Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Patent
1997-09-26
2000-07-11
McElheny, Jr., Donald E.
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
G06F 1900
Patent
active
060886552
ABSTRACT:
Electrical resistance tomography (ERT) produced from measurements taken inside a steel cased borehole. A tomographic inversion of electrical resistance measurements made within a steel casing was then made for the purpose of imaging the electrical resistivity distribution in the formation remotely from the borehole. The ERT method involves combining electrical resistance measurements made inside a steel casing of a borehole to determine the electrical resistivity in the formation adjacent to the borehole; and the inversion of electrical resistance measurements made from a borehole not cased with an electrically conducting casing to determine the electrical resistivity distribution remotely from a borehole. It has been demonstrated that by using these combined techniques, highly accurate current injection and voltage measurements, made at appropriate points within the casing, can be tomographically inverted to yield useful information outside the borehole casing.
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patent: 4820989 (1989-04-01), Vail, III
patent: 4837518 (1989-06-01), Gard et al.
patent: 4882542 (1989-11-01), Vail, III
W. Daily et al., "Cross-Borehole Resistivity Tomography", Geophysics, vol. 56, No. 8 (Aug. 1991), p. 1228-1235.
W. Daily et al., "Electrical Resistivity Tomography of Vadose Water Movement", Water Resources Research, vol. 28, No. 5, p. 1429-1422, May 1, 1992.
Daily William D.
Ramirez Abelardo L.
Schenkel Clifford
Carnahan L. E.
McElheny Jr. Donald E.
The Regents of the University of California
Thompson Alan H.
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