Parameter Sensitivity Analysis of the Hydraulic Fracture Growth Geometry in a Deep Shale Oil Formation: An Experimental Study
Table 2
Diagram of experimental fractures in Brazilian splitting.
Core number
Tensile strength (MPa)
Pictures before test
Pictures after test
Fracture morphology of hydraulic fracturing
Parallel to bedding
14.6
The fracture starts and extends along the layer until the sample is completely broken. The propagation path is bedding, and the fracture surface is bedding surface, which is smooth and flat without turning.
Perpendicular to bedding
23
Both the fracture self-loading jaw and the center of the disc can fracture, but the local small-scale bedding fracture around the fracture only occurs when the fracture path is offset. The incomplete penetration of the fracture bedding indicates that the fracture of the bedding is caused by the tensile stress induced by eccentric compression after the fracture of the sample.
