E = 250000000                    # Elastic modulus
nu = 0.3                         # Poisson ratio
kappa = 2.0*10**(-12)            # Permeability of soil
vis_w = 0.001                    # Water viscosity
vis_a = 3*10**(-5)               # CO2 viscosity
phi = 0.8                        # Solid volume fraction
gamma_w = 1100                   # Water density
R = 8.32                         # Gas constant 
T = 280                          # Medium temperature 
a = 0.364                        # CO2 constant                      
b = 0.00004267                   # CO2 constant