Band‐limited ray tracing
Band‐limited ray tracing
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DOI：
10.1111/1365-2478.12055
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发表时间：
2013-11
影响因子：
2.6
通讯作者：
C. Yarman;Xin Cheng;K. Osypov;D. Nichols;M. Protasov
中科院分区：
文献类型：
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作者：
C. Yarman;Xin Cheng;K. Osypov;D. Nichols;M. Protasov
我们开发了一种新的射线追踪方法，即带限射线追踪，其目的是克服标准高频射线追踪在包含复杂界面的复杂速度模型中的一些局限性。带限射线追踪基于透射波场的基尔霍夫积分表示。在我们的讨论中，我们考虑了声波方程的基尔霍夫积分，然而，我们的方法可以推广到弹性波方程的基尔霍夫积分。与有限差分波传播相比，新方法比传统射线追踪更准确地捕捉波的运动学，同时保持在射线追踪框架内，而不需要处理或更改原始模型。我们提出了带限射线追踪的理论，并证明了它的能力。我们比较了使用传统射线追踪和带限射线追踪方法获得的克希霍夫偏移实例。我们的合成示例表明，带限射线追踪提供了比传统射线追踪更好的结果，特别是在估计波前方面。在真实的数据示例的情况下，结果彼此相当，同时呈现不同的聚焦特性。不同的聚焦特性表明，有必要执行一个完整的模型构建工作流程，对真实的数据应用程序进行扩展评估。
We develop a new ray‐tracing method, namely, band‐limited ray tracing, which aims to overcome some of the limitations of standard high‐frequency ray tracing in complex velocity models that contain complex interfaces. Band‐limited ray tracing is based on the Kirchhoff integral representation of the transmitted wavefield. In our discussion we consider the Kirchhoff integral for the acoustic wave equation, however, our method can be extended to the Kirchhoff integral for the elastic wave equation. When compared to finite‐difference wave propagation, the new method captures the wave kinematics more accurately than conventional ray tracing while staying within the ray‐tracing framework, without requiring processing or alteration to the original model. We present the theory of band‐limited ray tracing and demonstrate its capability. We compare the Kirchhoff migration examples obtained using conventional ray‐tracing and band‐limited ray‐tracing methods. Our synthetic example demonstrates that band‐limited ray tracing provides better results than conventional ray tracing, especially in estimating wavefronts. In the case of the real data example, the results are comparable to each other while presenting different focusing characteristics. The different focusing characteristics indicate the necessity of performing a full model building workflow for an extended evaluation on real data application.