Abstract

True-azimuth 3D SRME techniques have proved their worth in deepwater areas that have complex water-bottom topography. However, because they take account of the true geometry of the recorded data, they also outperform 2D and nominal-azimuth 3D SRME algorithms in areas of shallower water. In regions with strong water-layer multiples, such as the Norwegian Sea, the improved multiple predictions given by true-azimuth 3D SRME can result in substantially improved data quality. Standard 3D SRME techniques accurately predict the kinematics of the multiples, but not their amplitudes. This is a disadvantage in the Norwegian Sea where low-order peg-leg multiples and higher-order simple reverberations interfere at typical reservoir depths. Iterative 3D SRME techniques can, in principle, overcome these issues, and test results on real 3D seismic data sets are promising.

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