3D traveltime computation for quasi-P-wave in orthorhombic media using dynamic programming
3D traveltime computation for quasi-P-wave in orthorhombic media using dynamic programming
复制标题
使用动态规划计算正交介质中准 P 波的 3D 走时
DOI：
10.1190/geo2016-0558.1
复制
发表时间：
2018
期刊：
影响因子：
3.3
通讯作者：
Wang Xingjian
中科院分区：
文献类型：
--
作者：
Hu Jiangtao;Cao Junxing;Wang Huazhong;Liu Shaoyong;Wang Xingjian
裂隙区，如断层区，通常具有正交各向异性。忽略正交各向异性可能会通过创建井模糊和模糊图像来劣化地下图像。走时计算对于许多处理技术是必不可少的，例如深度成像和层析成像。求解射线追踪系统和程函方程是计算各向同性介质走时的两种常用方法。然而，由于射线追踪系统变得复杂，程函方程变得高度非线性，它们在正交介质中的应用变得复杂。本文提出了一种基于动态规划的正交介质三维走时计算方法。为了避免求解复杂的射线追踪系统和非线性程函方程，该方法采用时差近似下的显式群速度来描述波的传播，并利用费马原理计算走时。类似于深度外推，它计算t...
ABSTRACTA fractured area, such as a fault area, usually induces orthorhombic anisotropy. Ignoring orthorhombic anisotropy may degrade the subsurface image by creating a well mistie and blurring the image. Traveltime computation is essential for many processing techniques, such as depth imaging and tomography. Solving the ray-tracing system and eikonal equation are two popular methods for traveltime computation in isotropic media. However, because the ray-tracing system becomes complex and the eikonal equation becomes highly nonlinear, their applications in orthorhombic media become complex. We have developed an alternative 3D traveltime computation method in orthorhombic media based on dynamic programming. To avoid solving the complex ray-tracing system and nonlinear eikonal equation, it adopts an explicitly expressed group velocity from the moveout approximation to describe the propagation of the wavepath and computes the traveltime by Fermat’s principle. Similar to depth extrapolation, it computes the t...