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| | Abstract | | In recent years, several new techniques have been developed for multiple attenuation. SRME, Surface-Related Multiple Elimination, is a real technological breakthrough and extended to 3D acquisition geometry data without any a-priori information such as the geometrical spreading factor or source signature. PRT, Parabolic Radon Transform, is widely accepted technique for long-period multiple attenuation. Using real 3D data, we re-evaluate the cascaded processing sequence and applicability of these methods. 3D-SRME precisely works for the cases where the moveout difference between primaries and multiples is relatively small, or the diffraction multiples are predominant. Near- to middle-offset multiples in particular, are better attenuated with 3D-SRME than with PRT. On the other hand, PRT works nicely on far-offset range which is required for the imaging of deep target. In conclusion, 3D-SRME and PRT should be complementary approaches. 3D-SRME followed by the subsequent PRT shows excellent results for the attenuation of long-period multiples, and accommodates the complexity of the multiple generator and out-of-plane effects. |
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