In petrophysics, Archie's law relates the in-situ electrical conductivity of sedimentary rock to its porosity and brine saturation: Here, ? denotes the porosity, Ct the electrical conductivity of the fluid saturated rock, Cw represents the electrical conductivity of the brine, Sw is the brine saturation, m is the cementation exponent of the rock, and n is the saturation exponent.

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