The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China

Table 3

Air migration equation setting.

Air migration	Value	Injection borehole position	Value
Initial pressure (MPa)	0	Extraction borehole number	1, 3, 5,; 7, 9, 11
Injection pressure (MPa)	0.3, 0.6, 1
Borehole boundary	Free deformation	Air injection borehole number	2, 4, 6,; 8, 10
Initial displacement	0