Micropore Structure and Fractal Characteristics of Low-Permeability Coal Seams

Table 1

Permeability of different coal samples.

Coal sample	Porosity (%)	Permeability (md)	Appraise	Classify
B-1	8.2	3.75	Permeability range	Ultralow-permeability reservoir
B-2	7.7	9.77
B-3	7.0	0.29
B-4	5.0	0.43
B-5	6.3	5.32
B-6	6.8	13.2	Poor permeability	Low-permeability reservoir