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

Table 2

Proximate analysis results and vitrinite reflectances of the samples.

Sample No.	(%)	(%)	(%)	(%)	(%)	(%)
BD1	2.16	12.65	23.89	28.04	61.30	1.21
BD2	3.63	9.13	35.09	40.22	52.15	0.85
BD4	3.45	7.72	32.40	36.47	56.43	0.80
BD6	3.19	5.78	36.61	40.22	54.41	0.57
BD7	2.60	16.59	30.88	38.21	49.93	0.99
BD8	3.47	5.12	37.30	40.80	54.12	0.83
BD9	2.65	14.56	32.85	39.68	49.94	0.77
BD10	3.20	5.39	35.22	38.53	56.19	0.86
BD11	2.77	7.86	36.40	40.73	52.97	0.59
BD12	2.70	10.05	34.79	39.87	52.46	0.81
BD13	3.08	7.08	35.57	39.60	54.27	0.76
BD14	2.06	29.52	20.93	30.59	47.49	1.40
Average value	2.91	10.95	32.66	37.75	53.47	0.78

: moisture, air dry basis, %; : ash yield content, air dry basis, %; : volatile, air dry basis, %; daf: dry ash free basis; FC_ad: fixed carbon, air dry basis, %; : maximum vitrinite reflectance, %.