L10-page21 - (vol liq. / vol rock) m w a = Archies Law...

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21 Archie’s Law • Empirical relationship defining bulk resistivity of a saturated porous rock: ρ 0 = bulk rock resistivity ρ w = pore - water resistivity a = empirical constant (0.6 < a < 1) m = cementation factor (1.3 poor, unconsolidated) < m < 2.2 (good, cemented or crystalline) φ = fractional porosity
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Unformatted text preview: (vol liq. / vol rock) m w a = Archies Law (continued) Formation Factor : Effects of Partial Saturation: S w is the volumetric saturation. n is the saturation coefficient (1.5 &lt; n &lt; 2.5). m w a F = = m w n w t a S =...
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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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