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LaTeX Math Block
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M_\alpha(s) = \frac{k_\alpha}{\mu_\alpha} = k_{air} \cdot \frac{k_{r \alpha}}{\mu_\alpha}

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LaTeX Math Inline
body\displaystyle k_\alpha(s)

formation permeability to fluid 

LaTeX Math Inline
body\alpha
-phase

LaTeX Math Inline
body\displaystyle \mu_\alpha

dynamic viscosity of fluid

LaTeX Math Inline
body\alpha
-phase

LaTeX Math Inline
body\displaystyle k_{air}

absolute permeability to air

LaTeX Math Inline
body\displaystyle k_{r\alpha}(s)

relative formation permeabilityto fluid 

LaTeX Math Inline
body\alpha
-phase

LaTeX Math Inline
body\displaystyle M_{r\alpha}(s) = \frac{k_{r \alpha}}{\mu_\alpha}

relative phase mobility

LaTeX Math Inline
bodys

reservoir saturation

LaTeX Math Inline
body\{ s_w, \, s_o, \, s_g \}


In most practical case of a 3-phase fluid model this will be:

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