Time-Lapse Repeatablity in 3C-3D Dataset from Weyburn CO2 Sequestration Project

Summary The success of time-lapse seismic monitoring relies on repeatability of dataset parameters. In this study, the consistency of source and receiver coordinates was measured and compared with baseline in 3C-3D seismic dataset used in IEA Weyburn CO2 Sequestration and Monitoring Project. We examine the repeatability of source, receiver and stacked data and suggest how these measurements can be used to support calibrated data processing. The results suggest that the 2002 vintage of the dataset is can be considered repeatable with the 1999 baseline, whereas the 2001 monitor is difficult to calibrate because of the differences in shot patterns. New, pre-stack calibration approaches are required in order to achieve consistent repeatability that could be sufficient for deriving calibrated AVO attributes.