Archie S_wa

(Python 3.x)


Algorithm for computing apparent water saturation (S_wa) from effective (open) porosity Phi_e, formation water resistivity R_w and true formation resistivity R_t.

The Archie Law is empirical. Any reliable computation should be based on Special Core Analysis. Formation water samples (for example, with MDT) should be also considered.

\[S_{\mathit{wa}}=\left[\frac{AR_w}{\phi _e^mR_t}\right]^{\frac 1 n}\]


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