Capillary pressure reservoir seal capillary pressure saturation relationship s w model
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Capillary Pressure: Reservoir Seal Capillary Pressure / Saturation Relationship (S w * Model). Reservoir Seal. Seal. Seal. Fault (impermeable). Oil/water contact (OWC). Migration route. Reservoir rock. Hydrocarbon accumulation in the reservoir rock. Top of maturity. Source rock.

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Capillary pressure reservoir seal capillary pressure saturation relationship s w model

Capillary Pressure: Reservoir SealCapillary Pressure / Saturation Relationship (Sw* Model)


Reservoir seal
Reservoir Seal

Seal

Seal

Fault

(impermeable)

Oil/water

contact (OWC)

Migration route

Reservoir

rock

Hydrocarbon

accumulation

in the

reservoir rock

Top of maturity

Source rock


Reservoir seal1
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


Capillary Pressure Required for Migration is

Function of Pore Size

s used in previous discussion

From Levorsen, 1967


Capillary Pressure Required for Migration is

Function of Pore Size

From Levorsen, 1967


S w power law model
Sw* Power Law Model

  • Having an equation model for capillary pressure curves is useful

    • Smoothing of laboratory data

    • Determination of l

    • Analytic function for integration (future topic)

  • The Sw* Power Law Model is an empirical model that has proven to work well

    • Model parameters: Swi, Pd, l


S w power law model1
Sw* Power Law Model

  • Sw* rescales x-axis

Sw*=0

Sw*=1

Sw*, fraction


S w power law model2
Sw* Power Law Model

  • Power Law Equations plot as Log-Log straight line


S w power law model3
Sw* Power Law Model

  • Straight line models are excellent for

    • Interpolation and data smoothing

    • Extrapolation

    • Self Study: review Power Law Equations (y=axb) and how to determine coefficients, a and b given two points on the straight log-log line


S w power law model4
Sw* Power Law Model

  • Pd, l can be determined from Log-Log plot

  • But, Swi can be difficult to determine from Cartesian plot, if data does not clearly show vertical asymptote


S w power law model5
Sw* Power Law Model

  • Choosing wrong Swi limits accuracy of determining Pd, l


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