Petroleum Geology of the Parshall Field Area, Mountrail County, North Dakota

Upper Bakken Shale Isopach Map

The Upper Bakken Shale is between 15 and20 ft thick in the Parshall Field area and thinsslightly to the north and east.

Lower Bakken Shale Isopach Map

The Lower Bakken Shale is up to 50 ft thickwest of Parshall Field. It is approximately 30 ftthick at Parshall Field and thins to the east.

Upper Bakken ShaleDeadwood CanyonRanch 43-28H

10077 ft

Lower Bakken ShaleDeadwood CanyonRanch 43-28H

10147 ft

10151.1 ft

Upper Bakken Shale TOC

Total organic carbon of the Upper BakkenShale at Parshall Field is approximately13 - 15% and increases to the west. TOCdata from Webster 1984 and Price 1984.

Lower Bakken Shale TOC

Total organic carbon of the Lower BakkenShale at Parshall Field is approximately11 - 12% and increases to the west. TOCdata from Webster 1984 and Price 1984.

Upper Bakken Shale PI andProduction

Contour lines show the production index of theUpper Bakken Shale and the red dots indicatedwells with any Bakken oil production.Production on the east side of Parshall Fieldtrends along the 0.09 PI contour.

Lower Bakken Shale PI andProduction

Contour lines show the production index of theLower Bakken Shale and the red dots indicatedwells with any Bakken oil production.Production on the east side of Parshall Fieldtrends along the 0.10 PI contour.

Deadwood Canyon Ranch 43-28H

References Cited

Blakey, 2007 . (Last accessed on October 1, 2009).

Canter, L., O. Skinner, and M. D. Sonnenfeld, 2009, Facies and Mechanical Stratigraphy of theMiddle Bakken, Mountrail County, North Dakota, Abstract, Rocky Mountain Section of SEPMLuncheon, January 27, 2009.

LeFever, J., 2008, What's Happening at Parshall, North Dakota: DMR Newsletter, v. 35, No. 1, p.1-2.

Meissner, F. F., 1978, Petroleum geology of the Bakken Formation, Williston basin, North Dakotaand Montana, D. Rehrig, ed., The economic geology of the Williston basin: Proceedings ofthe Montana Geological Society, 24th Annual Conference, p. 207–227.

Price, L. C., T. Ging, T.Daws, A. Love, M. Pawlewicz, and D. Anders, 1984, Organicmetamorphism in the Mississippian - Devonian Bakken shale, North Dakota portion of theWilliston Basin Woodward J., F. F. Meissner, J. L. Clayton, eds., Hydrocarbon Source Rocksof the Greater Rocky Mountain Region, Denver, Colorado, Rocky Mountain Association ofGeologists, p. 83-134.

Schmoker, J. W., and T. C. Hester, 1990, Formation Resistivity as an Indicator of Oil Generation –Bakken Formation of North Dakota and Woodford Shale of Oklahoma: The Log Analyst,January-February, 1990, p. 1-9.

Smith, M. G., and R. M. Bustin, 1996, Lithofacies and paleoenvironments of the Upper Devonianand Lower Mississippian Bakken Formation, Williston Basin: Bulletin of Canadian PetroleumGeology, v.44, p. 495-507.

Webster, R. L., 1984, Petroleum source rocks and stratigraphy of the Bakken Formation in NorthDakota Woodward J., F. F. Meissner, J. L. Clayton, eds., Hydrocarbon source rocks of thegreater Rocky Mountain region, Rocky Mountain Association of Geologists, p. 57 - 82.

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Conclusions

1. There is a good correlation between the core faciesidentified and their corresponding log characteristics.

2. Facies E, D, and C are the produced intervals inthe middle Bakken member. Within Parshall Field,Facies D is mostly absent and Facies C is pinchingout leaving just Facies E for the targeted reservoirmoving to the east.

3. There appears to be a thermal maturity barrier tothe east side of Parshall Field. Production indexvalues are right at the top of the oil window.

4. Production appears to be solely related to reservoirrocks with a mature source rock present.

There is little evidence for lateral migrationWith such low porosity and low permeability,

fractures play a role in production and can be seen inmore detail at Steve Sonnenberg’s poster.

5. Well log analysis suggest that a variable m and ngets a better water saturation model and a variableKPHIEXP gets a better permeability model.

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TheUpper and Lower Bakken Shales are extremely richsource rocks and do not need much to produce oil.