Abstract

Two-dimensional migrated time interpretations are used in a novel application of map migration. This is done by following the seismic migration along the 2-D lines by a map migration in a direction orthogonal to the lines, thus achieving a fully 3-D migrated representation of the subsurface. In addition to modifying the 2-D times and positions, this approach corrects the amplitudes of the 2-D migrated data, which suffer from being corrupted by focusing or defocusing because of the reflector curvature orthogonal to the line direction. A Gulf of Mexico case study illustrates how this map migration technique simplifies the time structure map and explains anomalous amplitude variations.

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