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Title: Electrical resistance tomography using steel cased boreholes as electrodes

Abstract

An electrical resistance tomography method using steel cased boreholes as electrodes. The method enables mapping the electrical resistivity distribution in the subsurface from measurements of electrical potential caused by electrical currents injected into an array of electrodes in the subsurface. By use of current injection and potential measurement electrodes to generate data about the subsurface resistivity distribution, which data is then used in an inverse calculation, a model of the electrical resistivity distribution can be obtained. The inverse model may be constrained by independent data to better define an inverse solution. The method utilizes pairs of electrically conductive (steel) borehole casings as current injection electrodes and as potential measurement electrodes. The greater the number of steel cased boreholes in an array, the greater the amount of data is obtained. The steel cased boreholes may be utilized for either current injection or potential measurement electrodes. The subsurface model produced by this method can be 2 or 3 dimensional in resistivity depending on the detail desired in the calculated resistivity distribution and the amount of data to constain the models.

Inventors:
 [1];  [2]
  1. Livermore, CA
  2. Pleasanton, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
872347
Patent Number(s):
5914603
Assignee:
Regents of University of California (Oakland, CA)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electrical; resistance; tomography; steel; cased; boreholes; electrodes; method; enables; mapping; resistivity; distribution; subsurface; measurements; potential; caused; currents; injected; array; current; injection; measurement; generate; data; inverse; calculation; model; obtained; constrained; independent; define; solution; utilizes; pairs; electrically; conductive; borehole; casings; amount; utilized; produced; dimensional; depending; detail; desired; calculated; constain; models; steel cased; current injection; method enables; method utilizes; measurement electrodes; electrical potential; electrically conductive; electrical resistance; electrical current; electrical resistivity; cased boreholes; borehole casing; resistivity distribution; resistance tomography; cased borehole; electrical currents; potential measurement; cased bore; rate data; borehole casings; /324/

Citation Formats

Daily, William D, and Ramirez, Abelardo L. Electrical resistance tomography using steel cased boreholes as electrodes. United States: N. p., 1999. Web.
Daily, William D, & Ramirez, Abelardo L. Electrical resistance tomography using steel cased boreholes as electrodes. United States.
Daily, William D, and Ramirez, Abelardo L. Fri . "Electrical resistance tomography using steel cased boreholes as electrodes". United States. https://www.osti.gov/servlets/purl/872347.
@article{osti_872347,
title = {Electrical resistance tomography using steel cased boreholes as electrodes},
author = {Daily, William D and Ramirez, Abelardo L},
abstractNote = {An electrical resistance tomography method using steel cased boreholes as electrodes. The method enables mapping the electrical resistivity distribution in the subsurface from measurements of electrical potential caused by electrical currents injected into an array of electrodes in the subsurface. By use of current injection and potential measurement electrodes to generate data about the subsurface resistivity distribution, which data is then used in an inverse calculation, a model of the electrical resistivity distribution can be obtained. The inverse model may be constrained by independent data to better define an inverse solution. The method utilizes pairs of electrically conductive (steel) borehole casings as current injection electrodes and as potential measurement electrodes. The greater the number of steel cased boreholes in an array, the greater the amount of data is obtained. The steel cased boreholes may be utilized for either current injection or potential measurement electrodes. The subsurface model produced by this method can be 2 or 3 dimensional in resistivity depending on the detail desired in the calculated resistivity distribution and the amount of data to constain the models.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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Works referenced in this record:

The effects of noise on Occam’s inversion of resistivity tomography data
journal, March 1996