Electrical resistance tomography using steel cased boreholes as

Details Electrical resistance tomography using steel cased boreholes as Electrical resistance tomography using steel cased boreholes as

1997-02-20

1999-06-22

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324368, G01V 302, G01V 304, G01V 306, G01V 318

Patent

active

059146036

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.

REFERENCES:
patent: 2408593 (1946-05-01), Nuefeld
patent: 4796186 (1989-01-01), Kaufman
patent: 4820989 (1989-04-01), Vail, III
patent: 4882542 (1989-11-01), Vail, III
UCRL-JC-121653, "Resistivity Imaging Using A Steel Cased Well", C.J. Schenkel, Jun. 1995.
D.J. LaBrecque et al., "The Effects of Noise on Occam's Inversion of Resistivity Tomography Data", Geophysics, vol. 61, No. 2 (Mar.-Apr.) 1996, pp. 538-548.

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