Investigation of the Velocities of Coals of Diverse Rank under Water- or Gas-Saturated Conditions for Application in Coalbed Methane Recovery

Table 3

Correlations between UPVp and UPVs for lignite, bituminite, and anthracite under water or gas saturation.

	Condition	Equation
Lignite	Water saturation		0.681
	Gas saturation		0.853
Bituminite	Water saturation		0.659
	Gas saturation		0.775
Anthracite	Water saturation		0.801
	Gas saturation		0.809