基于不等式和Gramian约束的MT和重力正则化联合反演

doi:10.11720/wtyht.2023.1474

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Abstract

Regularized joint inversion based on Gramian constraints is a hot research topic in the field of geophysical joint inversion. Given the difficulty in selecting weighted factors of the regularization and constraint items, it is necessary to introduce inequality constraints into the regularized joint inversion. To investigate the regularized joint inversion of magnetotelluric (MT) and gravity data based on Gramian constraints, this study compared the application effects of the penalty function method and the transform function method in the joint inversion and processed the measured data of a survey line in Xiangshan, Jiangxi Province. According to the results from model experiments, both methods can effectively constrain petrophysical parameters, and the penalty function method has higher flexibility but requires the artificial setting of the weighted factors. Moreover, the processing of the measured data shows that the joint inversion based on inequality and Gramian constraints is highly practical and can improve the precision of geophysical interpretation.

Key words： joint inversion Gramian constraint inequality constraint regularized Xiangshan, Jiangxi

Received: 21 September 2022 Published: 05 July 2023

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	Articles by authors
	Xiao CHEN
	Zhi-Wen ZENG
	Ju-Zhi DENG
	Zhi-Yong ZHANG
	Hui CHEN
	Hui YU
	Yan-Guo WANG

Cite this article:

Xiao CHEN,Zhi-Wen ZENG,Ju-Zhi DENG, et al. Regularized joint inversion of magnetotelluric and gravity data based on inequality and Gramian constraints[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 575-583.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1474 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/575

Joint inversed results of different projects for the model test 1
a—designed residual density model;b—designed resistivity model;c—residual density result of project 1;d—resistivity result of project 1; e—residual density result of project 2;f—resistivity result of project 2;g—residual density result of project 3 ;h—resistivity result of project 3;i—fitting curves of gravity anomalies

Joint inversed results of different projects for the model test 2
a—residual density result of project 1;b—resistivity result of project 1; c—residual density result of project 2;d—resistivity result of project 2;e—residual density result of project 3;f—resistivity result of project 3;g—fitting curves of gravity anomalies

Position map of a profile in the Xiangshan volcanic basin

Statistical results of petrophysical properties of Xiangshan volcanic basin

3D inversed resistivity result of a MT profile

Joint inversed results of different projects
a—joint inversed residual density result of project 1;b—joint inversed residual density result of project 2; c—gravity anomaly fitting curves of project 1;d—gravity anomaly fitting curves of project 2;e—coupling relationship for joint inversed results of project 1;f—coupling relationship for joint inversed results of project 2

Comparison diagram of 3D MT inversed result and joint inversed residual density result
a—3D MT inversed result;b—joint inversed residual density result

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