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2D inversion of frequency-domain electromagnetic data generated by line current source
TONG Xiaozhong * #,CAO Chuanghua,LIU Jianxin
School of Geosciences and Info-physics, Central South University, Changsha, 410083
*Correspondence author
#Submitted by
Subject:
Funding: Specialized Research Fund for the Doctoral Program of Higher Education(No.2011016212006), National Natural Science Foundation of China (No.41174403)
Opened online:25 November 2015
Accepted by: none
Citation: TONG Xiaozhong,CAO Chuanghua,LIU Jianxin.2D inversion of frequency-domain electromagnetic data generated by line current source[OL]. [25 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4662949
 
 
The inversion of electromagnetic data is an inherently non-unique and unstable problem due to the data noises and incomplete data coverage, which means different geo-electrical models could fit the observed data at the same level. A stable solution of an ill-posed inverse problem can be obtained by the regularization methods in which some desired structure are imposed to stabilize the inverse problem. We have developed an algorithm to invert frequency-domain electromagnetic data generated by a line current source for a 2D model of the earth. To stabilize the inversion, we adopt a smoothness-constraint approach for the model parameters and adjust the regularization parameter objectively using a adaptive regularization parameter technique. For calculating the sensitivities using any of the accurate methods will be very time-consuming, we applied the adjoint-equation approximate method. By means of the numerical examples using synthetic data, we have demonstrated that the inversion method can be effectively to reconstruct the subsurface resistivity structure.
Keywords:frequency-domain electromagnetic; line current source; 2D inversion; smoothness-constrained
 
 
 

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