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Title: Method for imaging with low frequency electromagnetic fields

Abstract

A method 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 traveltimes 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.

Inventors:
 [1];  [2]
  1. (Lafayette, CA)
  2. (Berkeley, CA)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
869650
Patent Number(s):
US 5373443
Assignee:
Regents, University of California (Oakland, CA) LBNL
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; imaging; frequency; electromagnetic; fields; interpreting; data; ray; tomography; determine; earth; conductivity; accuracy; resolution; steps; placing; transmitters; various; positions; plurality; transmitter; holes; receivers; receiver; generate; signals; diffuse; medium; measured; diffusion; field; transformed; wavefield; traveltimes; corresponding; obtained; charting; regularization; parameter; alpha; transform; desired; property; derived; velocity; constructed; electromagnetic signals; electromagnetic fields; electromagnetic field; magnetic field; magnetic fields; electromagnetic signal; various positions; imaging method; frequency electromagnetic; transmitters generate; field data; /702/324/

Citation Formats

Lee, Ki H., and Xie, Gan Q. Method for imaging with low frequency electromagnetic fields. United States: N. p., 1994. Web.
Lee, Ki H., & Xie, Gan Q. Method for imaging with low frequency electromagnetic fields. United States.
Lee, Ki H., and Xie, Gan Q. Sat . "Method for imaging with low frequency electromagnetic fields". United States. https://www.osti.gov/servlets/purl/869650.
@article{osti_869650,
title = {Method for imaging with low frequency electromagnetic fields},
author = {Lee, Ki H. and Xie, Gan Q.},
abstractNote = {A method 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 traveltimes 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

Patent:

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