Testing Hydrocarbon Saturation Models For Use in Original Oil-in-Place Estimation: South Dome of Oregon Basin Field, Park County, Wyoming
Michael J. Heymans, Douglas A. Steed, David E. Hamilton, Barbara A. Pavlov, 1992. "Testing Hydrocarbon Saturation Models For Use in Original Oil-in-Place Estimation: South Dome of Oregon Basin Field, Park County, Wyoming", Computer Modeling of Geologic Surfaces and Volumes, David E. Hamilton, Thomas A. Jones
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A computer mapping technique for improving the accuracy of original oil-in-place estimates for the Tensleep and Phosphoria formations in South Dome of Oregon basin field, Park County, Wyoming, is presented. Grids representing top and base structure, average porosity, net-to-gross ratio, and integrated average oil saturation from capillary pressure curves, are combined to create a grid of hydrocarbon pore thickness for each reservoir.
The average-oil-saturation model is created by correlating capillary pressure curves to mapped porosity. This model incorporates more information about the three-dimensional distribution of reservoir fluids than was used in methods applied previously. Because of this, it provides a more accurate representation of the fluids' areal distributions. Volumes resulting from use of this technique are compared with methods that use alternative average oil saturation modeling approaches: (1) a constant oil saturation, (2) a grid derived from average-oil-saturation at each well, (3) an average oil saturation grid from a single capillary pressure curve, and (4) a dry-oil production contact used in place of the free-energy surface. Maps show the steps in the process and allow comparison of the effects of the five oil saturation modeling methods.