The objectives of this study are to develop a regional hydrodynamic framework for the Roseray-Vanguard zone, to determine the extent of vertical continuity between the Shaunavon-Roseray/Vanguard-Mannville units, and to cull data for production induced pressure drawdown and determine the potential extent of drawdown. In addition, the problem of source rock location, potential charge points and charge direction are addressed. Results from the study show that the oil is being trapped on the flank of the Sweetgrass Arch 150 km east and downdip of the structural crest. Stratigraphic isolation of the reservoir and hydrodynamic drive may be the dominant trapping mechanisms.