The Vøring Basin contains a number of challenges for effective model building, including high-contrast carbonate muds called oozes. These are difficult to resolve unless one uses a full wavefield FWI.
A combination of transmitted and reflected energy, in an accurate FWI-driven model, can isolate the bodies and counteract the distortion and dimming effects.
The model building was achieved in a short timeframe, as the starting point for FWI was a 1D model comprising four layers. Cycle-skipping was mitigated using a multi-scale approach starting with ultra-low frequencies enabled by deep-tow acquisition. The resulting model isolated the ooze bodies. The migration with the FWI model created a seismic dataset of striking clarity, free of the effects of the ooze.
Initial model (left) and final FWI model (right) co-rendered on a crossline (top) and inline (bottom). The visible seismic data has been migrated with its respective model. Slide to observe the isolation and removal of the distorting effects of the ooze bodies in the FWI model and seismic