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Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
Permeability   From Cap Curve To Flowrate
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 <ul><li>Saturation Height Functions </li></ul><ul><ul><li>Understand the reservoir controls on saturation distribution </li></ul></ul><ul><li>Thomeer Capillary Pressure Curve Analysis </li></ul><ul><ul><li>The “meaningful” co-efficients </li></ul></ul><ul><li>Step-by-step analysis workflow </li></ul><ul><ul><li>From cap-curve to flow profile </li></ul></ul><ul><li>Where to go from here………..? </li></ul><ul><ul><li>lets discuss! </li></ul></ul>
  • 3. Common Sat-Height(Pc) Functions <ul><li>Leverett-J </li></ul><ul><li>Sigmoidal </li></ul><ul><li>Polynomial </li></ul><ul><li>Exponential </li></ul><ul><li>Hyperbola </li></ul><ul><li>Entry Height </li></ul><ul><li>Trig-Tangent </li></ul><ul><li>Thomeer </li></ul><ul><li>Lambda </li></ul>
  • 4. Common Sat-Height(Pc) Functions <ul><li>Leverett-J </li></ul><ul><li>Sigmoidal </li></ul><ul><li>Polynomial </li></ul><ul><li>Exponential </li></ul><ul><li>Hyperbola </li></ul><ul><li>Entry Height </li></ul><ul><li>Trig-Tangent </li></ul><ul><li>Thomeer </li></ul><ul><li>Lambda </li></ul>
  • 5. Thomeer Cap-Curve basics <ul><li>Thomeer function: </li></ul><ul><li>Bv oil  </li></ul><ul><li> interconnected pore volume </li></ul><ul><li>Pe </li></ul><ul><li>= Capillary Entry Pressure </li></ul><ul><li>G </li></ul><ul><li>= Pore Geometrical factor </li></ul><ul><li>(curvature – related to Permeability) </li></ul>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 <ul><li>Palaeocene turbidite </li></ul><ul><li>Porosity: 22 – 26 pu </li></ul><ul><li>Perm: 0.4 – 1 D </li></ul>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 <ul><li>Saturation height modelling can give “Key insights” into reservoir quality and productivity. </li></ul><ul><li>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.) </li></ul><ul><li>Even apparently massively bedded reservoirs can exhibit marked heterogeneity . </li></ul><ul><li>There is petrophysical information in PLT data – lets integrate and use more of it. </li></ul>
  • 18. The Premium Value, Defined Growth Independent The Future Clearly Defined St. Magnus House, Guild Street, Aberdeen AB11 6NJ www.cnrl.com

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