PETE311_06A_Class17_(Maggard)

PETE311_06A_Class17_(Maggard) - Electrical Properties...

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Electrical Properties Archie’s Law
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R t R o R w R e s i t v y Cube of water having resistivity, R w Non-shaly rock, 100% saturated with water having resistivity, R w Rock containing pores saturated with water and hydrocarbons φ = 100% S w = 100% φ = 20% S w = 100% φ = 20% S w = 20% Formation Factor Equation Saturation Equation
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• The formation factor (F) depends on – Porosity of the formation, – Pore geometry - tortuosity – Lithology of the formation – Degree of cementation, and – Type and amount of clay in the rock Formation Factor From J. Jensen, PETE 321 Lecture Notes
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• Archie’s equation for formation factor is a power law model: F=a· φ -m Formation Factor Equation Rock type 1 Rock type 2 1000 100 10 1 .01 .1 1.0 φ F Note: S w =1 From NExT, 1999
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Formation Factor - Example Core Data From J. Jensen, PETE 321 Lecture Notes
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•F=a · φ -m a = constant 1.0 for most formations m = cementation factor 2 for most formations • Other commonly used values – Sandstones: •F = 0 .8 / φ 2 (Tixier) •0 .62 / φ 2.15 (Humble) – Carbonates • F = 0.8/ φ 2 Formation Factor From J. Jensen, PETE 321 Lecture Notes
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PETE311_06A_Class17_(Maggard) - Electrical Properties...

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