Service interruption: Realtime availability, "I Want It," and My Account will be briefly offline on 8/18/22 from 1-1:30pm.

Export to Refworks Export to EndNote Email
Report an Issue

Efficient imaging of single-hole electromagnetic data [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
33 pages : digital, PDF file
Additional Creators:
Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It

Finding items...

Restrictions on Access:
Free-to-read Unrestricted online access
Summary:
The extended Born, or localized nonlinear (LN) approximation, of integral equation (IE) solution has been applied to inverting single-hole electromagnetic (EM) data using a cylindrically symmetric model. The extended Born approximation is less accurate than a full solution but much superior to the simple Born approximation. When applied to the cylindrically symmetric model with a vertical magnetic dipole source, however, the accuracy of the extended Born approximation is shown to be greatly improved because the electric field is scalar and continuous everywhere. One of the most important steps in the inversion is the selection of a proper regularization parameter for stability. The extended Born solution provides an efficient means for selecting an optimum regularization parameter, because the Green's functions, the most time consuming part in IE methods, are repeatedly re-usable at each iteration. In addition, the IE formulation readily contains a sensitivity matrix, which can be revised at each iteration at little expense. In this paper we show inversion results using synthetic and field data. The result from field data is compared with that of a 3-D inversion scheme.
Report Numbers:
E 1.99:lbnl--50010
lbnl--50010
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
04/01/2002.
"lbnl--50010"
"B& R EB4001000"
GRC 2002 Annual Meeting, Reno, NV (US), 09/22/2002--09/25/2002.
Lee, Ki Ha; Kim, Hee Joon; Wilt, Mike.
Funding Information:
AC03-76SF00098
G30327
View MARC record | catkey: 14379227