A Study of the Differences in the Gas Diffusion and Migration Characteristics of Soft and Hard Coal in High Gas Coal Seams

Figure 9

Microscanning results of the soft coal and hard coal. (a) No. 6 soft coal. (b) No. 6 hard coal. (c) No. 11 soft coal. (d) No. 11 hard coal.

(a)

(b)

(c)

(d)