Method and apparatus for determining the conductivity of subsurf

Details Method and apparatus for determining the conductivity of subsurf Method and apparatus for determining the conductivity of subsurf

1991-05-30

1992-09-08

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

364422, G01V 318, G01V 338

Patent

active

051461676

ABSTRACT:
An improved induction well logging processing technique for determining conductivity measurements of subsurface earth strata. An in-phase conductivity signal and a quadrature conductivity signal are obtained from a downhole induction logging tool. The in-phase conductivity signal and the cubed square root of the in-phase conductivity signal are filtered by a first filter and a second filter, respectively. The outputs of the filters may be summed to provide a first conductivity signal having reduced environmental effects and indicating the conductivity of the earth formation under test. Additionally, the in-phase conductivity signal and the quadrature signal may be filtered and summed to provide a second conductivity signal. A weighted average of the first and second conductivity signals may be used as an indication of the earth formation conductivity.

REFERENCES:
patent: 4513376 (1985-04-01), Barber

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