Abstract

Velocity-depth modelling using conventional normal move-out (NMO) analysis in a complex geologic setting is very challenging. Additionally, refraction arrivals associated with the low sediment velocities and deep water only appear at far offsets, containing information about deeper structures. In this study, we therefore present an innovative method where a 12 km long towed, downward continued streamer seismic data and the ocean bottom seismometer data are jointly inverted to determine a high-resolution near surface velocity-depth model. The quality of the inverted velocity is then justified performing a prestack depth migration using the streamer data. Our findings infer that the velocity-depth model derived from jointly inverted tomography study produces a detail pre-stack depth migrated image.