Method for automatic detection of planar heterogeneities...

G - Physics – 01 – V

Patent

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G01V 3/38 (2006.01) G01V 1/28 (2006.01)

Patent

CA 2279400

The invention concerns a method for automatic detection of planar heterogeneities intersecting the stratification of an environment from images of a borehole wall or developed core samples of said environment, which consists in using an original image defined in a system of axes (X1, Y1, Z1) associated with the borehole whose axis is Z1, said image containing, for a zone, traversed by the bore hole planar heterogeneities consisting of stratification planes (2 to 14) and planar heterogeneities (15 to 23) intersecting the stratification planes. The invention is characterised in that it consists in: determining a dominant orientation of the stratification planes located in at least on part of said original image; filtering the original image to eliminate the planar heterogeneities of the stratification planes (2 to 14) located in the dominant direction; determining on said filtered image at least two contour segments (15' to 23') of the heterogeneities intersecting the stratification planar heterogeneities.

Cette méthode de détection automatique des hétérogénéités planaires recoupant la stratification d'un milieu à partir d'images de paroi de puits ou déroulés de carottes dudit milieu, dans laquelle on utilise une image d'origine définie dans un système d'axes (X1, Y1, Z1) lié au puits dont l'axe est Z1, ladite image contenant, pour une zone du milieu traversé par le puits, des hétérogénéités planaires constituées par des plans de stratification (2 à 14) et par des hétérogénéités planaires (15 à 23) sécantes aux plans de stratification, et elle est caractérisée en ce qu'elle consiste à: déterminer une orientation dominante des plans de stratification situés dans au moins une partie de ladite image d'origine, filtrer l'image d'origine pour éliminer les hétérogénéités planaires des plans de stratification (2 à 14) situés dans la direction dominante, déterminer sur ladite image filtrée au moins des segments de contour (15' à 23') des hétérogénéités sécantes aux hétérogénéités planaires de stratification.

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