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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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### Transcript

• 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