Discrete Element Analysis for Hydraulic Fracture Propagations in Laminated Reservoirs with Complex Initial Joint Properties

Table 5

Number of each fracture type with different tensile-to-shear strength ratios.

Joint strength (tensile-to-shear strength ratio)	Approach angle	Sjs	Sjt	Pbs	Pbt	Sum
(0.75 : 1)	30°	147	13	134	286	580
	45°	256	11	185	308	760
	60°	292	12	126	235	665
	75°	178	4	114	150	446
	90°	42	0	85	137	264
(1 : 1)	30°	286	15	218	302	821
	45°	490	24	272	370	1156
	60°	328	8	123	167	626
	75°	285	0	111	140	536
	90°	207	4	94	132	437
(1.25 : 1)	30°	625	16	264	411	1316
	45°	698	21	244	380	1343
	60°	517	7	164	198	886
	75°	297	0	107	139	543
	90°	333	4	107	134	578