Electromagnetic subsoil prospecting process using an asymptotic

Details Electromagnetic subsoil prospecting process using an asymptotic Electromagnetic subsoil prospecting process using an asymptotic

1978-05-08

1981-03-24

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324345, G01V 310

Patent

active

042583225

ABSTRACT:
In a sub-soil prospecting process a vertical magnetic field transmitter dipole and a receiver dipole are placed on the ground, away from each other. The receiver dipole is oriented to detect a radial horizontal magnetic field relative to the transmitter dipole. At low frequencies, the magnetic field detected assumes asymptotic values, and by measuring these values an apparent alternating current resistivity of the sub-soil is deduced. By varying the transmitter-receiver distance, and by simultaneously using a direct current electric prospecting process, a sub-soil model is determined which is less ambiguous than those supplied by electric or induction prospecting alone.

REFERENCES:
patent: 1718352 (1929-06-01), Guilford
patent: 1843407 (1932-02-01), Sundberg
patent: 2731596 (1956-01-01), Wait et al.
patent: 3548299 (1970-12-01), Duroux et al.
patent: 3551798 (1970-12-01), Enenshtein et al.
patent: 3936728 (1976-02-01), Ghosh et al.
Enenshtein, B. S., "Interpretation Two-Layer Curves . . . for P.sub.2 <P.sub.1 ", Bull. Acad. of Sci., USSR; Geoph. Series; No.9, (Translation pp. 733-736).
Duprat et al., "Exemples . . . L'Interpetation de Sondages Electriques",Geophysical Prospecting, vol. 21, No. 3, Sep. 1973, pp. 543-559.
Kunetz et al., "Traitement . . . of Electrical Soundings", Geophysical Prospecting, vol. XVIII, No. 2, Jun. 1970, pp. 157-197.
Rocroi, J. P., "Contribution . . . en Prospection Electrique", Geophysical Prospecting, vol. 18, No. 4, 1975, pp. 765-778.

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