Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1990-11-13
1993-02-02
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
364422, G01V 328, G01V 318, G01V 338
Patent
active
051840790
ABSTRACT:
In a well logging truck computer which phroduces an induction log, a dip correction algorithm, stored in a memory of the computer, corrects an error introduced in the induction log by dip effect. The dip effect error is introduced into the induction log when an array induction tool is disposed in a deviated borehole at an apparent dip angle with respect to a formation having a plurality of bedding planes, and subsequently develops formation parameter data. This formation parameter data, which contains the dip effect error, is displayed on the induction log. The dip effect algorithm eliminates the dip effect error by multiplying or convolving inverse filters "h" as a function of dip angle "a" with a plurality of the formation parameter data "sigma(j-n)" to thereby produce a corresponding plurality of corrected formation parameter data "sigma.sub.F ", the corrected formation parameter data being reproduced on an induction log output record medium. The inverse filters "h" are computed using log response functions derived from simple dipping formation models.
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Bouchard John H.
Garrana Henry N.
Schlumberger Technology Corporation
Snow Walter E.
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