Integrated Prestack Depth Migration of VSP and OBS Data in Angle Domain

Vertical Seismic Profiling (VSP) surveys not only generate higher fidelity data when compared with ocean bottom sensors (OBS), but VSP data can also be analyzed for reservoir properties via imaging and inversion for seismic attributes. This paper describes a Kirchhoff prestack depth migration (PSDM) technique for both VSP and OBS data using a common velocity model to produce angle domain common image gathers (ADCIGs) on a unified grid. Further processing of ADCIGs in a post-migration step is demonstrated to be an effective means of integrating partial images migrated for VSP and OBS data, and has produced results superior to the conventional workflow.