Petroleum Geology of the Parshall Field Area, Mountrail County, North Dakota Total Middle Bakken Isopach Map The Middle Bakken thins to the east and thickens to the west. The middle member gets up to 70 ft thick west of Parshall Field and the maximum thickness in Parshall Field is approximately 40 ft. Facies E and F Isopach Map Facies E and F combined get up to 20 ft thick to the north and west of Parshall Field. Within Parshall Field thicknesses range from approximately 10 - 15 ft thick. Core porosity ranges from 3 - 11% and core permeability ranges from 0.0001mD - 0.62mD. Facies D Isopach Map Facies D is the highest energy facies in the area and gets up to approximately 20 ft thick to the north and west of Parshall Field. Within Parshall Field, this facies is mostly absent with some sporadic intervals of up to 10 ft thick. Core porosity ranges from 1 - 11% and core permeability ranges from 0.0003mD - 0.03mD. Facies C Isopach Map Facies C is the thickest to the west of the Parshall Field at approximately 30 ft. This facies is present on the western side of Parshall Field but pinches out on the eastern part of the field. Core porosity ranges from 2 - 10% and core permeability ranges from 0.0001mD - 0.05mD. Facies A and B Isopach Map Facies B is the thickest facies in the area. It is up to 30 ft thick west of Parshall Field and approximately 10 - 15 ft thick in Parshall Field. Core porosity ranges from 2 - 10% and core permeability ranges from 0.0001mD - 0.738mD. Facies A is ranges from 1 - 4 ft thick but is mostly absent in the Parshall Field. Core porosity ranges from 2 - 6% and core permeability ranges from 0.0001mD - 0.30mD. Facies C Deadwood Canyon Ranch 43-28H Facies F Deadwood Canyon Ranch 43-28H 10078 ft 10077 ft Facies E Deadwood Canyon Ranch 43-28H 10080 ft 10112.7 ft Facies D Deadwood Canyon Ranch 43-28H 10085.5 ft 10094.7 ft Facies B Deadwood Canyon Ranch 43-28H Facies A Deadwood Canyon Ranch 43-28H 10121 ft 10146 ft E-W Cross section through the Parshall Field Area (location of section is on isopach maps). Datum is the top of the Upper Bakken. This cross section demonstrates the absence of Facies D in the Parshall Field as well as the pinching out of Facies C. Eventually Facies B also pinches out as the basin edge is approached. N-S Cross section through the Parshall Field area (location of section is on isopach maps). Datum is the Upper Bakken. This cross section from north to south shows the lack of a consistent Facies D and even Facies C in the area. These two facies appear to be mainly confined to middle Bakken paleolow areas. N S E W