Parameter

Reservoir

Coal

Shale

n

Min

Ave

Max

n

Min

Ave

Max

n

Min

Ave

Max

Temperature, ˚C

130

36

42

47

Pressure gradient, kPa/m

279

6.5

8.2

9.5

Water saturation, %

90

99

99.9

Critical water saturation, %

55

60

65

Bottom hole pressure, kPa

200

Density, g/cc

354

1.4

35

2.2

Langmuir volume, cc/g

45

9.9

13.7

17.5

12

0.24

1.5

7.2

Langmuir pressure, MPa

45

3.8

5.7

7.6

12

1.3

6.2

11.4

Matrix permeability, md

3

1e−5

1e−3

0.01

1e−7

1e−5

1e−3

Diffusion, cm²/s

5e−4

0.05

0.5

8e−5

8e−3

0.08

Matrix porosity, %

1e-4

1e-4

Effective fracture spacing, m

1

0.5

0.01

5

10

15

Max horiz fracture perm, md

110

0.5

3.8

31

1e−4

1e−3

0.01

Min horiz fracture perm, md

=k_max/3

=k_max

Vert fracture perm, md

=k_max/3

=k_max/10

Fracture porosity, %

6e−3

0.01

0.03

5e−5

1e−4

2e−4

Poisson’s ratio

31

0.25

0.36

0.47

Young’s modulus, GPa

37

0.5

2.3

4.6

Max strain at infinite P., MPa

3

0.42

1

1.6

Half-strain pressure, MPa

3

2.9

5.2

7.4