Coal Facies and Its Effects on Pore Characteristics of the Late Permian Longtan Coal, Western Guizhou, China

Table 1

Average porosity, surface area, permeability, median pore diameter, and average pore diameter of various coal facies based on mercury intrusion porosimetry experiment data.

Parameters	MFPS; (YV-1 well)	MFPS; (PQ-1 well)	DFPS; (PQ-1 well)	SCPS; (PQ-1 well)
Porosity (%)	3.44	4.14	3.84	3.38
Total pore area (m^2/g)	4.81	5.92	5.49	5.36
Permeability (mD)	1.33	1.50	1.06	0.75
Median pore diameter (nm)	8.18	8.16	8.07	8.10
Average pore diameter (nm)	20.20	18.88	18.13	16.35

Note: MFPS: moist forest peat swamp facies; SCPS: shallow-water covered forest peat swamp facies; and DFPS: dry forest peat swamp facies.