3D PSDW prestack depth migration

Based on a new double-wavefield equation and its pseudospectral solution, we have developed a new 3-D prestack depth migration called PSDW migration, which is about a factor of 2 faster than traditional reverse-time migration but retains all the advantages of the reverse-time migration, such as the ability to handle strong velocity variations and to image all dips including turning waves. A comparison between a multipathing Kirchhoff prestack depth migration and the PSDW migration over the same line of the 3-D SEG/EAGE salt model, demonstrates that the PSDW migration is comparable in speed to the Kirchhoff migration and provides images of higher quality in subsalt areas.