Method for evaluating a borehole formation based on a formation

Details Method for evaluating a borehole formation based on a formation Method for evaluating a borehole formation based on a formation

1991-04-05

1992-09-01

Wieder, Kenneth A.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

364422, G01V 330

Patent

active

051442450

ABSTRACT:
The method evaluates borehole formations using corrected formation resistivity logs obtained from a formation evaluation tool. In accordance with the present invention the method corrects the error in the amplitude ratio resistivity curve R.sub.ar and the phase difference resistivity curve R.sub.pd thereby providing a more accurate formation resistivity log. The method of this invention employs a low frequency mixing law such as Archie's equation in combination with a high frequency mixing law such as Complex Refractive Index Method (CRIM) to correct the measurements of wave propagation type formation evaluation tools for the effects of the dielectric constant on the tool's measured parameters.

REFERENCES:
patent: 4739262 (1988-04-01), Fleetwood
patent: 4899112 (1990-02-01), Clark et al.
patent: 5001675 (1991-03-01), Woodward

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