Three-dimensional velocity-depth models are playing an increasingly important role in our seismic data processing and interpretation. In addition to being critical input for 3D depth migrations, the models are becoming an integral part of our structural interpretations of complex prospects. Even when working with 2D seismic data, a 3D model enforces consistency across interpretations of individual lines. This talk presents our methods of constructing and refining velocity models for a series of examples ranging in complexity from a simple four-Iayer model for West Africa, to a more intricate faulted model for West Africa, to a complex Thrust Belt model. All of these examples begin with 2D analysis and then advance to fully 3D model building.


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