Depth Migration of Complex Surfaces with GOCAD: Study of the Curvature of a Triangulated Surface

Arnaud Berlioux

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The depth migration of time-migrated surfaces by demigration with GOCAD is inaccurate in the case of complex surfaces, such as folded horizons, in areas where the curvature of the surface reverses its sign. I believe this problem can be avoided by cutting the original complex surface into pieces for which the depth migration is accurate. To do so, I propose an algorithm to study the sign of the curvature of the GOCAD surface in order to divide it up properly before performing the depth migration. Putting the depth-migrated pieces back together, I should then obtain a depth-migrated surface more representative of the true geology than the direct depth-migrated surface.

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