Investigating Sequestration Potential of Carbonate Rocks during Tertiary Recovery from a Billion Barrel Oil Field , Weyburn , Saskatchewan : the Geoscience Framework ( IEA Weyburn CO 2 Monitoring and Storage Project )
Introduction In Western Canada the application of CO2 injection for enhanced, ‘tertiary’ oil recovery is a relatively recent addition to the arsenal available to reservoir engineers. The first successful application of CO2 as a miscible fluid in Western Canada began in 1984 at Joffre Field, a Cretaceous marine siliciclastic reservoir in southern Alberta. A significant portion of the remaining proven conventional oil reserves in Western Canada, however, reside in large mature Paleozoic carbonate fields, such as the Mississippian Weyburn Field in SE Saskatchewan (Figure 1). In combination with economically dictated tertiary recovery schemes, these large fields could provide attractive geologic sites for future sequestration of greenhouse gases. An immediate challenge to geoscientists is to assess the ability of these geologic containers to store CO2 for geologically significant lengths of time.
Anhydrite Replacements of Gypsum (Satin-Spar) Veins in the Mississippian Caprocks of Southeastern Saskatchewan
Sheets of anhydrite, up to 5 cm thick, occur abundantly in southeastern Saskatchewan within dolomitized Mississippian carbonates where these are unconformably overlain by Watrous red beds. The sheets are interpreted as former gypsum veins that have lost structural water as a result of later burial. Replacement by anhydrite was accompanied by no loss of volume and the fibrous vein structure of the former gypsum is partially mimicked by the anhydrite.Gypsum veining is believed to have occurred as a result of the migration of calcium sulphate-rich brines through the Mississippian carbonates after the deposition of the Watrous red beds.
Teaching learning disability to undergraduate medical students
The education of doctors shapes their professional identity: who they are and how they practise. Where does the issue of learning disability fit in? What is it and of what factors should doctors in training be aware?

The training of medical students has been defined by the General Medical Council (