瞬变电磁的逆时偏移成像方法

doi:10.11720/wtyht.2020.1517

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Abstract

In this paper, inverse time migration imaging of center loop transient electromagnetic sounding is studied. In view of the fact that the propagation velocity of electromagnetic wave in the earth is much lower than that of the speed of light in the vacuum, an inverse time migration imaging algorithm is designed which is suitable for transient electromagnetic sounding in the center loop observation configuration. The core idea of the algorithm is to obtain the total wave field value of the imaging point according to the superposition of the wave field value of different observation points at the same time of the imaging point. Based on this algorithm, inverse time migration imaging was performed on a measured center loop transient electromagnetic sounding data. It is shown that the results of inverse time migration imaging are in good agreement with the actual situation and can obtain better processing effect. Therefore, inverse time migration imaging is an effective data processing method for transient electromagnetic sounding.

Key words： electrical prospecting transient electromagnetic sounding inverse time migration imaging electromagnetic velocity

Received: 02 November 2019 Published: 29 December 2020

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	Zi-Jing CHEN
	Qing-Li CHEN

Cite this article:

Zi-Jing CHEN,Qing-Li CHEN. Transient electromagnetic inverse time migration imaging method[J]. Geophysical and Geochemical Exploration, 2020, 44(6): 1415-1419.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1517 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I6/1415

The electromagnetic wave velocity in medium

The measured induced electromotive force curve of a site

The inverse time migration imaging section of the center loop transient electromagnetic method

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