Enhanced detectability using differential fields for marine controlled-source EM data in shallow waters

Gang Li; Wen Lei; Chaofan Li; Linjiang Qin

doi:10.1080/08123985.2023.2176747

ISSN: 0812-3985
E-ISSN: 1834-7533

Enhanced detectability using differential fields for marine controlled-source EM data in shallow waters
Authors Gang Li^{a ,b}, Wen Lei^a, Chaofan Li^a and Linjiang Qin^{c ,d}
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^a Department of Marine Sciences, Ocean College, Zhejiang University, , Zhoushan, , People’s Republic of China ^b Hainan Institute, Zhejiang University, , Sanya, , People’s Republic of China ^c Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, , Hangzhou, , People’s Republic of China ^d Second Institute of Oceanography, Ministry of Natural Resources, , Hangzhou, , People’s Republic of China
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 54, Issue 5, Sep 2023, p. 457 - 462
DOI: https://doi.org/10.1080/08123985.2023.2176747
- Received: 14 Jan 2022
- Accepted: 01 Feb 2023
- Published online: 03 Sep 2023

Abstract

ABSTRACT

In shallow waters, the interpretation of the frequency-domain marine controlled-source electromagnetic (CSEM) data is challenging due to the airwave. The airwave dominates and will lead to misinterpretation of the data set. A differential-field approach is presented to attenuate the airwave for the shallow-water marine CSEM data. The difference of the fields between two consecutive receivers or source points is calculated and weighted by the geometric spreading related factor. By using differential fields, the detectability given by the field ratio between the models with and without the target is enhanced, which indicates that the impact of airwaves is suppressed.

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/content/journals/10.1080/08123985.2023.2176747

Enhanced detectability using differential fields for marine controlled-source EM data in shallow waters

Exploration Geophysics 54, 457 (2023); https://doi.org/10.1080/08123985.2023.2176747

/content/journals/10.1080/08123985.2023.2176747

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Article Type: Research Article

Keyword(s): airwave; differential fields; Electromagnetic theory

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Enhanced detectability using differential fields for marine controlled-source EM data in shallow waters

Abstract

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