Attenuation compensation in multicomponent Gaussian beam prestack depth migration
Wu Juan1,2, Chen Xiao-Hong1,2, Bai Min1,2, and Liu Guo-Chang1,2
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China.
2. National Engineering Laboratory of Offshore Oil Exploration, China University of Petroleum, Beijing 102249, China.
Abstract Gaussian beam prestack depth migration is an accurate imaging method of subsurface media. Prestack depth migration of multicomponent seismic data improves the accuracy of imaging subsurface complex geological structures. Viscoelastic prestack depth migration is of practical significance because it considers the viscosity of the subsurface media. We use Gaussian beam migration to compensate for the attenuation in multicomponent seismic data. First, we use the Gaussian beam method to simulate the wave propagation in a viscoelastic medium and introduce the complex velocity Q-related and exact viscoelastic Zoeppritz equation. Second, we discuss PP- and PS-wave Gaussian beam prestack depth migration algorithms for common-shot gathers to derive expressions for the attenuation and compensation. The algorithms correct the amplitude attenuation and phase distortion caused by Q, and realize multicomponent Gaussian beam prestack depth migration based on the attenuation compensation and account for the effect of inaccurate Q on migration. Numerical modeling suggests that the imaging resolution of viscoelastic Gaussian beam prestack depth migration is high when the viscosity of the subsurface is considered.
The research is financially supported by the National Natural Science Foundation of China (No. U1262207), the National Science and Technology Major Project of China (Nos. 2011 ZX05023-005-005 and 2011 ZX05019-006) and the PetroChina Innovation Foundation (No. 2013D-5006-0303).
Cite this article:
Wu Juan,Chen Xiao-Hong,Bai Min et al. Attenuation compensation in multicomponent Gaussian beam prestack depth migration[J]. APPLIED GEOPHYSICS, 2015, 12(2): 157-168.
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2015, Vol. 12 
