Improved least-squares migration through double-sweeping solver
Improved least-squares migration through double-sweeping solver
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DOI：
10.1190/geo2021-0628.1
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发表时间：
2023-05-01
期刊：
影响因子：
3.3
通讯作者：
Guddati, Murthy N.
中科院分区：
文献类型：
--
作者：
Eslaminia, Mehran;Elmeliegy, Abdelrahman M.;Guddati, Murthy N.
基于最近开发的近似波动方程求解器，我们开发了一种降低频域地震偏移计算成本的方法。这种方法将感兴趣的域划分为更小的子域，并使用顺序过程计算波场以确定向下和向上传播的波场 - 因此称为双扫描求解器。使用子域之间的界面条件的特殊近似可以使顺序过程成为可能。该方法作为近似求解器纳入最小二乘迁移框架中。相关的计算工作量与单向波动方程方法相当，然而，如数值示例所示，其精度和收敛行为与全波方程相当。
Based on a recently developed approximate wave-equation solver, we have developed a methodology to reduce the com-putational cost of seismic migration in the frequency domain. This approach divides the domain of interest into smaller sub -domains, and the wavefield is computed using a sequential process to determine the downward-and upward-propagating wavefields - hence called a double-sweeping solver. A se-quential process becomes possible using a special approxima-tion of the interface conditions between subdomains. This method is incorporated into the least-squares migration framework as an approximate solver. The associated compu-tational effort is comparable to one-way wave-equation ap-proaches, yet, as illustrated by the numerical examples, the accuracy and convergence behavior are comparable to that of the full-wave equation.