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| 3-D quasi-analytic approximate inversion of borehole-to-surface electric data |
| Wang Zhi-gang1,2, He Zhan-xiang2, Wei Wen-bo1, Liu Xue-jun2, Tang Bi-yan2 |
| Department of Integrative Geophysical and Geochemical Exploration,BGP,Zhuozhou City,Hebei Province,072751,China |
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Abstract Considering complex geoelectric model,the study of 3-D inversion approaches of borehole-to-surface electric data is always a challenge. As a direct 3-D electromagnetic forward approximate modeling method,the traditional integral equation approach is characterized by a great deal of computational effort and lower precision.In order to avoid the shortcomings of integration approach,the quasi-analytic approximation (QA) emerges with characteristics of rapid computational speed and high precision.On the basis of quasi-analytic approximation and re-weighted regularized conjugate gradient method (RRCG),the paper deduced a set of algorithms practically used and used Visual Fortran 6.5 to develop the program of 3-D quasi-analytic approximation inversion of borehole-to-surface electric data. The inversion tests of synthetic data of theoretical models showed the 3-D inversion program of borehole-to-surface electric data based on QA and RRCG is characteristics of rapid computational speed and high precision of inversion.
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Received: 05 July 2006
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2007, Vol. 42 
