MV影响的研究。根据Chikazumi模型，我们首先通过MV效果来派生用于计算次要领域的公式。然后检查MV对模型参数的依赖性，例如超顺磁层的电阻率，敏感度，偏移和几何形状，以说明MV效应的内在物理机制。我们发现，通过调整测量设计的参数，可以抑制对接地线源TEM数据的MV影响。此后，当可获得电阻率和易感性的估计时，我们提出了量化MV效应的方法。最后，提出了用于选择最佳偏移以抑制MV效应的方法，可以用作安装接地线TEM调查的实地性的指南。

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  • 来源
    《Quality Control, Transactions》 |2020年第2020期|6140-6152|共13页
  • 作者

    Zhang Linbo; Li Hai; Xue Guoqiang; Chen Wen; He Yiming;

  • 作者单位

    Chinese Acad Sci Inst Geol & Geophys Key Lab Mineral Resources Beijing 100029 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Innovat Acad Earth Sci Beijing 100029 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys Key Lab Mineral Resources Beijing 100029 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys Key Lab Mineral Resources Beijing 100029 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Innovat Acad Earth Sci Beijing 100029 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys Key Lab Mineral Resources Beijing 100029 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Innovat Acad Earth Sci Beijing 100029 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys Key Lab Mineral Resources Beijing 100029 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Innovat Acad Earth Sci Beijing 100029 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Grounded-wire source TEM; magnetic viscosity effect; Chikazumi model; physical mechanism; superparamagnetic;

    机译：接地丝源TEM;磁粘度效应;Chikazumi模型;物理机制;超顺磁性;

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