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) PowerPoint PPT Presentation


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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)

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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 reservoir seal capillary pressure

Capillary Pressure Required for Migration is

Function of Pore Size

s used in previous discussion

From Levorsen, 1967


Capillary pressure reservoir seal capillary pressure

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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