Method for enhancing vertical resolution of nuclear well logging instruments
US5506769A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1994 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Aug 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.