Deconvolution filter for induction log processing
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 measurement from induction currents flowing in the formations spaced apart from each measurement depth. The spatial domain sonde response function obtained at zero conductivity 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.
- Assignee:
- Schlumberger Technology Corporation
- Patent Number(s):
- US 4467425
- OSTI ID:
- 6200436
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DATA PROCESSING
DIGITAL FILTERS
ELECTRIC LOGGING
FOURIER TRANSFORMATION
FUNCTIONS
INDUCTION LOGGING
INTEGRAL TRANSFORMATIONS
NATURAL GAS WELLS
OIL WELLS
PROCESSING
RESPONSE FUNCTIONS
TRANSFER FUNCTIONS
TRANSFORMATIONS
WELL LOGGING
WELLS