Model-driving shallow-water-layer multiple attenuation in τ-p domain
Feng Quanxiong1,2, Wang Yanchun1, Li Sanfu3, Dan Zhiwei3, Zhang Xingyan3, Fang Zhongyu3
1. China University of Geosciences (Beijing), Beijing 100086, China;
2. CNOOC International Limited, Beijing 100010, China;
3. Geophysics Department, Ener-Tech Engineering Research Institute, CNOOC, Zhanjiang, Guangdong 524057, China
Abstract：To attenuate shallow -water-layer multiples between the sea surface and the ocean bottom remains a difficulty of marine seismic processing. Conventional methods such as predictive deconvolution and SRME, have significant limitations. We propose in this paper a new method for removing this kind of multiples, called model-driven shallow-water-layer multiple attenuation. We first build an initial model in domain with water velocity and depth, and then predict shallow water-layer multiple with wavelength continuation method. Finally we attenuate multiples from seismic data with self-adaption subtraction. Both model tests and real data processing show that the proposed method can attenuate shallow-water-layer multiples.
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