The Devonian-Mississippian Bakken formation in SW Saskatchewan is informally divided into three members. The Upper and Lower Bakken members consist of thin, black, radioactive shales indicative of anoxic depositional environments. Pre-Cretaceous erosion may have removed the Upper Bakken in some locales. The Middle Bakken member, which is the reservoir facies of the Bakken Formation is comprised of interbedded siltstones, sandstones and oolites. The Middle Bakken member is interpreted to be deposited in a shallow water, mid to lower shore face environment. This map represents Mid-Bakken oil pools and units in relation to the RCEL asset lands Viking wells have been removed. In the vicinity of the RCEL acreage the tripartite division of the Bakken members is clearly demonstrated by the well 101/03-34-030-23W4.
Core analysis of the Middle Bakken (101/03-34-030-23W4) displays exceptional reservoir properties with porosities up to 35% and permeabilities in the range of 900-2000 mD. The maps below show cumulative Middle Bakken oil production and the location of the relevant Bakken log and core. a Middle Bakken Net pay map utilizing a cut-off of 10 ohms and 30% porosity. Internal RCEL volumetric reserve calculation based on this map indicates the Mid Bakken contains 27.0 million barrels of oil in place on the RCEL lands and adjoining acreage. Utilizing a primary recovery factor of 8% based on offsetting Mid-Bakken oil pools indicates a primary recoverable reserve of 2.2 MMBO. To date the Mid-Bakken has produced 96,300 BO leaving a remaining recoverable reserve of 2.1 MMBO. Infill drilling and EOR, which is shown to be effective in the area, would be similarly be expected to increase Bakken incremental oil recovery significantly.
The Middle Bakken Member has been successfully waterflooded in numerous pools and units in SW Saskatchewan. The Hoosier East Bakken pool lies 20 miles east of the RCEL lands and provides a strong analogy for EOR potential. The Hoosier East Oil Pool illustrates a typical Middle Bakken waterflood response that could be expected on the RCEL acreage. The East Hoosier pool contains 6 Middle Bakken oil wells supported by 4 water injectors. 131/01-11-031-26W3/00 illustrates the Bakken Formation stratigraphy in this pool and its resemblance to the RCEL asset wells. The current injector in 141/15-02-31-26W3 commenced water injection in November 2011. Response can be seen in 131/01-11-031-26W3 in February 2012 with a doubling of daily oil production rate and decrease in GOR. Comparable results are seen in numerous injection schemes in the Middle Bakken Sand throughout SW Saskatchewan.