海洋辅助源宽频大地电磁方法

doi:10.13810/j.cnki.issn.1000-7210.2024.01.017

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Abstract Because of the influence of air waves， the shallow water area is almost a blind spot for the commonly used marine controlled source electromagnetic detection method. However， due to the absorption and attenuation of seawater， the high-frequency components of magnetotelluric sounding signals are seriously attenuated in water areas. Therefore， both methods have shortcomings in terms of depth detection. To solve this problem， this paper proposes the marine auxiliary source broadband magnetotelluric method， which applies the controlled source audio magnetotelluric method to marine resource exploration and carries out electromagnetic data acquisition of mixed sources. In other words， the exciting source is deployed on the water surface in the far area， and the acquisition stations are deployed on the seabed to receive electromagnetic signals， so as to obtain the marine controlled source audio magnetotelluric data .By merging the two sets of data， broadband magnetotelluric detection in the whole sea area is realized. In addition， a three-layer geoelectric model including air， seawater， and seabed is derived， and each component of the electromagnetic field for the surface-excitation and seafloor-receiving acquisition is calculated to simulate and analyze the adaptability and feasibility of the marine controlled source audio magnetotelluric components. By simulating the broadband apparent magnetotelluric resistivity curves of different models and analyzing their characteristics， a more suitable electromagnetic detection method is proposed for marine resource exploration and deep geoscience research.

Key words： marine auxiliary source broadband magnetotelluric adaptability full depth detection 3D modelling

Received: 09 June 2023

PACS:

P631

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	Articles by authors
	YUAN Hui
	HE Zhanxiang
	ZHAO Yunsheng
	ZHANG Shuoning
	YU Guo
	WU Mengying

Cite this article:

YUAN Hui,HE Zhanxiang,ZHAO Yunsheng等. Marine auxiliary source broadband magnetotelluric method[J]. OGP, 2024, 59(1): 160-168.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2024.01.017 OR http://www.ogp-cn.com/EN/Y2024/V59/I1/160

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