Parsimonious 3D post‐stack Kirchhoff depth migration

摘要: Parsimonious post-stack migration is extended to three dimensions. By tracing single rays back along each incident wave direction (as determined by a local slant stack at the receivers), ray can be embedded in migration. This approach significantly reduces computer time and disk space needed because it not necessary build save image maps; 3D performed on workstation or personal rather than using supercomputer cluster. The location of reflector output defined zero-offset one-way traveltime (the condition); orientation as surface perpendicular raypath. The impulse response operator confined first Fresnel zone around estimated reflection point, which much smaller large isochronic traditional Kirchhoff depth Additional efficiency obtained applying an amplitude threshold reduce amount data migrated. Tests synthetic show that proposed implementation parsimonious least two orders magnitude faster migration, expense slightly degraded coherence. expected useful complement conventional migrations for fast initial imaging subsurface structures real-time near-offset sections during acquisition quality control.