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:
-
- Lafayette, CA
- Berkeley, CA
- Issue Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- OSTI Identifier:
- 869650
- Patent Number(s):
- 5373443
- Assignee:
- Regents, University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS
- 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 = {Sat Jan 01 00:00:00 EST 1994},
month = {Sat Jan 01 00:00:00 EST 1994}
}
Works referenced in this record:
A new approach to imaging with low‐frequency electromagnetic fields
journal, June 1993
- Lee, Ki Ha; Xie, Ganquan
- GEOPHYSICS, Vol. 58, Issue 6
A new approach to modeling the electromagnetic response of conductive media
journal, September 1989
- Lee, K. H.; Liu, G.; Morrison, H. F.
- GEOPHYSICS, Vol. 54, Issue 9