CRS-Stack-Based Seismic Imaging for Land Data - A Case Study from North Brazil

As recent case studies demonstrated, the Common-Reflection-Surface (CRS) stack produces reliable stack sections with high resolution and superior signal-to-noise ratio compared to conventional stacking methods. Particularly for land data, the <br>increased computational expense required by the generalized high-density velocity analysis preceding the CRS stacking process often proves to be worthwhile. <br>In order to define optimal spatial stacking operators, the CRS stack extracts for every sample of the zero-offset section an entire set of physically interpretable stacking parameters. These so-called kinematic wavefield attributes, can be applied to solve various dynamic and kinematic stacking, modeling, and inversion problems. By this means, a very flexible CRS-stack-based seismic reflection imaging workflow can be established. The main steps of this workflow are, besides the CRS stack itself, residual static correction,determination of a macrovelocity model via tomographic inversion, and limited aperture Kirchhoff migration. The presented extension of the CRS-stack-based imaging workflow supports arbitrary top-surface topography. Both CRS stack and also CRS-stack-based residual static correction are applied to the original prestack data without the need of any elevation statics. Finally, a redatuming procedure relates the CRS-stacked zero-offset section, the kinematic wavefield attribute sections, and the quality control sections to a chosen planar measurement level.