Migration velocity analysis from locally coherent events in 2-D laterally heterogeneous media, PartⅡ: applications on synthetic and real data

摘要

We demonstrate a method for estimating 2-D velocity models from synthetic and real seismic reflection data in the framework of migration velocity analysis(MVA). No assumption is required on the reflector geometry or on the unknown background velocity field, provided that the data only contain primary reflections/diffractions. In the prestack depth-migrated volume, locations where The reflectivity exhibits local coherency are automatically Picked without interpretation in two panels: common im- Age gathers(CIGs)and common offset gathers(COGs). They are characterized by both their positions and two Slopes.