Full-Scale Pore and Microfracture Characterization of Deep Coal Reservoirs: A Case Study of the Benxi Formation Coal in the Daning–Jixian Block, China

Table 2

Pore structure parameters of the coal samples.

Sample ID	Depth (m)	Formation	High-pressure MIP		LT-N2GA			LP-CO2GA
			PV (cm^3/g)	SSA (m^2/g)	PV (cm^3/g)	SSA (m^2/g)	DDFT (nm)	PV (cm^3/g)	SSA (m^2/g)	DDFT (nm)
DJ57-1	1884.28	Benxi Fm.	0.014	7.42	0.007	3.96	3.775	0.056	190.36	0.501
DJ57-2	1886.21	Benxi Fm.	0.018	10.09	0.004	2.46	1.22	0.042	143.64	0.501
DJ57-3	1887.32	Benxi Fm.	0.026	16.31	0.005	3.57	4.411	0.061	207.37	0.501

Notes: MIP = mercury intrusion porosimetry; LT-N₂GA = low-temperature N₂ adsorption; I = inertinite; LP-CO₂GA = low-pressure CO₂ adsorption; PV = pore volume; SSA = specific surface area; DDFT = average pore width according to the DFT model.