(1)	$\begin{array}{l}\displaystyle \sigma_f = s_w \cdot \sigma_w(T) + s_o \cdot \sigma_o(T) + s_g \cdot \sigma_g(T)\end{array}$

where

$\begin{array}{l}s_w, \, s_o, \, s_g\end{array}$	volumetric fractions of water, oil and gas phases: $\begin{array}{l}s_w + s_o + s_g = 1\end{array}$
$\begin{array}{l}\sigma_w(T), \, \sigma_o(T), \, \sigma_g(T)\end{array}$	electrical conductivity of the water, oil and gas phases
$\begin{array}{l}T\end{array}$	fluid temperature

In many practical applications the

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