Prestack Pluto 1.5

Figure  presents a 2D prestack RWE migration test for the Pluto model. The top and middle panels show the elliptic coordinate and Cartesian migration results using $80^{\circ}$ FD extrapolators. The bottom panel presents another Cartesian migration, but generated with lower-order phase-shift plus interpolation (PSPI) extrapolators. Note that the steeply dipping flanks on the left-most salt body are well-imaged in the upper two panels, but not as well in the lower panel. This suggests that higher-order extrapolators, rather than a new coordinate system, are needed to accurately image this salt flank. The image of the multiples beneath this salt body is more accurately migrated in the elliptic coordinate system, suggesting improved extrapolation has occurred in elliptic coordinates.

 

PLUTO
Figure 4 Pluto migration images for various coordinate systems and propagators. Top: Elliptic coordinates with FD propagators. Middle: Cartesian coordinates with FD propagators. Bottom: Cartesian coordinates with PSPI propagators.