Parameter estimation for 3-D geoelectromagnetic inverse problems

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Publication Type Journal Article
School or College College of Mines & Earth Sciences
Department Geology & Geophysics
Creator Zhdanov, Michael S.
Other Author Portniaguine, Oleg
Title Parameter estimation for 3-D geoelectromagnetic inverse problems
Date 1999-01-01
Description Parameter estimation in geoelectromagnetics aims to obtain the most important parameters of a well-defined conductivity model of the Earth. These parameters are features of typical geological structures, such as depth and size of conductive or resistive targets, angle of dike inclination and its length, and conductivity of anomalous bodies. We develop this approach through regularized nonlinear optimization. We use finite differences of forward computations and Broyden's updating formula to compute sensitivities (Frechet or partial derivatives) for each parameter. To estimate the optimal step length, we apply line search, with a simple and fast parabolic correction. Our inversion also includes Tikhonov's regularization procedure. We use our method to study measurements of the magnetic fields from a conductive body excited by a loop source at the surface. Keeping the depth of the body constant, we estimate the horizontal coordinates of the body from three components of the magnetic field measured in a borehole. These measurements accurately determine the direction to the conductive target.
Type Text
Publisher Society of Exploration Geophysicists
Journal Title Spies
Volume 7
First Page 222
Last Page 32
Language eng
Bibliographic Citation Portniaguine, O., & Zhdanov, M. (1999). Parameter estimation for 3-D geoelectromagnetic inverse problems in Three-Dimensional Electromagnetics, ed. by M. Oristaglio and B. Spies, 7, 222-32.
Rights Management (c)Society of Exploration Geophysicists [Include link to article]
Format Medium application/pdf
Format Extent 1,000,447 bytes
Identifier ir-main,13890
ARK ark:/87278/s6b572wg
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2012-06-13
ID 702853
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