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

Table 4

Percentage of each fracture type with different joint strengths.

Joint strength (strength ratio to the base)	Approach angle	Sjs	Sjt	Pbs	Pbt
(0.8 : 1)	30°	0.358	0.065	0.215	0.362
	45°	0.412	0.029	0.241	0.317
	60°	0.508	0.013	0.217	0.262
	75°	0.477	0.002	0.229	0.292
	90°	0.425	0.015	0.230	0.331
(set as a base)	30°	0.253	0.022	0.231	0.493
	45°	0.337	0.014	0.243	0.405
	60°	0.439	0.018	0.189	0.353
	75°	0.399	0.009	0.256	0.336
	90°	0.159	0.000	0.322	0.519
(1.2 : 1)	30°	0.167	0.037	0.271	0.525
	45°	0.129	0.016	0.255	0.600
	60°	0.286	0.002	0.232	0.480
	75°	0.296	0.006	0.257	0.442
	90°	0.034	0.000	0.365	0.601