The Map Migration workflow enables rapid map remigration of interpreted surfaces using a revised velocity model, which can come from being updated by reflection tomography or manually updated for scenario testing without incurring the expense and delay of remigrating the seismic traces on a Linux® cluster. This repositioning of the surfaces enables quick QC by seeing the effect on target surfaces before running a full migration.
- Quick quality control of velocity model updates by seeing the effect on target surfaces before running migration
- Scenario testing of multiple velocity models on target horizons
Map migration methods
- Ray tracing—full zero-offset ray-tracing remigration for an interpreted surface using a new velocity model and honoring the initial dip and azimuth of the original surface
- Vertical stretch—remigration of an interpreted surface using a new velocity model but without honoring the initial dip and azimuth of the surface; the surface is migrated to its new position by vertical rays, which is faster than by migrating with full zero-offset ray tracing.
Map migration process
- Residual map migration using a new velocity model
- Depth-to-time demigration using original velocity migration
- Time-to-depth remigration using updated velocity model
Map migration options
- Surface decimation of any number of location points to improve performance of the interactive map migration
- Use of optional smoothed velocity models for the original and updated models to determine ray tracing
- A tolerance factor to remove any section of the surface that is migrated further than a specified distance from its original position