瞬变电磁法感应电压场与<i>B</i>场探测效果的数值计算对比分析

doi:10.11720/wtyht.2021.1087

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Abstract

In this study, the authors compared the loop source transient electromagnetic sounding effect between the induced voltage data and B_z data obtained by one-dimensional and three-dimensional forward modelling. The longest effective delay time of the two types of data under the current data acquisition accuracy of mainstream hardware was analyzed through a comparison of multiple models; the longitudinal and horizontal resolutions of the two types of data were analyzed through a comparison of apparent conductivity and one-dimensional inversion. The results show that, under the data acquisition accuracy presumed in this study, only when an abnormal body with a conductivity ≥ 0.036 S/m exists in the model can the effective delay time of the B_z data be longer than the induced voltage data. Compared with the induced voltage data, the B_z data can sense the underground anomaly in advance, but are worse in longitudinal and horizontal resolutions. The recovery of resistivity by B_z data is also worse than that by the induced voltage data. In the actual field measurement, it is not recommended to record only the B_z field. If conditions are allowed, the induced voltage and the B_z field could be collected simultaneously to obtain an optimized solution.

Key words： transient electromagnetic method B field induced voltage apparent conductivity one-dimensional inversion resolution

Received: 26 February 2020 Published: 01 March 2021

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	Zhan-Hui LI
	Miao-Xin YANG
	Xue-Feng CAO

Cite this article:

Zhan-Hui LI,Miao-Xin YANG,Xue-Feng CAO. A numerical study of transient electromagnetic sounding effect using the induced voltage and the B field data[J]. Geophysical and Geochemical Exploration, 2021, 45(1): 114-126.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1087 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I1/114

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