New Insights into the Drill Cutting Characteristics and Fault Distribution in Gas-Containing Coal Seams

Table 1

Drilling completion parameters at sampling points.

Coal seam	Sample no.	Pressure measuring site	Borehole depth (m)	Borehole position and characteristics	Quantity of drill cuttings (kg)
10# coal seam of Luling Coal Mine	LL-1	II104 east wing, 1# borehole	50	Normal coal seam	15.32
	LL-2	II1041 reverse machine lane	50	Fault damage zone	18.24
	LL-3	II1041 machine lane, 3# borehole	50	Fault damage zone	18.02
15# coal seam of Yuenan Coal Mine	YN-1	Excavation head 200 m	95	Normal coal seam	14.23
	YN-2	Excavation head 300 m	95	Normal coal seam	14.89
	YN-3	Excavation head 400 m	95	Fault damage zone	15.23
3# coal seam of Sihe Coal Mine	SH-1	63013 roadway, excavation head 280 m	150	Fault core	15.95
	SH-2	63013 roadway, excavation head 560 m	100	Normal coal seam	15.52
	SH-3	63013 roadway, excavation head 840 m	50	Normal coal seam	14.85
	SH-4	63013 roadway, excavation head 1,120 m	100	Normal coal seam	15.35
	SH-5	63013 roadway, excavation head 1,400 m	150	Fault damage zone	16.14
	SH-6	63011 roadway, excavation head 420 m	50	Normal coal seam	13.37
	SH-7	63011 roadway, excavation head 700 m	100	Normal coal seam	14.33
	SH-8	63011 roadway, excavation head 980 m	150	Fault damage zone	15.71
	SH-9	63011 roadway, excavation head 1,260 m	100	Normal coal seam	15.24
	SH-10	63011 roadway, excavation head 1,540 m	50	Normal coal seam	13.40