海洋可控源电磁法与地震全波形二维联合反演研究

doi:10.11720/wtyht.2024.2583

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Abstract

To reduce the limitations and the multiplicity of solutions of a single geophysical inversion method, this study investigated the two-dimensional joint inversion based on the marine controlled-source electromagnetic (MCSEM) method and seismic full-waveform inversion. The MCSEM method employs the data-space Occam’s algorithm, while the seismic full-waveform inversion utilizes the gradient algorithm. By incorporating a cross-gradient function for the mutual coupling of the two types of physical property parameters, this study developed a two-dimensional joint inversion method, whose accuracy was verified using three different models. As indicated by the results, compared to a single inversion method, the MCSEM-based joint inversion yielded significantly improved inversion results, predominantly in terms of the morphology characterization of anomalous bodies, as well as the reconstruction of their structure and textures and their physical property values. Therefore, the full-waveform inversion can enhance the reliability of the MCSEM inversion results.

Key words： marine controlled-source electromagnetic (MCSEM) seismic full-waveform cross-gradient joint inversion

Received: 22 November 2022 Published: 26 February 2024

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	Fan-Xiang KONG
	Han-Dong TAN
	Jian-Xun LIU

Cite this article:

Fan-Xiang KONG,Han-Dong TAN,Jian-Xun LIU. Two-dimensional joint inversion based on the marine controlled-source electromagnetic method and seismic full-waveform[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 67-76.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.2583 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/67

Inversion grid discrete schemes

The cross-gradient calculation results of two models

The sketch of the Cross-Gradient mesh

Joint-inversion flow

Synthetic model of the single tabular body

The profile of the inversion as well as the iterative curve of the RMS misfit of the single tabular body model

Synthetic model of the complex tabular body

The profile of the inversion as well as the iterative curve of the RMS misfit of the complex tabular body model

Synthetic model of the groove body

The profile of the inversion as well as the iterative curve of the RMS misfit of the groove body model

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