Oil gravities in the Mannville section of west-central Saskatchewan range from 10 to 20 API. Uncertainties associated with the quality of oil likely encountered in a given play type, zone or geographic area have a significant economic impact on the plays. The regional area for mapping the water chemistry is in T. 35-55, R. 17-28W3, with the detailed oil chemistry study area in T. 37-47, R. 17-28W3. Numerous objectives of this study include: obtaining necessary oil analyses and water chemistry data, generate various crossplots of API gravity vs. viscosity, and integrate the hydrodynamics of the detailed area into the evaluations of the oil and water chemistry distribution.