s_\alpha = \frac{V_\alpha}{V_\phi}

\sum_\alpha V_\alpha = V_\phi

\sum_\alpha s_\alpha = 1

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

s_w + s_o + s_g = 1

where

	water phase saturation at reservoir location
	oil phase saturation at reservoir location
	gas phase saturation at reservoir location

See Also