Secondary field dielectric constant and/or resistivity well logg

Details Secondary field dielectric constant and/or resistivity well logg Secondary field dielectric constant and/or resistivity well logg

1984-03-05

1987-08-18

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

G01V 330, G01V 328, G01V 310, G01V 318

Patent

active

046879951

ABSTRACT:
Apparatus for determining the dielectric constant and/or resistivity of earth formations traversed by a borehole includes a transmitter which transmits electromagnetic energy into the earth formation from a first location in the borehole at a frequency which enables the electromagnetic energy to propagate throughout the surrounding earth formations. Receivers receive electromagnetic energy at two locations in the borehole which are spaced longitudinally from the transmitter provide signals representative of the total electromagnetic fields at the receiver locations. Circuitry determines the dielectric constant and/or resistivity of the formations in accordance with a secondary field ratio and a phase difference derived from the signals provided by the receivers.

REFERENCES:
patent: 2919397 (1959-12-01), Morley
patent: 4107598 (1978-08-01), Meador et al.

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