Method for enhancing vertical resolution of nuclear well logging instruments
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United States of America Patent
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Apr 9, 1996
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N/A
app pub date -
Aug 2, 1994
filing date -
Oct 5, 1990
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Abstract
A method for enhancing the vertical resolution of a nuclear well logging tool is set forth. A detector of nuclear radiation is moved along a well borehole to produce measurement data r(z) as a function of depth in the borehole. The data r(z) and a system response function g(z) are transformed into spatial frequency domain (f) counterparts of r(z) and g(z), the counterparts being R(f) and G(f). A window W(f) in the spatial frequency domain based on the function R(f) is defined. That smoothly eliminates the high frequency noise. A new profile function P(f) is obtained by dividing the filtered R(f) by the function G(f) to deconvolve R(f). The inverse Fourier transform of P(f) yields a vertically enhanced profile p(z) in the depth domain.
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