Measurement of in-phase and out-of-phase components of low frequ

Details Measurement of in-phase and out-of-phase components of low frequ Measurement of in-phase and out-of-phase components of low frequ

1990-02-05

1991-11-12

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324346, 324369, G01V 328, G01V 324

Patent

active

050651005

ABSTRACT:
This invention relates to the measurement of the longitudinal components of low frequency A.C. magnetic fields from within cased boreholes which are used to measure geophysical properties of geological formations. The applied A.C. magnetic fields are generated by passing low frequency A.C. current through insulated wires or by conducting low frequency A.C. current through geological formations, either of which are examples of conducting A.C. currents through different "circuit pathways". The currents generating the applied A.C. magnetic fields are in the frequency range between 0.001 Hz and 20 Hz. The measured longitudinal components of the resulting total A.C. magnetic fields within the cased boreholes are responsive to various geophysical parameters which include the resistivities of the portions of the geological formations subject to said applied A.C. magnetic fields. Measurements of the in-phase parts and the out-of-phase parts of the longitudinal field components are defined in relation to the phases of the A.C. currents conducted through the "circuit pathways".

REFERENCES:
patent: 4547733 (1985-12-01), Thoraval
patent: 4720681 (1988-01-01), Sinclair
patent: 4748415 (1988-05-01), Vail, III
patent: 4901023 (1990-02-01), Vail, III

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