Phasor processing of induction logs including shoulder and...

Details Phasor processing of induction logs including shoulder and... Phasor processing of induction logs including shoulder and...

G - Physics

01

V

324/9

G01V 3/28 (2006.01)

Patent

CA 1196059

ABSTRACT OF INVENTION A method and system for processing induction measurements of sub-surface formations taken by an induction logging system at various depths in a borehole is disclosed. The method reduces the unwanted contributions in each measure- ment from induction currents flowing in the formations spaced apart from each measurement depth. The spatial domain sonde response function obtained at zero conduc- tivity is Fourier transformed and truncated at a spatial frequency less than the spatial frequency at which the transformed function first goes to zero. A Kaiser window transfer function is then selected and the inverse Fourier transform of the ratio of the Kaiser window function to the transformed truncated sonde response function is formed to obtain a deconvolution filter function which when convolved with the sonde response function reduces the non-zero sidelobes in the system response function and thus reduces the shoulder effect.

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