PETE311_06A_Class23_(Maggard)

PETE311_06A_Class23_(Maggard) - Capillary Pressure:...

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Capillary Pressure: Reservoir Seal Capillary Pressure / Saturation Relationship (S w * Model)
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Seal Reservoir rock Seal Migration route Oil/water contact (OWC) Hydrocarbon accumulation in the reservoir rock Top of maturity Source rock Fault (impermeable) Reservoir Seal Seal
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Reservoir Seal • The seal for a reservoir is usually provided by a water wet zone with low (but finite) permeability – Typically a shale • Darcy’s Law would indicate that with a finite permeability, gravity effect alone would cause petroleum to pass upward through the seal due to density difference, over a long (geologic) time period – Darcy’s Law is a “Rate Process” (ENGR 112) • For multiple phases flowing, the Darcy flow potential includes pressure, gravity, and capillary pressure terms – Effect of displacement pressure of seal halts upward migration of petroleum in trap – Displacement pressure of seal can limit total height of reservoir, from free water level to highest elevation in reservoir
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Capillary Pressure Required for Migration is Function of Pore Size σ used in previous discussion From Levorsen, 1967
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From Levorsen, 1967 Capillary Pressure Required for Migration is Function of Pore Size
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PETE311_06A_Class23_(Maggard) - Capillary Pressure:...

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