PETE311_06A_Class18_(Maggard)

PETE311_06A_Class18_(Maggard) - Electrical Properties...

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Unformatted text preview: Electrical Properties Effect of Clays Effect of Wettability Clays provide an alternate path for flow of electrical current, violating the assumption in Archies Equations that all current flows due to conductivity of formation water Archies Equations are too pessimistic for shaly formations missed opportunities for development of potentially productive reservoirs wrong amounts and type of investment in reservoir development due to skewed economic projections Effect of Clays on Electrical Properties The formation factor ( F=R o /R w ) is constant for a clean sand; F decreases for shaly sand as value of R w increases due to conductivity of clays becoming more significant compared to conductivity of water same core sample with clay present varying only R w Effect of Clays on Formation Factor Clays provide an alternate path for flow of electrical current The best saturation equation for shaly formations seems to vary Jordan and Campbell, Table 6.9 shows Jordan and Campbell, Table 6....
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PETE311_06A_Class18_(Maggard) - Electrical Properties...

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