Prestack Reverse Time Migration of Shot Profiles , by John T. Etgen

This paper presents a method for the migration of shot records. It is based upon previous work on the migration of stacked data. The method is a full depth migration allowing for velocity to vary laterally as well as vertically and has no dip limitations. Because two-way wave propagation is desired and the goal is to migrate primaries only, a matched impedance form of the scalar wave equation is used to suppress internal reflection (Baysal et. al.,1984). The method is implemented with high-order finite differences as discussed in the previous paper (Etgen, 1986). A synthetic example is shown demonstrating the method for a simple model with 2 reflectors. The method is applied to field data from the Gulf of Mexico in another example.


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