OTC 16945 True 3D Data-driven Multiple Removal ... - PGS

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10 OTC a) b) c) d e) Figure 9: a) Typical shot gather after pre-processing. b) Predicted multiples from 2D SRME. c) Predicted multiples using 3D SRME. Note that the multiples are better aligned with the multiples in the input data. d) Same shot gather after subtraction of the 2D multiples. e) Shot gather after subtraction of the 3D multiples. Note the better removal of multiples while preserving the primaries. a) b) c) Figure 10: a) Two zoomed sections of the stack after pre-processing. b) Zoomed stacks of the predicted multiples from 2D SRME. Note that the 2D multiples are predicted too late in time. c) Stacks of the predicted multiples using 3D SRME. Note that the 3D multiples are better aligned with the multiples in the pre-processed data.
OTC 11 d) e) Figure 10: d) Stacked section after prestack adaptive subtraction of the 2D multiples. Note that the first-order water bottom multiple, and the multiples off the elevated structure in the deeper section remain clearly visible. e) Stacked section after prestack subtraction of the 3D multiples. Note the better removal of the water bottom multiple in the shallow section. Also, reverberations from the elevated structure in the deeper section have been removed better, as well as the diffracted multiples generated by shallow subsurface diffractors. The gathers shown in Figure 9 correspond to a CMP location of about 50.
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OTC 16945 True 3D Data-driven Multiple Removal ... - PGS

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