Abstract

Determination of the precise interval velocity field for subsurface imaging is a major challenge in pre-stack depth migration (PSDM). The ability to define an accurate interval velocity model and economically perform pre-stack imaging in depth provides the opportunity to more fully exploit the critical subsurface imaging. However, the PSDM method is more demanding of the data requirements than conventional time techniques to deliver the degree of velocity model accuracy required for optimal spatial positioning of target reflectors.