A Simulation Study of Simultaneous Acid Gas EOR and CO2 Storage at Apaches Zama F Pool
The Plains CO2 Reduction Partnership, led by the Energy & Environmental Research Center, is working with Apache Canada Ltd. to validate the stored volumes of CO2 in the F pool of the Zama oil field in northwestern Alberta, Canada. Beginning December 2006, acid gas (70% CO2 + 30% H2S), captured at a nearby gas-processing plant, has been injected for simultaneous enhanced oil recovery (EOR) and CO2 storage purposes. To aid in the monitoring, verification, and accounting program, a detailed static geologic model of this heterogeneous pinnacle reef carbonate reservoir was constructed. A combination of object modeling and multiple-point statistics workflow was used for spatial distribution of different properties extracted from available borehole image logs and other well log data. One of the equiprobable static realizations was chosen for performing history matching for model validation. The history-matching results were then used for further conditioning of a static geologic model that include better representation of underlying aquifer and internal reservoir microfacies. The history-matching results indicate a residual oil saturation ranging from 40% to 60% in regions with good permeability. These areas will be targeted while evaluating the future incremental oil recovery potential for this reservoir.The reef structure below the oilwater contact was also modeled to explore the possibility of additional storage capacity gain in the underlying aquifer. With over 700 pinnacle reef structures in the Zama subbasin, a careful selection of pinnacle structures similar to F Pool may provide significant storage capacity gain through water extraction.View/Download Document
Event/Meeting Information
Carbon Storage R&D Project Review Meeting
8/21/2012
Pittsburgh, PA