Akademik Veri Yönetim Sistemi
YERBILIMLERI = EARTH SCIENCES, cilt.46, sa.2, ss.65-76, 2025 (Scopus, TRDizin)
In this study, the pre-stack depth migration method was applied to obtain a depth section that provides theclosest approach to the subsurface. PSDM, is now used as a processing method in many seismic explorationsbecause of the increase of the hardware and related software capabilities. In geologically and tectonicallycomplex study areas, depth migration is essential to obtain accurate subsurface depth images. Therefore,after deriving the initial interval velocity depth section, both post-stack and prestack depth migration techniqueswere applied to improve subsurface imaging accuracy. Non-flatness in common depth point (CDP) gathersfrom PSDM indicated the need to update the interval velocity model in depth. Grid tomography and horizon-based tomography were used to refine the interval velocity depth section. PSDM was then reapplied using theupdated velocity model. These steps were iteratively repeated until the CDP gathers were flattened. Gridtomography was applied twice to update the interval velocity depth section. However, analysis of the depthsection from the second PSDM iteration (using grid tomography-derived velocities) showed that deeperreflections remained poorly resolved. Consequently, five additional PSDM iterations were performed withhorizon-based tomography-updated velocities, resulting in significantly improved imaging of both shallowlayers and the basement. Finally, depth sections from post-stack depth migration, initial PSDM, andsubsequent PSDM iterations were compared to highlight the critical role of PSDM in achieving a geologicallyrealistic model.