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Table 1. Properties of producing U.S. shale gas basins (modified from Faraj et al., 2004).

Characteristic*
Barnett
Ohio and Equivalents
Antrim
New Albany
Lewis
Basin
Fort Worth
Appalachian
Michigan
Illinois
San Juan
Age
Mississippian
Late Devonian
Late Devonian
Late Devonian
Late Cretaceous
Location
TX
OH, KY, NY, PA, WV, VA
MI, IN, OH
IL, IN, KY
CO, NM
Depth Feet
6500-8500
2000-5000
600-2000
500-2000
3000-6000
Thickness Feet
200-300
300-2000
160
180
1000-1500
Net Thickness
50-100
30-100
70-120
20-120
200-300
Bottom Hole Temp °F
200
100
75
80-105
130-170
Pressure Gradient psi/ft.
0.43-0.44
0.15-0.4
0.35
0.43
0.2-0.25
Maturity (Ro. %)
1.1-1.4
1-1.3
0.4-1.6
0.6-1.3
1.6-1.88
TC wt. %
1-4.5
0.5-23
0.5-20
1-20
0.5-2.5
Total Porosity
1-6
2-5
2-10
5-15
.5-5
Sw
0.1-0.8
0.1-0.8
0.1-0.8
0.1-0.8
0.1-0.8
Gas Content scf/ton
300-350
60-100
40-100
40-80
15-45
Adsorbed Gas % of total
20
50
70
40-60
13-40
Well Costs 1000s $
450-600
200-300
180-250
125-150
250-300
Completion Costs 1000s $
100-150
25-50
25-50
25
100-300
Gas Prod. Mcf/day per well
100-1000
30-500
40-500
Oct-50
100-200
Water Prod. Bwpd
0
0
20-100
5-500
0
Well Spacing Acres
80-160
40-160
40-160
80
80-320
Recovery Factor
8-15
10-20
20-60
10-20
5-15
GIP BCF/Section
30-40
5-10
8-16
7-10
90
Resources TCF
26.2**
225-250
12-20
2-20
100

GIP - Gas In Price

matrix permeability for all shales <<1 md

*note all values are generalized, locally values may be higher or lower.

**Pollastro et al. 2004