基于时移双曲方程的各向异性速度分析

本文针对时移双曲线NMO方程的非椭圆特性,讨论了时移参数和非椭圆参数之间的关系,引入在局部坐标系中描述反射双曲线形状的两个约束参数,并推导出相关计算公式,建立各向异性高密度速度分析处理流程,解决了远炮检距动校道集无法校平的问题,提高了叠前时间偏移的成像精度。文中通过不同实例说明该方法能够解决远炮检距情况下反射波准确归位问题,并能为叠前反演提供高质量的CRP道集。

Anisotropic velocity analysis based on shift hyperbolic equation

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.