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

Figure 6

Scatterplot and distribution of velocity data and the corresponding trends between UPVp and density for (a) lignite, (b) bituminite, and (c) anthracite at water/gas-saturated conditions.

(a)

(b)

(c)