Method of determining dips and azimuths of fractures from borehole images
First Claim
Patent Images
1. A method for detecting planar structures such as fractures and formation beddings in a borehole, as well as geometric patterns such as elliptical vugs from a borehole image using a Hough transform technique, comprising the steps of:
- a) detecting edges and their associated slopes in a borehole image to obtain edge slope/orientation information;
b) preparing an accumulator array by specifying its ranges and array size; and
c) using said edge slope/orientation information for further constraining the Hough transform.
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Abstract
A borehole image interpretation method that utilizes a Hough transform technique is described. The method can detect planar structures such as fractures and formation beddings in the borehole, as well as geometric patterns such as elliptical vugs.
91 Citations
13 Claims
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1. A method for detecting planar structures such as fractures and formation beddings in a borehole, as well as geometric patterns such as elliptical vugs from a borehole image using a Hough transform technique, comprising the steps of:
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a) detecting edges and their associated slopes in a borehole image to obtain edge slope/orientation information; b) preparing an accumulator array by specifying its ranges and array size; and c) using said edge slope/orientation information for further constraining the Hough transform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting planar structures such as fractures and formation beddings in a borehole, as well as geometric patterns such as elliptical vugs from a borehole image using a Hough transform technique, comprising the steps of:
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a) detecting edges and their associated slopes in a borehole image to obtain edge slope/orientation information; b) preparing an accumulator array by specifying its ranges and array size; c) tracing a curve for each detected edge, as a function of depth of said borehole; and d) incrementing a content of each array intersecting the curve.
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Specification