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B_w = B_w(p_{\rm ref}), \ B_o = B_o(p_{\rm ref}), \ B_g = B_g(p_{\rm ref})

R_{sn}(p) = \frac{R_s B_g}{B_o} \ , \quad R_{vn}(p) = \frac{R_v B_o}{B_g}

R_{sp}(p) = \frac{\dot R_s B_g}{B_o} \ , \quad R_{vp}(p) = \frac{\dot R_v B_o}{B_g}

s(\mathbf{r}) = \{ s_w(\mathbf{r}), \ s_o(\mathbf{r}), \ s_g(\mathbf{r})  \}

c_t(s) = c_r (1 + R_{sn} s_o + R_{vn} s_g) + c_w s_w + c_o s_o (1+R_{sn}) + c_g s_g (1 + R_{vn}) + R_{sp} s_o + R_{vp} s_g

с_r(p_{\rm ref}) 

с_w(p_{\rm ref}), \ с_o(p_{\rm ref}), \ с_g(p_{\rm ref} 

M(s, P) = M_w + M_o \big( 1 + R_{sn} \big) + M_g \big( 1 + R_{vn} \big)

M_w(s,p) = k_a M_{rw}(s,p), \quad M_o(s,p) = k_a M_{ro}(s,p), \quad M_g(s,p) = k_a M_{rg}(s,p)

k_a(\mathbf{r}) \bigg| _{p_{\bf ref}}

\alpha_{rw}(s) = \frac{k_{rw}(s)}{\mu_w}, \quad \alpha_{ro}(s) = \frac{k_{ro}(s)}{\mu_o}, \quad \alpha_{rg}(s) = \frac{k_{rg}(s)}{\mu_g}

\mu_w = \mu_w(P_{\bf ref}), \quad  \mu_o = \mu_o(P_{\bf ref}), \quad \mu_g = \mu_g(P_{\bf ref})

\rho_{\alpha} = \frac{ \alpha_{rw} \rho_w + \alpha_{ro} \rho_o (1 + R_{sn})  + \alpha_{rg} \rho_g (1+R_{vn}) }{ \alpha_{rw}  + \alpha_{ro}  (1 + R_{sn})  + \alpha_{rg}  (1+R_{vn}) }

\rho_w = \rho_w(P_{\rm ref}), \ \rho_o = \rho_o(P_{\rm ref}), \ \rho_g = \rho_g(P_{\rm ref})

 g = 9.81 \ \textrm{m} / \textrm{s}^2

 \chi =  \left \langle \frac{k} {\mu} \right \rangle \frac{1}{\phi c_t} \bigg| _{p_{\bf ref}}

\sigma = \alpha \ h = \left \langle \frac{k} {\mu} \right \rangle \ h \bigg| _{P_{\bf ref}}

h