PETROPHYSICAL RESERVOIR MODEL OF THE BEAVER LODGE OIL FIELD WILLIAMS COUNTY, NORTH DAKOTA

Permanent storage of carbon dioxide (CO₂) in mature petroleum reservoirs and saline aquifers has been an identified as a potential method to reduce the environmental impacts associated with fossil fuel energy use. The Beaver Lodge oil field is a multiple-pay field located along the N-S trending Nesson anticline in Williams County, North Dakota with the potential of being a sink for CO₂. The structural trap and the shallowing upward carbonate and evaporite sequences of the Duperow Formation in the Beaver Lodge has been identified as a potential target to sequester significant amounts of CO₂. Combining CO₂ sequestration and CO₂-based enhanced oil recovery (EOR) in mature oil and gas reservoirs allows more hydrocarbon to be retrieved than previously possible, which also offsets part or all the sequestration cost. In order to determine the sequestration and EOR potential of the reservoir, an accurate reservoir model was required. The Beaver Lodge oil field was petrophysically modeled from well data to determine the reservoir characteristics and rock and fluid properties. The petrophysical models were then used to populate the reservoir model with the determined properties through geostatistical methods. Modeling was completed using the industry software Interactive Petrophysics and Petrel. The reservoir model was run to demonstrate production history matching and the potential reservoir response to proposed CO₂ injection.