Multiscale Fracturing in Medium- to Low-Rank Coals and Its Implications on Coalbed Methane Production in the Baode Area, Eastern Ordos Basin, China

Figure 3

Fractures developed in underground coal seams in different locations. The lower figure is a schematic, where white areas represent coal falling out from the bottom, red lines represent exogenous joints, gray-yellow areas represent mudstone gangue, and other colors represent coal stratification of different macroscopic coal types.