General Setting
Information Search and Selection

Com ments

on

Geo logic

Para meters

1 Depth:

2 Permeability/Hydraulic Conductivity:

3 Formation Thickness:
4 Net Sand Thickness:
5 Percent Shale:
6 Continuity:
7 Top Seal Thickness:
8 Continuity of top seal:
9 Hydrocarbon Production:
10 Fluid Residence Time:
11 Flow Direction Elevation:

12

CO2 Solu bility Brine

 12a Temperature:
12b Pressure:
12c Salinity:
13 Rock/Water Reaction:
14 Porosity:
15 Water Chemistry:
16 Rock Mineralogy:

Fox Hills — Lower Hell Creek, Powder River Basin

Comments on Geologic Parameters

4 Net Sand Thickness:

The net sandstone thickness of the Fox Hills Sandstone is calculated from formation isopach and percent-sand data from Lewis and Hotchkiss (1981). Percent sand values of the Fox Hills Sandstone are more than 70 percent in Montana and decrease to 40 to 50 percent in the south part of the basin.

4 Map:

4 Reference:

Lewis, B. D., and Hotchkiss, W. R., 1981, Thickness, percent sand, and configuration of shallow hydrogeologic units in the Powder River Basin, Montana and Wyoming: U. S. Geological Survey, Miscellaneous Investigations Series, Map I-1317, 6 sheets.