The area of interest, T. 66-74, R. 1-9W5, incorporates the Mitsue Field, a major stratigraphic trap, as well as an under-explored fairway west of Mitsue. Traps in the area consist of structural drape over paleo-highs and younger reactivated (?) subtle horst-graben structures. Hydrodynamic conditions are suspected to exist in this portion of the basin, hence it is important to determine the affects of flow on oil entrapment and to evaluate the possible redistribution of oil within the reservoir. The objectives of this paper are to establish the direction and magnitude of the hydraulic gradient within the Gilwood Formation, determine the significance of the regional potentiometric surface variations, calculate oil entrapment potential through impelling force vector analysis, and to predict dip of oil/water interface under hydrodynamic conditions.