Loading...
Please wait, while we are loading the content...
Similar Documents
An efficient 3D wave-equation pre-stack time migration for high-density and wide-azimuth data
| Content Provider | Oxford Academic |
|---|---|
| Author | Zhao, Shengtian Feng, Bo Tang, Xianggong Shang, Xinmin |
| Copyright Year | 2022 |
| Abstract | The sharp increase in data size of the high-density and wide-azimuth seismic acquisition makes seismic processing routines very challenging. To reduce the turn-around time of pre-stack time migration (PSTM) for large-scale field data (terra to petabyte size), we present an efficient wave-equation PSTM that is an approximate version of the double-square-root (DSR) migration for moderate lateral velocity variation. By converting the DSR dispersion relation into the vertical-time domain and ignoring an offset-dip term, a novel common-offset ray parameter wave-equation PSTM is developed. Meanwhile, the common-offset ray parameter data (i.e. offset plane waves) can be formed by applying the linear Radon transform to the common middle point CMP) gathers. To enhance the signal-to-noise ratio of the conventional Radon transform, we integrate the Radon transform result over azimuth, yielding azimuth-independent offset plane waves that are well suited to irregular sampling and uneven offset distribution. Furthermore, the split-step Fourier method is introduced to extrapolate the wavefield efficiently. Since the pre-stack migration of common-offset ray parameter data is migrated independently, the common image gathers (CIGs) can be generated naturally by sorting the migrated sections by ray parameters. A 3D high-density field data test demonstrates the efficiency and effectiveness of the proposed method, making it very promising for industrial-sized data processing. |
| Related Links | https://academic.oup.com/jge/article-pdf/19/4/955/45612893/gxac064.pdf |
| Ending Page | 963 |
| Starting Page | 955 |
| File Format | |
| ISSN | 17422132 |
| e-ISSN | 17422140 |
| DOI | 10.1093/jge/gxac064 |
| Journal | Journal of Geophysics and Engineering |
| Issue Number | 4 |
| Volume Number | 19 |
| Language | English |
| Publisher | Oxford Academic |
| Publisher Date | 2022-08-29 |
| Access Restriction | Open |
| Subject Keyword | Earth Sciences and Geography Geophysics Science and Mathematics High-density and Wide-azimuth Acquisition Large-scale Data Offset Plane-wave Decomposition Wave-equation Pre-stack Time Migration Common Image Gathers |
| Content Type | Text |
| Resource Type | Article |
| Subject | Industrial and Manufacturing Engineering Geology Geophysics Management, Monitoring, Policy and Law |
