Multiple attenuation with anisotropic high-resolution Radon transform
Fan Jingwen1, Li Zhenchun1, Song Xiangyu2, Zhang Kai1, Zhou Lihua3
1. School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
2. Research Institute, CNOOC, Beijing 100028, China;
3. No.1 Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
Abstract：For VTI media, large offset reflection events in marine seismic cannot meet hyperbolic time distance relationship, and primary wave and multiple wave energy cannot well focus in the Radon domain, which leads poor multiple attenuation. We propose an approach to solve this problem. First we introduce the anisotropic parameters into the time distance relationship when we describe VTI medium and marine large offset seismic time-distance curve relationship, so that the primary wave and multiple wave energy can focus well in the Radon domain. Then based on L1 norm sparse constraint in the model space, we introduce anisotropic high-resolution Radon transform based on conjugate guided gradient (CGG) algorithm to improve the Radon transform resolution. Tests on model and real data show that the proposed approach can effectively attenuate multiples.
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