Characteristics of Fracture Propagation Induced by Supercritical CO₂ in Inter-Salt-Shale Reservoir

Table 2

Summary of the breakdown pressures under the corresponding experimental conditions.

Core number	Lithology	Bedding orientation	Diameter (mm)	Height (mm)	Axial (MPa)	Confining pressure (MPa)	Injection rate (ml/min)	Breakdown pressure (MPa)
No.1	Shale	Near-horizontal	25	50	25	20	40	20.17
No.2	Shale	Near-horizontal	25	50	25	20	40	21.22
No.3	Shale	Near-horizontal	25	50	25	20	40	20.13
No.4	Shale	Near-vertical	25	50	25	20	40	20.10
No.5	Shale	Near-vertical	25	50	25	20	40	21.10
No.6	Shale	Near-vertical	100	120	25	20	40	20.48
No.7	Salt	—	100	120	25	20	40	23.70