Improved least-squares migration through double-sweeping solver
| Autor: | Mehran Eslaminia, Abdelrahman M. Elmeliegy, Murthy N. Guddati |
|---|---|
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | GEOPHYSICS. 88:S131-S141 |
| ISSN: | 1942-2156 0016-8033 |
| DOI: | 10.1190/geo2021-0628.1 |
| Popis: | Based on a recently developed approximate wave-equation solver, we have developed a methodology to reduce the computational cost of seismic migration in the frequency domain. This approach divides the domain of interest into smaller subdomains, and the wavefield is computed using a sequential process to determine the downward- and upward-propagating wavefields — hence called a double-sweeping solver. A sequential process becomes possible using a special approximation of the interface conditions between subdomains. This method is incorporated into the least-squares migration framework as an approximate solver. The associated computational effort is comparable to one-way wave-equation approaches, yet, as illustrated by the numerical examples, the accuracy and convergence behavior are comparable to that of the full-wave equation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|