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Title: Method for imaging with low frequency electromagnetic fields

Abstract

A method is described for imaging with low frequency electromagnetic fields, and for interpreting the electromagnetic data using ray tomography, in order to determine the earth conductivity with high accuracy and resolution. The imaging method includes the steps of placing one or more transmitters, at various positions in a plurality of transmitter holes, and placing a plurality of receivers in a plurality of receiver holes. The transmitters generate electromagnetic signals which diffuse through a medium, such as earth, toward the receivers. The measured diffusion field data H is then transformed into wavefield data U. The travel times corresponding to the wavefield data U, are then obtained, by charting the wavefield data U, using a different regularization parameter [alpha] for each transform. The desired property of the medium, such as conductivity, is then derived from the velocity, which in turn is constructed from the wavefield data U using ray tomography. 13 figures.

Inventors:
;
Issue Date:
OSTI Identifier:
6870298
Patent Number(s):
5373443 A
Application Number:
PPN: US 8-132408
Assignee:
University of California, Oakland, CA (United States) PTO; EDB-95-031892
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Patent File Date: 6 Oct 1993
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ELECTROMAGNETIC SURVEYS; DATA ANALYSIS; RESERVOIR ROCK; ELECTRIC CONDUCTIVITY; WAVE PROPAGATION; WELL LOGGING EQUIPMENT; ELECTRICAL PROPERTIES; ELECTRICAL SURVEYS; EQUIPMENT; GEOPHYSICAL SURVEYS; PHYSICAL PROPERTIES; SURVEYS 580000* -- Geosciences

Citation Formats

Lee, K.H., and Xie, G.Q. Method for imaging with low frequency electromagnetic fields. United States: N. p., 1994. Web.
Lee, K.H., & Xie, G.Q. Method for imaging with low frequency electromagnetic fields. United States.
Lee, K.H., and Xie, G.Q. Tue . "Method for imaging with low frequency electromagnetic fields". United States.
@article{osti_6870298,
title = {Method for imaging with low frequency electromagnetic fields},
author = {Lee, K.H. and Xie, G.Q.},
abstractNote = {A method is described for imaging with low frequency electromagnetic fields, and for interpreting the electromagnetic data using ray tomography, in order to determine the earth conductivity with high accuracy and resolution. The imaging method includes the steps of placing one or more transmitters, at various positions in a plurality of transmitter holes, and placing a plurality of receivers in a plurality of receiver holes. The transmitters generate electromagnetic signals which diffuse through a medium, such as earth, toward the receivers. The measured diffusion field data H is then transformed into wavefield data U. The travel times corresponding to the wavefield data U, are then obtained, by charting the wavefield data U, using a different regularization parameter [alpha] for each transform. The desired property of the medium, such as conductivity, is then derived from the velocity, which in turn is constructed from the wavefield data U using ray tomography. 13 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {12}
}