Study on Fracture Morphological Characteristics of Refracturing for Longmaxi Shale Formation

Table 1

Material parameters of shale rock in true triaxial fracturing tests.

Properties	Value
Young’s modulus (GPa)	25.50
Uniaxial compressive strength (MPa)	109.10
Tensile strength (MPa)	9.50
Cohesive force (MPa)	20.35
Friction angle	36.12
Porosity (%)	1.24
Permeability (Darcy)	0.00004
Poisson’s ratio	0.185
The average velocity (m/s)	4860