Carbon dioxide sequestration in geological reservoirs is being evaluated internationally as a viable means of long-term CO 2 storage. The International Energy Agency Weyburn CO 2 Monitoring and Storage Project is designed to investigate the technical and economic feasibility of CO 2 storage in a partially depleted oil reservoir in conjunction with enhanced oil recovery operations. Two key elements of the project are (1) the establishment of a regional geoscience framework as a means for prediction of the long-term fate of injected CO 2 , and (2) development and application of geophysical/geochemical monitoring and verification methods to track the spread of CO 2 within the reservoir. To date, 1.90 billion m 3 of CO 2 have been injected into the reservoir, the effects of which are imaged by the various monitoring methods.

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