Two-point Ray Tracing In 3-D Complex Media Using Triangular Surfaces: Application to Line-drawing Migration In 3-D

摘要: This expanded abstract presents and discusses a two-point (nonzero offset: source-receiver) ray tracing scheme for 3D complex seismic horizons discretized via triangles. The fast robust method, based on Fermat’s stationary principle, was first introduced by Guiziou (1991). two successive steps of the called atomic quadratic step, search with minimum (resp. maximum) traveltime. We have added third step improving accuracy without discretizing surfaces too small Resulting rays are validated carefully checking signature rays. global algorithm allows to compute reflected, refracted diffracted raypaths computational time if size unit triangles interfaces equals radius their associated Fresnel zone. Events been picked ECORS 2.5-D deep reflection stack volume (Marthelot et al., 1994) reorganized construct whose vertices events (time structures). Depth structures inferred from combination complementary approaches: migrating line-drawing structures) above following top down procedure. refining model deduced migration linedrawing forward modeling (calculating traveltimes) sections shotpoints.