Abstract
In conventional seismic processing, the normal moveout (NMO) equation is used for velocity analysis. The NM0 equation gives erroneous velocities when the subsurface does not consist of flat and horizontal layers. In this paper, velocity analysis and @aging are combined in one step. This scheme uses migration itself as a velocity indicator. Because migration can be formulated for any velocity function, velocity analysis methods which are based on migration are capable of handling arbitrary structures. It should be stressed that the velocity used in migration is the interval velocity, which is what we need to characterize the medium. After migration with the correct velocity model, an image in a common-receiver gathei (CRG) is aligned horizontally regardless of structure. If the migration velocity is lower than the velocity of the medium, events curve upward, where if the migration velocity is higher than the velocity of the medium, events curve downward. The process discussed in this paper uses this principle to estimate the error in migration velocity.
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