3D CRS processing: a better use of pre-stack data
Daniela Borrini, Antonio M. Cristini, P. Follino, Paolo Marchetti, Enrico Zamboni · 2005
3D Zero-Offset Common Reflection Surface Stack (3D ZO CRS) stacking technique has demonstrated, through the last few years, to improve the imaging quality with respect to the conventional NMO/DMO processing. It is a full data driven approach, particularly efficient and robust in case of poor S/N and low coverage data and it properly handles, in amplitude preserved way, cases characterized by lateral velocity variations and structural complexity. The 3D CRS technique, now implemented at industrial level, is becoming in ENI a widely applied processing step. In this paper we show the results for two medium-low fold datasets, characterized by different S/N ratio and geological framework. The improvements of the overall structural images obtained with a Post-Stack Time Migration of the 3D CRS stack when compared to 3D NMO/DMO + Post-Stack Time Migration (first case) or 3D Pre-Stack Time Migration (second case) are clearly visible in the results. Some insights regarding the reason of these improvements are addressed in the discussion.