ABSTRACT: Reverse Time Migration Using CRS Shot Gathers

The Common-Reflection-Surface (CRS) technique was previously used for an enhancement of seismic prestack data, providing so-called CRS gathers with regularized common mid-point CMP and offset coverage, and with a strong noise suppression. These CRS gathers considerably improved the depth image in Kirchhoff prestack depth migration (PreSDM), but were not suited for shot-based PreSDM algorithms. Now geometry-preserving CRS shot gathers are available that can significantly increase the quality of shot based depth migration algorithms like one-way wave equation and reverse time migration (RTM). These state-of-the-art migration techniques will benefit from the strong signal-to-noise ratio of CRS shot gathers. The reverse time migrated shot gathers in offset and angle domain offer new possibilities for velocity analysis in complex geologic structures. Caballero, A., R. Ballesteros, E. Schuenemann, E. Tessmer, and H. Salazar, 2011, Reverse time migration using CRS shot gathers: Gulf Coast Association of Geological Societies Transactions, v. 61, p. 713. 713 Copyright © 2012 Gulf Coast Association of Geological Societies