The CO2 occurrences in Devonian carbonates of southwestern Saskatchewan are suggested to represent a natural analogue for the Weybum injection site due to their similar basinal environment and geological framework. On the western flank of the Williston Basin, southwestern Saskatchewan, Canada, CO2 occurs in natural accumulations within Devonian carbonates and Cambrian silicielastics. Inert gases from some carbonate reservoirs contain greater than 80 per cent CO2 and have sustained flow rates up to 425, 000 m3/day. Early estimates of this resource suggested nearly two million tons of CO2 or about one billion m3 of recoverable gas are present in these rocks. These natural CO2 occurrences are found about 400 km west of the site of the IEA Weyburn CO2 Storage and Monitoring Project that is directed toward assessing the potential for safe geological storage of anthropogenic CO2 in Mississippian carbonates. The Devonian strata containing natural CO2 accumulations in southwestern Saskatchewan are geologically very similar to the Mississippian beds being injected with CO2 at the Weyburn Field.
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