The Weyburn Field in southeastern Saskatchewan, Canada (Figure 1) was discovered in 1954 and has been water-flooded since the 1960s. In October 2000, injection of CO2 for enhanced oil recovery was started by EnCana, concurrently with a multidisciplinary International Energy Agency Greenhouse Gas (IEA GHG) CO2 Monitoring and Storage Project (CO2MSP). In order to monitor CO2 injection, storage, and oil recovery, several vintages of 3D and 3D/3-C data were acquired, starting with a baseline survey in December 1999. These time-lapse data sets were used to evaluate the quality and safety of CO2 sequestration, and monitor the reservoir pressure front, water flooding, and bypassed oil (White et al., 2004).

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