Rapid Image-Ray Inverse Data Mapping without Using an Interval Velocity Model

E-17 RAPID IMAGE-RAY INVERSE DATA MAPPING WITHOUT USING AN INTERVAL VELOCITY MODEL ALEXANDER DRUZHININ Summary An image-ray inverse data mapping approach that tends to relax conventional assumptions on the direct use of an a priori interval velocity model is presented. The objective is the rapid construction of the initial model that can be used as a starting point for an iterative prestack depth migration (PreSDM) in structurally complex situations. A data-driven scheme estimates common reflecting element (CRE) attributes around image-ray traveltimes interpreted in zero-offset (ZO) sections. This scheme propagates ZO data along image-ray trajectories recursively layer-by-layer. The CRE stacking procedure