Presentation on theme: "Dan Kohlruss, Erik Nickel and Jeff Coolican"— Presentation transcript:
1 The Saskatchewan Bakken: Unconventional, Conventional or All of the Above Dan Kohlruss, Erik Nickel and Jeff CoolicanSaskatchewan Geological Survey and PTRC
2 Why the Bakken?Study AreaStratigraphy and SedimentologyReservoir Differences : Conventional vs “Unconventional”Mapping and Depositional ModelTrapping modelsConclusions
3 2500 WellsThis slide illustrates the explosive growth in Bakken production from Southeast Sask over the last five years.As of September 11, 2009, there were 1,506 wells capable of producing Bakken oil in southeast Saskatchewan, of which 1,429 were drilled sinceJanuary 1, 2004.Bakken oil production in southeast Saskatchewan has increased from 600 barrels per day in January 2004 to a peak of just over 58,000 barrels per day in March 2009.The recent drop in Bakken production is certainly due to the economic downturn as producers wait for a rebound in stable prices prior to resuming their Bakken development activities.3
4 Bakken in SE SaskThe contribution of the Bakken production to the stream coming out of SE Sask is becoming quite significant, forming close to one-third of total output from the region compared to relatively nothing not that long ago.
5 Bakken in SE SaskThe Bakken Formation can be found in a broad region within a geological feature known as the Williston Basin.This basin extends over 200,000 square miles and lies beneath most of North Dakota and stretches to South Dakota, Montana, southeast Saskatchewan and southwest Manitoba.At least 25% of the basin lies beneath southeast Saskatchewan.The Encyclopedia of Saskatchewan at
6 Late Devonian (Famenian) Paleogeography ≈360 Ma From Blakey, NAU Geology 2006Study AreaLate Devonian (Famenian) Paleogeography≈360 MaOld Red SandstoneContinentAntler OrogenyProphet TroughEquatorSGAAntler ForelandBasinSwiftcurrentPlatformWillistonBasinAppalachian ForelandBasin30 s
7 Early Mississippian Paleogeography Old Red SandstoneContinentAntler OrogenyProphet TroughSGAAntler ForelandBasinWillistonBasinAppalachian ForelandBasinFrom Blakey, NAU Geology 2006
10 Mississippian Three Forks Group Bakken Fm This sequence lies immediately beneath the Mississippian limestone and dolomites that have been the dominant producing zones of the Williston Basin for over fifty years.Development of shallower Mississippian and Jurassic formations of the region has taken place due to greater producibility and less drilling required to access the reserves. This activity has resulted in the development of such well-known pools as Weyburn, Midale and Steelman to name a few.
13 Higher porosity in general more consistent Core AnalysisApprox 105 analyzed coreOver 1000 total data pointsUnit BHigher porosity in generalmore consistentDirect correlation between porosity and permeabilityConventional trapsUnit Aconsiderably lower porosity and permeabilityMore highly variableMany data points on lower limits of detectionUnconventionalNickel et al 2011
15 Unit B IsopachModified from Kohlruss and Nickel 2009
16 Bakken Depositional Model: Prograding Delta: Forced or Normal Regression?1.) Unit A deposited in a prograding, regressive setting2.) Continued regression and erosion of Unit ‘A’ proximal prodelta deposits, and deposition of the unit ‘B’ delta-front sediments.3.) Unit C deposited in a transgressive setting
17 From Kohlruss and Nickel 2009 (modified after Plint 1988)
18 Hydrogeological Implications and Trapping Modified from Khan and Rostron, 2002
19 Viewfield Trapping Model Modified after Kohlruss and Nickel 2009
37 Dome et al HummingbirdW22260.4mImperial ConstanceW22054.9m“Flaser Bedded Facies”
38 Imperial ConstanceW2Dull yellow fluorescenceImmediate green cut
39 Bakken Future Activity Potential Legend:Crown LeasesFreehold (private) RightsBakken WellsOther Oil Wells?This map shows the availability of oil and gas rights in SE Sask. The white areas have rights available.39
40 12m OCM Constance area 341m G+OCM Land availability OC in Core 6m ocm Crown Land DisposedFree Hold12m OCMConstance areaLand availability341m G+OCMOC in Core6m ocm
41 Bakken Friendly Royalty Regime Bakken horizontal wells qualify for a very favorable Royalty Incentive VolumeFor the first 40,000 to 100,000 barrels produced, the royalty rate is 2.5% or less!
42 ConclusionsBakken drilling outside of Viewfield but currently widespreadViewfield is a combination of a stratigraphic and permeability trap aided by a strong hydrogeological component.Outside of Viewfield, structure plays an important roleCombination of facies pinch-out and possibly associated heat flow anomaly at Pinto/Bienfait?Salt tectonics at Hummingbird/Roncott/ConstanceThe future of the Bakken play is likely in structural and Stratigraphic traps like seen in Hummingbird pool and Pinto-Bienfait area
43 My colleagues at the Saskatchewan Geological Survey ACKNOWLEDGEMENTSErik NickelJeff CoolicanKim KreisMy colleagues at the Saskatchewan Geological Survey