Inversion of multicomponent seismic data of the Santos Basin.

The velocity analysis is conventionally performed fitting the curve generated by the travel-time approximation to the reflections identified on seismic records. The hyperbolic approximation developed is conventionally used, however it is not valid to nonhyperbolic reflection events observed in multicomponent seismic data. A comparison was accomplished aiming to evaluate the behavior of some nonhyperbolic multiparametric travel-time approximations used to perform the velocity analysis of multicomponent seismic data in a model of the pre salt of the Santos Basin using OBN technology. The complexity of the objective function was also analyzed for these data. The nonhyperbolic multiparametric approximations evaluated have three variables. For this reason, this problem was treated as an inverse problem according to an optimization criterion. Due to the results obtained, it were determined the approximations which presented the best fitting for the reflection events. The approximation which presented the best fitting in a general form was determined. Further, the residual function maps were analyzed to determinate which approximation is less complex to perform the inversion.