Velocity model influence in the position and geometry of a prospect area located in VSM Basin, by image ray tracing

Complex structures like subthrust show high risk during the definition of structural traps in time (PSTM) and depth (PSDM) low quality seismic images, so we can use the structural interpretation in time or depth domain to evaluate the velocity model influence in the position and geometry of a prospect area.Ecopetrol acquired a 3D PSTM seismic program in 2011, which has been reprocessed twice in order to improve PSTM image in fault shadow zones and clarify the structural setting to define the closure in a possible trap in the study area to reduce the exploratory risk.In addition, we did an exercise of 2D geophysical modeling using time-depth and depth-time conversion in one inline from the 3D survey.We use time to depth conversion based in image ray tracing, and a structural model interpreted in time (PSTM) and where we test three different velocity field scenarios to do a sensitivity analysis in the velocity model.Then, for depth to time conversion by image ray, we used two different structural models and with velocities derived from RTM seismic processing.Image ray establish a link between time and depth and allows a quick evaluation of structural geometry and pull-up effect presence simultaneously in both domains.