Measuring and evaluating surface potentials for determining the

Details Measuring and evaluating surface potentials for determining the Measuring and evaluating surface potentials for determining the

1986-08-13

1988-07-26

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

324323, G01V 338

Patent

active

047603402

ABSTRACT:
At least one string of several spaced measuring probes for the measurement of surface potentials is laid on the surface of the earth in such a manner that several probes are located outside and several probes are located inside the area of the surface over a reservoir. The potentials measured by all probes are polled in a sequence of periodic cycles. The signals from each probe are, during each cycle, filtered to separate higher-frequency changes in the signals from substantially lower-frequency changes in the signals. For the higher-frequency changes in the signals from each probe, an average and/or a sum are determined as a measure of the higher-frequency amplitudes for each probe. The higher-frequency amplitudes for the probes of a string of measuring probes are compared and the location at which the higher-frequency amplitudes for two adjacent probes change abruptly is taken to be the hydrocarbon/water interface in the underground reservoir.

REFERENCES:
patent: 2368218 (1945-01-01), Hayes
patent: 3496768 (1970-02-01), Boucher
patent: 4449099 (1984-05-01), Hoehn
Buchheim et al., Textbook of General Physics Part II, 1958, pp. 10-15.
Chemical & Engineering News, "Electrochemical Readings Detect Oil", vol. 49, No. 21, May 24, 1971, pp. 32-33.

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