Brittleness Index of High-Rank Coal Reservoir and Its Influencing Factors in Mabidong Block, Qinshui Basin, China

Table 5

Coal quality parameters of No. 3 and No. 15 coal seams in the Mabidong block (air-dried basis).

Coal-body structure	Coal seam	Moisture (%)	Ash (%)	Volatile (%)	Fixed carbon (%)
Primary structure	No. 3	0.82	10.026	8.26	69.75
	No. 15	0.807	19.52	9.9	80.91
	Average	0.811	12.875	8.75	77.56
Cataclastic structure	No. 3	0.98	10.505	8.39	79.545
	No. 15	0.125	11.835	8.495	80.125
	Average	0.695	10.948	8.425	79.932
Granulate structure	No. 3	0.978	17.57	9.96	71.486
	No. 15	0.954	12.552	8.89	84.183
	Average	0.968	15.48	9.52	76.103