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A Fast Inversion Method for Interpreting Single-Hole Electromagnetic Data  

Kim, Hee-Joon (Department of Environmental Exploration Engineering, Pukyong National University)
Lee, Jung-Mo (Department of Geology, Kyungpook National University)
Publication Information
Geophysics and Geophysical Exploration / v.5, no.4, 2002 , pp. 316-322 More about this Journal
Abstract
A computationally efficient inversion scheme has been developed using the extended Born or localized nonlinear approximation to analyze electromagnetic fields obtained in a single-hole environment. The medium is assumed to be cylindrically symmetric about the borehole, and to maintain the symmetry vertical magnetic dipole source is used throughout. The efficiency and robustness of an inversion scheme is very much dependent on the proper use of Lagrange multiplier, which is often provided manually to achieve desired convergence. In this study, an automatic Lagrange multiplier selection scheme has been developed to enhance the utility of the inversion scheme in handling field data. The inversion scheme has been tested using synthetic data to show its stability and effectiveness.
Keywords
single-hole; localized nonlinear approximation; cylindrical symmetry; inversion;
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