Lowrank one-step wave extrapolation for reverse-time migration

RTM of BP 2007 TTI Data Set

bptti-img
Figure 16. RTM image obtained using BP 2007 anisotropic data set. Acoustic approximation in TI medium is used to perform wave extrapolation.

Finally, we test lowrank one-step RTM using BP 2007 anisotropic benchmark dataset (Figure 11). The grid spacing is $18.75\;m$ in the horizontal direction and $12.5\;m$ in the vertical direction. The time step size is selected to be $4\;ms$ . We employ the acoustic approximation (Alkhalifah, 1998,2000; Fomel, 2004) to calculate the qP-wave phase velocity. The sedimentary layers, salt boundaries, anticline and fault surfaces are clearly imaged by the lowrank one-step RTM method (Figure 16).

Lowrank one-step wave extrapolation for reverse-time migration