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| Anisotropic velocity analysis based on shift hyperbolic equation |
| Wang Shiqing, He Yushan, Wang Jianmin, Chen Xiujuan, Zhang Rui |
| First Ueophysical Exploration Division, Daqing Drilling and Exploration Engineering Company, Daqing, Heilongjiang 163357, China |
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Abstract An anisotropic velocity analysis based on shift hyperbolic equation is proposed in the paper.In the light of non-elliptical feature of shift hyperbolic NMO formula,this paper discusses the relation between shift parameter and non-ellipse parameter.Two restrained parameters describing reflection hyperbolic curve in local coordinate system are introduced,and related computing formula is deduced.This process sequence of anisotropic highdensity velocity analysis solves NMO problems which cannot be corrected at far offset gathers by NMO,and improves the imaging of prestack time migration.Different examples show that the method can accurately correct far offset reflection wave, and provide high quality CRP gathers for prestack inversion.
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Received: 04 June 2012
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2013, Vol. 48 
