Two-dimensional time domain electromagnetic migration

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Title Two-dimensional time domain electromagnetic migration
Publication Type thesis
School or College College of Mines & Earth Sciences
Department Geology & Geophysics
Author Furukawa, Toshiko
Date 2008-08
Description The application of electromagnetic (EM) methods in petroleum and mining exploration requires development of appropriate imaging techniques which provide the means for fast but accurate evaluation of the observed data. Time domain electromagnetic (TDEM) methods are widely used in such exploration, but practical interpretation is mainly based on a simple one-dimensional (ID) inversion of the data at any given observation point. Due to the emergence of a new technique called the multi-transient electromagnetic (MTEM) method, which consists of multiple transmitters and receivers in its survey configuration, the development of multidimensional interpretation of MTEM data is required. In this study, a fast two-dimensional (2D) approach to MTEM data interpretation using the idea of TDEM migration is introduced. The computation of the migration field is based on downward extrapolation of the observed field in reverse time. An effective method of EM migration based on the operator of an integral transformation in the spatial-temporal domain is examined. The migration geoelectrical image is constructed using the convolution of the background and migration fields. Also, the technique is extended for interpretation of MTEM data observed both in land surveys with layered background media and in marine hydrocarbon exploration by introducing an adjoint land geoelectrical model for a given model and a corresponding adjoint field. The accuracy of this imaging technique is demonstrated successfully using synthetic MTEM data simulating mining exploration and hydrocarbon exploration in land and marine survey environments, respectively, and the results ensure that this imaging technique works extremely well.
Type Text
Publisher University of Utah
Subject Electric prospecting; Time-domain reflectometry
Dissertation Institution University of Utah
Dissertation Name MS
Language eng
Relation is Version of Digital reproduction of "Two-dimensional time domain electromagnetic migration using integral trasnformation" J. Willard Marriott Library Special Collections, TN7.5 2008 .F87
Rights Management © Toshiko Furukawa
Format application/pdf
Format Medium application/pdf
Format Extent 127,182 bytes
Identifier us-etd2,32652
Source Original: University of Utah J. Willard Marriott Library Special Collections
ARK ark:/87278/s66m3nb2
Setname ir_etd
ID 192656
Reference URL https://collections.lib.utah.edu/ark:/87278/s66m3nb2
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