Abstract

In recent years exploration targets have become more challenging due to their deeper position and higher complexity. In order to map these targets correctly, accurate 3D PSDM is usually required. Interval velocity analysis in such areas becomes a critical process. The major concept of most velocity analysis procedures is that after PSDM, common image gathers (CIGs) should be flat if the migration was carried out with the correct velocity function. When the CIGs contain non-flat events the problem is how to relate this non-flatness to errors in the given velocity function.

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