Hydraulic Fracturing Behavior in Shale with Water and Supercritical CO₂ under Triaxial Compression

Figure 7

Macroobservation of the shale fracture morphology after fracturing. (a) Shale specimens with different bedding plane angles fractured using water. (b) Shale specimens with different bedding plane angles fractured using SC-CO₂. (The left-bottom diagrams show the relative orientation of hydraulic fracture with respect to the bedding plane. The red lines represent the macrofractures while the dashed lines represent the bedding planes.)

(a)

(b)