Effects of Borehole Arrangement on Methane Migration and Implications for High Efficiency Extraction in Intact and Tectonic Combined Coal Seams

Table 5

Optimal VSAB for different coal seam permeability ratios and coal seam thickness ratios.

Coal seam thickness ratios ()	Coal seam permeability ratios ()
	2	4	6	8	10
0.50	1.75	1.96	2.04	2.11	2.15
0.78	2.07	2.27	2.35	2.41	2.44
1.33	2.54	2.74	2.81	2.84	2.87
2.17	3.01	3.18	3.24	3.29	3.33
3.00	3.33	3.48	3.54	3.57	3.59