Study on the Coalbed Methane Development under High In Situ Stress, Large Buried Depth, and Low Permeability Reservoir in the Libi Block, Qinshui Basin, China
Table 1
Mechanical parameters of the coal seam in the southern Qinshui basin, alongside with its roof and floor [28].
Stratum
Compressive strength (MPa)
Tensile strength (MPa)
Elastic modulus (GPa)
Poisson’s ratio
Rock softening coefficient
Roof of the No. 3 coal seam: mudstone and sandy mudstone
31.45–39.28
1.39–1.78
0.28–3.25
0.26–0.31
0.33–0.63
36.10
1.61
2.29
0.28
0.48
No.3 coal seam
2.51–20.91
0.09–0.93
0.21–1.63
0.28–0.33
0.22–0.58
11.10
0.48
0.91
0.31
0.46
Floor of the No.3 coal seam: argillaceous siltstone
