Method of determining planar events from borehole or core...

Details Method of determining planar events from borehole or core... Method of determining planar events from borehole or core...

2007-06-26

2007-06-26

McElheny, Jr., D. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

Reexamination Certificate

active

11063945

ABSTRACT:
The present invention relates to a user-guided dip picking method from electrical borehole images using Hough Transform. It includes defining a top and bottom reference curve, applying the Hough Transform to the borehole image limited by the top and bottom reference dips so that the Hough Transform space is restrained in the neighborhood of the reference dips. A 1D average trace representing the extrema of the 3D Hough parameter space for each depth is then computed and the extrema exceeding a given threshold are search in this 1D trace. The position in the 3D Hough space of an extremum represents a dip event.

REFERENCES:
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patent: 5960371 (1999-09-01), Saito et al.
J. Illingworth and K. Kittler, “A Survey of the Hough Transform”, Computer Vision, Graphics, Image Processing 44 (1988), p. 87-116.
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Duda, R. P. and Hart, P. E., ACM, “Use of the Hough Transform to Detect Lines and Curves in Pictures”, vol. 15, No. 1 pp. 11-15, 1992.
Glossop K et al “An implemetation of the Hough transformation for the identification and labelling of fixed period sinusodial curves”, Computer Vision and Image understanding academic press USA, vol. 74, No. 1, 1999, pp. 96-100, p. 97, left hand column line 21—right hand column line 17.
Sarti A et al “Detection and characterisation of planar fractures using 3D hough transform” Signal processing elsevier for Eurasip Netherlands, vol. 82, No. 9, 2002, pp. 1269-1282, p. 1274 left hand column paragraph 3.1—p. 1282 righ hand column paragraph 4.

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