Abstract: The carbonate rocks in Tarim basin are of the obvious anisotropy. Using the conventional isotropic migration method may not only result in error of imaging position, but also affect the quality of seismic imaging, the precision of time-depth transformation and AVO analysis, etc. Taking the actual seismic data of carbonate rocks in Tarim basin as an example, this paper mainly discussed the anisotropic prestack migration technique, the method for evaluating anisotropic parameters and the processing flow of anisotropic prestack migration. The more accurate anisotropic velocity and the preserved abundant far-offset trace information allowed the precision of migration velocity and migration operator to be improved by evaluating the more accurate migration velocity field and reserving far-offset trace information. At the same time, the seismic imaging quality of the carbonate rocks can be effectively increased, and the "bead" reflectance, the faults and the break points appeared more clearly, thus providing a better gather for AVO inversion and the precision of reservoir description.

Key words: anisotropy, VTI media, carbonate rock, prestack time migration, prestack depth migration