Table‐Driven 3‐D Angle‐Domain Imaging Approach for Kirchhoff Prestack Time Migration
Table‐Driven 3‐D Angle‐Domain Imaging Approach for Kirchhoff Prestack Time Migration
复制标题
DOI：
10.1002/cjg2.1366
复制
发表时间：
2009-03
期刊：
影响因子：
--
通讯作者：
Jiubing Cheng;Nan Wang;Z. Ma
中科院分区：
文献类型：
--
作者：
Jiubing Cheng;Nan Wang;Z. Ma
为了克服常规基尔霍夫时间偏移技术的一些不足，并为幅度-入射角-方位角(AVA/AVAZ)分析提供更有力的支持，我们基于横向均匀介质中经典的射线追踪方程，发展了一种三维角度域成像方法。首先利用改进的光线追踪算法建立了射线的单向旅行时间和起始角的数值表。一旦估计了反射面处的双向走时、加权因子、平均方位角和局部入射角度，就可以通过叠加Kirchhoff偏移过程中的脉冲响应来生成三维结构图像和角域共像道集。与传统方法不同，该方法的实现考虑了地震波在三维横向不变介质中的射线弯曲和传播特性。因此，它有助于更准确地提取振幅和时差随方位角和入射角的变化。模拟和实际数据算例表明了该方法的优越性和实用性。
To overcome some of the shortages of conventional Kirchhoff presatck time migration technique and to provide more powerful supports for amplitude versus incidence-angle and azimuth (AVA/AVAZ) analysis, we develop a 3-D angle-domain imaging approach based on the classical ray tracing equations in laterally homogeneous media. Numerical tables of one-way travel times and take-off angles of rays are firstly established by a modified raytracing algorithm. Once the two-way travel times, weighted factors, average azimuth and local incidence angles at the reflectors are estimated, 3-D structural images and angle-domain common-image gathers are generated through superposition of impulse responses in the process of Kirchhoff migration. Unlike the conventional approach, the implementation of this method has taken ray bending and propagation property of seismic waves in 3-D lateral invariant media into account. As a result, it helps to extract variations of amplitude and moveout versus azimuth and incidence-angle more accurately. Synthetic and real data examples demonstrate the advantage and practicability of this technique.