2D Versus Pseudo-3D Seismic Data Processing in the AVO Analysis - A Study Case

The seismic reflection dataset analyzed in this study was recorded along a crooked line with irregular spacing between receivers and sources, due to the field conditions (rough topography). As an effect, the midpoints were spread over an area with a width of about 900 m. The data processing was done for crooked and pseudo-3D geometries to correct the effect of data acquisition. The results were compared in order to choose the best processing approach. The Common-Reflection-Surface method was used to create regularized 2D and pseudo-3D CRS gathers, used later in the Amplitude-Versus-Offset analysis. The reflections seen on the time interval of interest are clearer on the pseudo-3D CRS gathers comparing with those seen on the 2D CRS gathers. The pseudo-3D pre-stack time migrated common-depth-point gathers show clearer reflections characterized by higher continuity and amplitude than those seen on the 2D pre-stack time migrated gathers. The offset interval covered by traces, with valuable information, sorted after the angles of incidence 0 – 25 degrees is greater on the pseudo-3D gathers comparing with that one seen on the 2D gathers.