Abstract
Exploration targets in structurally complicated areas with strong lateral variations in velocity require interpretation of seismic data imaged in depth. In areas where conventional processing which includes dip-moveout correction yields CMP-stacked data with good signal strength and continuity, 3-D stack depth migration offers an attractive solution to the imaging problem. Moreover, migration itself can be used for building and refining velocity-depth models layer-by-layer starting from the surface. In such a procedure, complete model is constructed by combining interval velocity information with reflector geometries obtained from interpretation of depth migrated seismic horizons. It follows that quality of final migrated result depends strongly on the fidelity of migration algorithm and its implementation. In particular, positioning accuracy, dip response and amplitude preservation characteristics of migration are of importance in addition to issues of turnaround time.
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