[an error occurred while processing this directive] Global Geology 2020, 23(2) 123-134 DOI:   10.3969/j.issn.1673-9736.2020.02.06  ISSN: 1673-9736 CN: 22-1371/P
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本文关键词相关文章
alternating joint inversion
structural constraint
MT inversion
FWI
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PubMed
Joint inversion of magnetotelluric and fullwaveform seismicdata based on alternating cross-gradient structural constraints
QI Jiahui, FENG Xuan, Enhedelihai Nilot, LI Xiaodan
College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China
摘要： Magnetotelluric (MT) inversion and seismic inversion are important methods for the interpretation of subsurface exploration data, but separate inversion of MT and seismic produces ambiguous and non-unique results due to various factors. In order to achieve accurate results, the authors propose a joint inversion method of two-dimensional MT and seismic data in the frequency domain. The finite element method is used for numerical simulation of electromagnetic data in the forward modelling, and the Gauss-Newton method is used for the inversion. The 9-point-finite-difference method is used to solve the seismic wave field in the acoustic wave equation, and the inverse problem of seismic data is solved by full waveform inversion with a conjugate gradient, a simple and fast method. Cross gradient functions are used to provide constraint structure between resistivity and velocity parameters to carry out the joint inversion. The joint inversion algorithm is tested by double-rectangular model synthesis data, and the accuracy of the algorithm is verified. The results show that the joint inversion results are better than those from separate inversion. The algorithm is applied to a geophysical model of a metalliferous deposit in Jinchuan and is compared with the separate inversion results. It shows that the results obtained with joint inversion are much closer to the real model.
关键词： alternating joint inversion   structural constraint   MT inversion   FWI  
Joint inversion of magnetotelluric and fullwaveform seismicdata based on alternating cross-gradient structural constraints
QI Jiahui, FENG Xuan, Enhedelihai Nilot, LI Xiaodan
College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China
Abstract: Magnetotelluric (MT) inversion and seismic inversion are important methods for the interpretation of subsurface exploration data, but separate inversion of MT and seismic produces ambiguous and non-unique results due to various factors. In order to achieve accurate results, the authors propose a joint inversion method of two-dimensional MT and seismic data in the frequency domain. The finite element method is used for numerical simulation of electromagnetic data in the forward modelling, and the Gauss-Newton method is used for the inversion. The 9-point-finite-difference method is used to solve the seismic wave field in the acoustic wave equation, and the inverse problem of seismic data is solved by full waveform inversion with a conjugate gradient, a simple and fast method. Cross gradient functions are used to provide constraint structure between resistivity and velocity parameters to carry out the joint inversion. The joint inversion algorithm is tested by double-rectangular model synthesis data, and the accuracy of the algorithm is verified. The results show that the joint inversion results are better than those from separate inversion. The algorithm is applied to a geophysical model of a metalliferous deposit in Jinchuan and is compared with the separate inversion results. It shows that the results obtained with joint inversion are much closer to the real model.
Keywords: alternating joint inversion   structural constraint   MT inversion   FWI  
收稿日期 2019-07-07 修回日期 2019-08-24 网络版发布日期  
DOI: 10.3969/j.issn.1673-9736.2020.02.06
基金项目:

Supported by the National Key Research and Development Project (No.2016YFC0600505).

通讯作者: FENG Xuan
作者简介:
作者Email: fengxuan@jlu.edu.cn
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