k o grades of the white bear member of the prairie
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R90WR95W R94W R89WR91W R88WR93W R92W
R90WR91W R87WR92WR94WR95W R89W R88WR93W
T158N
T158NT160NT1
60N
T159N
T159NT162N
T161N
T162N
T161NT164NT1
64N
T163N
T163N
Columbus
Lignite
Portal
Flaxton
Bowbells
Powers Lake
Kenmare
9.9 / 11.0
12.2 / 18.011.4 / 13.0
8.0 / 18.5
6.6 / 10.5
12.6 / 3.0
7.3 / 16.5
3.8 / 14.0
16.7 / 5.5
11.5 / 12.0
5.2 / 4.0
12.2 / 13.5
9.3 / 10.0
15.1 / 11.5
9.8 / 17.5
11.3 / 13.0
10.1 / 13.5
14.0 / 14.0
12.2 / 4.5
19.5 / 8.0
13.3 / 8.5
12.8 / 10.5
10.7 / 16.0
14.0 / 11.58.7 / 2.0
14.4 / 14.0
7.2 / 4.0
12.6 / 3.0
10.6 / 11.0
13.1 / 15.0
9.4 / 12.0
9.4 / 17.0
8.2 / 13.0
8.6 / 18.0
6.8 / 10.5
15.8 / 10.5
11.6 / 13.5
9.5 / 12.5
13.4 / 12.5
£¤52
£¤52
£¤52
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Burke County
Mountrail County
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Ward County
Divide CountyWilliams County
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Mountrail CountyWard County
North Dakota Geologica l SurveyGeologica l Investiga tion No 215 - Sheet 5 of 6 K2O Grades of the White Bear Member of the Prairie Formation
Cartogra phic Com pila tion: Navin T ha pa
Kenmare 100K Sheet, North Dakota
Edward C. Murphy, State GeologistLynn D. H elm s, Director Dept. of Minera l Resources
Ned W. Kruger2019
LegendThickness (ft)
0
1-3
4-6
7-9
10-12
13-15
16-18
19-21
Crain, E. R., 2014, Crain’s petrophysica l ha ndbook;U RL<http://spec2000.net/17-specpotash.htm >, accessed 14 Ja nuary 2014.Crain, E.R., and Anderson, W .B., 1966, Q ua ntitative log eva lua tion of theP ra irie Eva porite form a tion in Saskatchewa n: Journa l of Ca na dia n P etroleumT echnology, vol. 5, p. 145-152.Kruger, N.W ., 2014, T he Potash Mem bers of the Pra irie Form ation in NorthDa kota: North Da kota Geologica l Survey, Report of Investiga tion no. 113, 39p.Nelson, P.H ., 2007, Eva lua tion of potash gra de with ga m m a-ray logs: U .S.Geologica l Survey, O pen File Report 2007-1292, 14 p.
References:
Kenmare Quadrangle, North Dakota
-102°0'0"
-102°0'0"
-103°0'0"
-103°0'0"49°0'0" 49°0'0"
48°30'0" 48°30'0"
£¤2 Federa l H ighwaySta te H ighw ayUV50
CityOther Features
Symbols
Avg K2O % / Thickness (feet)!10.7/16.0
Well Control=
µ0 1 2 3 4
Miles
0 1 2 3 4Kilometers
Merca tor Projection Sta ndard P ara llel 48°30'0"N
North Am erica n 1983 Datum Centra l Meridia n 102°30'0"W
Sca le 1:100,000
T his series of m a ps of the Kenm are 100K Sheet was based on public data from 74 wells gathered by the North Dakota Industria l Com m ission – Departm ent of Minera l Resources, O il & Gas Division. T he W hite Bear Mem ber was identified on the geophysica l logs of 64 wells. Isopa ch contours were generated via PET RA (ver. 3.9.13) geologica l software. T he contour lines were com puter-generated based on well-control data only, with m inim a l a djustm ents m a de by the author. Areas with a geologica l a nom a ly m ay not be a ccurately portrayed. T he potash m em ber thickness for ea ch well, and the isopa ch contours generated from them , were m odified from Kruger (2014). All ca lcula tions were based on ga m m a -ray log m ea surem ents recorded in API units ta ken at six-inch increm ents throughout the potash-conta ining portion of the log. Corrections for borehole size and drilling m ud weight as well as rem ova l of the baseline ga m m a -ray signa l were m a de (Crain, 2014) (Crain & Anderson, 1966). T he corrected ga m m a -ray m easurem ents were converted into apparent potassium oxide (K2O ) concentrations. Avera ge K2O concentrations and potash m em ber thicknesses were obta ined using the gra de-thickness m ethod described in Nelson (2007), where bed thickness is equa l to the dista nce between the elevations at which the ga m m a -ray response declines to one-ha lf its m a xim um va lue. W hen a potash m em ber displayed m ultiple ga m m a -ray log pea ks separated by troughs representing sa lt or insolubles such as clay or anhydrite, thin potash interva ls at the upper or lower boundaries of the m em ber were not included in thickness or avera ge-potash-gra de ca lcula tions if the corrected ga m m a -ray m easurem ents were less tha n 100 API or separated by m ore tha n four feet from m a in body of the potash m em ber. T his occurred m ost frequently in deposits of the W hite Bear Mem ber, which m ay appear as one or two potash-rich beds underlying a thin potash-conta ining zone separated by an interbed of ha lite. T he volum e of potash from the W hite Bear Mem ber represented by this sheet is approxim a tely 11,800,000 acre feet.