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 1

Properties of the Benxi Formation coal in the Daning–Jixian block.

Sample ID	Depth (m)	Formation	(%)	He porosity (%)	Permeability (mD)	Maceral composition (%)				Proximate analysis (%)
						V	I	E	M
DJ57-1	1884.28	Benxi	2.13	6.64	11.01	70.33	13.87	1.93	13.87	0.85	28.65	7.99	62.51
DJ57-2	1886.21	Benxi	2.12	3.23	8.36	79.96	10.5	0	9.54	0.77	29.73	8.98	60.52
DJ57-3	1887.32	Benxi	2.20	6.34	1.42	76.48	4.78	0	18.74	0.86	24.74	8.06	66.34

Notes: = maximum reflectance of vitrinite; V = vitrinite; I = inertinite; E = exinite; M = mineral; = moisture content; = ash yield; = volatile yield; = fixed carbon content.