Table 2 Input variables and their probability distributions.

X₁

Natural fracture count

Discrete uniform U{1,6}

count

Fracture network density

X₂

Natural fracture angle

U{0, 90}

°

Fracture orientation anisotropy

X₃

Activated bedding planes

Discrete uniform U{1,6}

count

Bedding plane activation level

X₄

Horizontal stress difference

Uniform U{0,8}

MPa

Fracture propagation control

X₅

Injection rate

Uniform U{0,50}

ml/min

Energy input rate

X₆

Fluid viscosity

U{0,50}

mPa s

Fracturing fluid properties

X₇

Hybrid fluid viscosity ratio

Uniform {0,1}

/

Fluid compatibility