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:

St. Peter Sandstone, Illinois Basin

Comments on Geologic Parameters

12b Formation Pressure:

There currently is no published information regarding geopressure gradients or maps showing formation-pressure distribution. We used well-completion information from Bell and Kline (1952) to determine the relationship between depth and formation pressure. The data demonstrated a geopressure gradient of about 39.2 psi/100 ft. We used this gradient in combination with the depth to the top of the St. Peter Sandstone to generate a pressure-distribution map for the GIS.

12b Map:

 

12b Reference:

Bell, A. H., and Kline, V., 1952, Oil and gas development in Illinois during 1951: Illinois Geological Survey, Illinois Petroleum 67, 53 p.