In petrophysics, the only reliable source for the numerical value of both exponents is experiments on sand plugs from cored wells. The fluid  conductivity can be measured directly on produced fluid (groundwater) samples. Alternatively, the fluid  conductivity and the cementation exponent can also be inferred from downhole electrical conductivity measurements across fluid-saturated intervals. For fluid-saturated intervals () Archie's law can be written Hence, plotting the logarithm of the measured in-situ electrical conductivity against the logarithm of the measured in-situ porosity (Pickett plot), according to Archie's law a straight-line relationship is expected with slope equal to the cementation exponent and intercept equal to the logarithm of the in-situ fluid  conductivity.
In petrophysics, the only reliable source for the numerical value of both exponents is experiments on sand plugs from cored wells. The fluid electrical conductivity can be measured directly on produced fluid (groundwater) samples. Alternatively, the fluid electrical conductivity and the cementation exponent can also be inferred from downhole electrical conductivity measurements across fluid-saturated intervals. For fluid-saturated intervals () Archie's law can be written Hence, plotting the logarithm of the measured in-situ electrical conductivity against the logarithm of the measured in-situ porosity (Pickett plot), according to Archie's law a straight-line relationship is expected with slope equal to the cementation exponent and intercept equal to the logarithm of the in-situ fluid electrical conductivity.
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electrical
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electrical
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electrical