Anisotropic wave propagation and zero-offset migration

摘要: In reflection seismology, migration may be defined as the transformation of apparent reflector positions to their true positions. practice this usually means that diffractions are collapsed and dip angles changed. When a medium is anisotropic, axes velocity symmetry tilted with respect horizontal, horizontal events migrate laterally well. The lateral reflections from layers was studied by constructing an anisotropic scale model representing in which bedding inclined surface. This situation classified one transverse isotropy axis symmetry. elastic parameters were recovered P- SH-wave transmission measurements carried out simulate walk-away VSP. Numerical modelling P-wave CMP gather above such indicated there would asymmetrical distribution points. zero-offset point displaced distance equal more than 20% depth, spread points 15% depth. NMO found function offset. A survey on model. data migrated algorithm applied wavefronts any shape. On resulting section, features moved depth back correct displacement beneath characteristics has significance for selection drill locations when encountered field.