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Synergy between geology, petrophysics, and engineering in the development of the Kisbey Oil Field has led to significant economic benefits in all stages of field exploitation. Detailed integration of advanced petrophysical technology and geological analysis created an enhanced reservoir description which provided input to a synergistic reservoir simulation model. This model fed back into the development drilling strategy and provided a basis for production operations optimization. Data from innovative production techniques was fed back into the reservoir simulation model to create an overall production plan which has led to dramatically lower operating costs.

The Kisbey Oil Field is located in Township 8, Range 6 W2 in the Mississippian "buried hill" trend on the northwest flank of the Williston Basin in southeastern Saskatchewan, Canada. Trapping is caused by a major erosional valley on the Mississippian erosional surface truncating the reservoir units updip and on the flanks of the field. Production is obtained from the Mississippian Kisbey Sandstone with several wells providing additional production from the Mississippian Frobisher and Alida Beds.

Detailed core examination and Mineralog* analysis show the Kisbey to be a complex lithologic mixture. It consists of reservoir quality dolomitic sandstone interbedded with high porosity-low permeability sandy dolomite, both cemented to varying degrees with anhydrite. It is difficult, with conventional log analysis of the Kisbey interval, to determine lithology. In addition, conventional log analysis yields 60 to 80 percent water saturations for intervals producing with a negligible water cut.

Petrographic examination of the Kisbey sandstone reservoir reveals a two-porosity system consisting of intergranular porosity between sand grains and micro-intercrystalline porosity in the dolomite cement. Using this concept together with accurate cementation and saturation exponents determined from core analysis and Electromagnetic Propagation Tool (EPT)** log calculations, a detailed lithologic and pore geometry model for the Kisbey interval was constructed. Recently developed high resolution wireline log measurements processed with thin-bed definition techniques were interpreted using a multi-mineral log analysis program constrained by the lithologic model.

Data from this evaluation was integrated with extensive relative permeability, capillary pressure, and PVT analyses into field-scale reservoir simulations. An interactive approach was employed involving engineers, a geologist, and a petrophysidst to "fine tune" the model to actual field results. The reservoir model recognized a strong aquifer as the dominant depletion mechanism and identified a number of drilling opportunities.

The model also predicted that recovery is not rate sensitive, which led to individual well optimization. Full life forecasts for the field provided the basis for field consolidation and battery construction.

In summary, the integrated approach optimized field development by drilling fewer wells in better places, optimizing individual well production, and planning a production facility designed specifically to the long-term requirements of the field.

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