Methods of analyzing velocity models include defining velocity anomaly models for a subsurface region under study. The velocity anomaly model is overlain on a seismic stack image to produce a hybrid velocity/amplitude model. Regions in which stack amplitudes are coincident with velocity anomalies may be interpreted as representing structures of interest. In an embodiment, clathrate deposits are identified using the hybrid model. In an embodiment, geobodies are identified, and velocity anomalies are constrained by the geobodies for revising migration models.
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