Uncertainties in the 4D Seismic Signature due to Seawater Velocity Variations

A041 Uncertainties in the 4D seismic signature due to seawater velocity variations Abstract 1 Seawater velocity variations are known to influence the quality of seismic especially in deepwater areas. Here this topic is extended to evaluate the effect on reservoir monitoring. A 3D data set from the Gulf of Mexico has been corrected for seawater velocity variations and the corresponding time and amplitude perturbations are measured. From this a 4D synthetic data set is modelled for realistic reservoir production scenarios. The 4D modelled seismic is perturbed using similar errors to those measured on the real data in order to mimic