Actions for Interpretation of time domain electromagnetic soundings near geological contacts [electronic resource].

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Interpretation of time domain electromagnetic soundings near geological contacts [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (187 pages) : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy, United States. Department of Energy. Office of Environmental Management, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Lateral changes in geology pose a serious problem in data interpretation for any surface geophysical method. Although many geophysical techniques are designed to probe vertically, the source signal invariably spreads laterally, so any lateral variations in geology will affect the measurements and interpretation. This problem is particularly acute for controlled source electromagnetic soundings because only a few techniques are available to interpret the data if lateral effects are present. In this thesis we examine the effects of geological contacts for the time domain electromagnetic sounding method (TDEM). Using two simple two-dimensional models, the truncated thin-sheet and the quarter-space, we examine the system response for several commonly used TDEM sounding configurations. For each system we determine the sensitivity to the contact, establish how to the contact anomaly may be distinguished from other anomalies and, when feasible, develop methods for interpreting the contact geometry and for stripping the contact anomaly from the observed data. Since no numerical models were available when this work was started, data were collected using scale models with a system designed at the University of California at Berkeley. The models were assembled within a table-top modeling tank from sheets or blocks of metal using air or mercury as a host medium. Data were collected with a computer-controlled acquisition system.
Report Numbers
E 1.99:lbl-31674
lbl-31674
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/01/1991.
"lbl-31674"
"DE92010467"
Wilt, M.J.
Funding Information
AC03-76SF00098
View MARC record | catkey: 14380633