Seismic – At the Weyburn Field, multi-component 3-D surface seismic time-lapse surveys were conducted at intervals of approximately 12 months, starting prior to the commencement of CO2 injection in 2000, and repeated in 2001 and 2002. The resultant time-lapse images (primarily seismic amplitude changes) acquired at Weyburn clearly map the spread of CO2 over time within the reservoir, fulfilling a key objective set at the outset of the project. However, a detailed, quantitative estimate of CO2 volumes from the seismic surveys remains elusive due to the multi-phase composition (brine, oil, and CO2) and pressure-dependent behavior of the reservoir fluids (Monea et al., 2008). In 2004, Sandia National Laboratory (SNL) and LANL conducted an extensive 3-D.
