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Permeability   From Cap Curve To Flowrate
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Permeability From Cap Curve To Flowrate

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Presentation to illustrate links between saturation height relationships, permeability and flow prediction.

Presentation to illustrate links between saturation height relationships, permeability and flow prediction.

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  • 1. Permeability: from Cap Curve to Flowrate Graham Davis Chief Petrophysicist
  • 2. Overview
    • Saturation Height Functions
      • Understand the reservoir controls on saturation distribution
    • Thomeer Capillary Pressure Curve Analysis
      • The “meaningful” co-efficients
    • Step-by-step analysis workflow
      • From cap-curve to flow profile
    • Where to go from here………..?
      • lets discuss!
  • 3. Common Sat-Height(Pc) Functions
    • Leverett-J
    • Sigmoidal
    • Polynomial
    • Exponential
    • Hyperbola
    • Entry Height
    • Trig-Tangent
    • Thomeer
    • Lambda
  • 4. Common Sat-Height(Pc) Functions
    • Leverett-J
    • Sigmoidal
    • Polynomial
    • Exponential
    • Hyperbola
    • Entry Height
    • Trig-Tangent
    • Thomeer
    • Lambda
  • 5. Thomeer Cap-Curve basics
    • Thomeer function:
    • Bv oil 
    •  interconnected pore volume
    • Pe
    • = Capillary Entry Pressure
    • G
    • = Pore Geometrical factor
    • (curvature – related to Permeability)
    Bv oil  - 30 pu Bv oil  - 25 pu Bv oil  - 15 pu Pe = 150 G = 0.05 G = 0.25 G = 0.50 Back-Calculate G at each depth  Permeability Pe = 75 Pe = 15 Log Sw
  • 6. a reservoir
    • Palaeocene turbidite
    • Porosity: 22 – 26 pu
    • Perm: 0.4 – 1 D
    Phi – K crossplot Small dynamic range in Porosity
  • 7. Petrophysical Log – Routine Log Analysis
  • 8. Petrophysical Log – Core Data Calibration
  • 9. Petrophysical Log – Thin Bed Analysis
  • 10. Petrophysical Log – Linear Permeability Scales
  • 11. Petrophysical Log – Thomeer Cap curve analysis Facies coding
  • 12. Petrophysical Log – Thomeer Permeability (High-K Streaks) Hi-K Hi-K Hi-K Hi-K Hi-K Hi-K Hi-K Hi-K Facies coding
  • 13. Petrophysical Log – PLT Spinner Flow Profile
  • 14. Petrophysical Log – Differentiated Flow Profile
  • 15. Further Examples – Linear Permeability Profile PERM SPINNER PERM SPINNER
  • 16. Further Examples – Differentiated Flow Profile PERM SPINNER PERM SPINNER Not perfed
  • 17. Conclusions
    • Saturation height modelling can give “Key insights” into reservoir quality and productivity.
    • This approach is only valid for virgin oil zones where saturation is controlled by original capillary processes rather than current production mechanisms. (Also subject to resistivity tool resolution issues.)
    • Even apparently massively bedded reservoirs can exhibit marked heterogeneity .
    • There is petrophysical information in PLT data – lets integrate and use more of it.
  • 18. The Premium Value, Defined Growth Independent The Future Clearly Defined St. Magnus House, Guild Street, Aberdeen AB11 6NJ www.cnrl.com