Coalbed Methane Industry Development Framework and Its Limiting Factors in China

Table 2

Design of CBM development modes.

Area categories	Buried depth (m)	Stress	Special geological conditions	Suggested development mode
In situ coal seams	Shallow	Low in situ stress	Weakly deformed coal; water-bearing coal	Depressurization via dewatering
			Strongly deformed coal; water-free coal	Depressurization via stress release
	Deep	High in situ stress	Low permeability and high effective stress	Depressurization via stress release
Coal mining areas	<1500	Reservoir pressure release through mining	Continuous coal seams with large thickness	Coal and CBM comining