A Thermal-Hydraulic-Mechanical Coupling Study of Heat Extraction from the Geothermal Reservoir with a Discrete Fracture Network

Table 2

Parameters of the coupling model.

Variable	Parameter	Value	Unit
	Rock matrix density	2700	kg·m^-3
	Specific heat capacity of water	4200	J·kg^-1·K^-1
	Specific heat capacity of the rock matrix	1000	J·kg^-1·K^-1
	Thermal conductivity of water	0.7	W·m^-1·K^-1
	Thermal conductivity of the rock matrix	3	W·m^-1·K^-1
	Porosity	0.05	1
	Matrix permeability		m^2
	Young’s modulus	30	GPa
	Poisson’s ratio	0.25	1
	Biot’s coefficient	1	1
	Coefficient of volumetric expansion		1/K
	Storage coefficient of the matrix		1/Pa
	Initial aperture of fractures	0.18	mm
	Standard deviation of the fracture surface height	0.005	mm