Pre-stack depth migration velocity analysis method via CRP-scan

摘要

CRP-scan (Common Reflection Point) is a method of 3D pre-stack depth migration velocity analysis based on layer-stripping. CRP gathers can be obtained from Kirchhoff depth migration via a scan of homothetic velocity perturbations. The picked new velocity perturbation and depth location from optimal alignment of reflections observed directly in CRP-scan gathers allow the production of an updatedvelocity model. This reliable, fast tool free from any assumption has been applied successfully to 3D Kirchhoff pre-stack depth migration processing for CB30 area of Shengli Oilfield.