LI ZhenChun,
LIU Qiang,
HAN WenGong et al
.2018.Angle domain converted wave Gaussian beam migration in VTI media.Chinese Journal Of Geophysics,61(4): 1471-1481,doi: 10.6038/cjg2018K0455
Angle domain converted wave Gaussian beam migration in VTI media
LI ZhenChun1, LIU Qiang1, HAN WenGong2, ZHANG Min1, WANG TianQi1, XIAO JianEn1, WU JunHong1
1. School of Geosciences, China University of Petroleum(East China), Shandong Qingdao 266580, China; 2. Geophysical Corporation, SINOPEC, Beijing 100029, China
Abstract：As targets are highly variable complex reservoirs, the difficulty of hydrocarbon exploration has been gradually increasing. Taking into account the wavefield information of both primary and shear waves, images with high resolution could be obtained by using the migration method of converted waves, which can help lithology identification, reservoir prediction and reservoir characterization. However, by far only the information of the primary wavefield is widely utilized in migration, which results in many drawbacks of the primary migration method especially when the prospecting area is complex.#br#On the basis of the anisotropic acoustic ray tracing algorithm, we derive the equations and develop a ray tracing algorithm of converted waves for an anisotropic medium. Furthermore, we summarize the imaging formula of converted waves in the angle domain for this medium.#br#Using this algorithm, we propose a Gaussian beam migration imaging method of converted waves in the angle domain for anisotropic VTI media. Numerical experiments on fault-block and complex structural models have verified its accuracy and efficiency. Besides, the proposed method is not only more efficient compared with the anisotropic Gaussian beam migration imaging method put forward, but also more accurate in comparison with the isotropic Gaussian beam migration imaging method. Moreover, the result of angle domain common imaging gathers could also provide useful information for migration velocity analysis.
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