Method for adaptive filtering of well logging data

Details Method for adaptive filtering of well logging data Method for adaptive filtering of well logging data

1997-03-05

1998-11-24

Barlow, John

Data processing: measuring, calibrating, or testing

Measurement system

Measured signal processing

364724011, 36472419, G06F 1700

Patent

active

058421580

ABSTRACT:
The invention described herein provides for an intelligent or "adaptable" filtering method that could be applied when filtering log data. In the present invention, for a given filter model, the adaptive filtering technique differentiates between true changes in the formation or borehole quantity measured and what can be considered to be just a "statistical fluctuation". So, when in long constant-value intervals (data deviations do not exceed those predicted by statistical theory) the filter will automatically increase the number of filter levels used, thereby providing a large reduction (smoothing) of the statistical variations. However, when approaching a spot where there is a true change in the quantity being measured (data deviations over and above those predicted by statistics) the filter will automatically and smoothly decrease, on both sides of this spot, thereby preserving the sharpness of the bed boundary or borehole fluid contact and also preserving the true shape of a thin geologic bed.

REFERENCES:
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patent: 5144595 (1992-09-01), Graham et al.
patent: 5303173 (1994-04-01), Mori et al.
patent: 5432723 (1995-07-01), Chen et al.
Savoji, M.H., "Performance of the Variable-Length Stocharstic Gradient Lattice Filter in Adaptive Noise Cancellation of Nonstationary Signals--A Simulation Case Study", Signal Processing, vol. 13, No. 4, Dec. 1987, pp. 361-375.

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