Internal multiple elimination in the Vøring Basin: a comparison of two approaches

Summary Internal multiples contaminate weak primary reflection signals received from sub-basalt interfaces. We compare two methods of predicting internal multiples in seismic lines acquired in the Norwegian Sea. We compare a wave-equation based method that respects the structure but predicts only a subset of internal multiples corresponding to a downward bounce at the sea bottom, against a fast approximation which relies on a flat-earth assumption but predicts internal multiples generated at many subsurface boundaries all at once. The latter approach provides a better result by making a more realistic estimation of amplitudes, while compromising the accuracy of temporal dynamics.