Until now, the majority of RTM applications were performed on NAZ data for isotropic and VTI media. The development and applications of TTI RTM faced two hurdles: the difficulty in numerical formulation and high computing cost, and the lack of azimuthal information of NAZ data to support the derivation of the velocity and corresponding TTI parameters. Both hurdles are gradually disappearing. Zhang and Zhang showed that a stable 3D TTI RTM implementation is achievable for imaging complex structures such as subsalt in Gulf of Mexico. Because WAZ data with abundant azimuthal information are becoming the standard data set for subsalt imaging, using TTI RTM on WAZ data will continue to increase. Topics related to TTI RTM remain a focus within the seismic imaging community. Improving the ! derivation of TTI anisotropic parameters from WAZ data and extending full wavefield inversion for TTI media are among the most active areas of study.
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