Permeability: from Cap Curve to Flowrate Graham Davis Chief Petrophysicist
Overview <ul><li>Saturation Height Functions </li></ul><ul><ul><li>Understand the reservoir controls on saturation distrib...
Common Sat-Height(Pc) Functions <ul><li>Leverett-J </li></ul><ul><li>Sigmoidal </li></ul><ul><li>Polynomial </li></ul><ul>...
Common Sat-Height(Pc) Functions <ul><li>Leverett-J </li></ul><ul><li>Sigmoidal </li></ul><ul><li>Polynomial </li></ul><ul>...
Thomeer Cap-Curve basics <ul><li>Thomeer function: </li></ul><ul><li>Bv oil    </li></ul><ul><li>   interconnected pore ...
a reservoir <ul><li>Palaeocene turbidite </li></ul><ul><li>Porosity: 22 – 26 pu </li></ul><ul><li>Perm: 0.4 – 1 D </li></u...
Petrophysical Log   – Routine Log Analysis
Petrophysical Log   – Core Data Calibration
Petrophysical Log   – Thin Bed Analysis
Petrophysical Log   – Linear Permeability Scales
Petrophysical Log   – Thomeer Cap curve analysis Facies coding
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
Petrophysical Log   – PLT Spinner Flow Profile
Petrophysical Log   – Differentiated Flow Profile
Further Examples   – Linear Permeability Profile PERM SPINNER PERM SPINNER
Further Examples   – Differentiated Flow Profile PERM SPINNER PERM SPINNER Not perfed
Conclusions <ul><li>Saturation height modelling can give  “Key insights”  into reservoir quality and productivity. </li></...
The Premium Value, Defined Growth Independent   The Future Clearly Defined St. Magnus House,   Guild Street, Aberdeen   AB...
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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.

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Transcript of "Permeability From Cap Curve To Flowrate"

  1. 1. Permeability: from Cap Curve to Flowrate Graham Davis Chief Petrophysicist
  2. 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. 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. 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. 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. 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. 7. Petrophysical Log – Routine Log Analysis
  8. 8. Petrophysical Log – Core Data Calibration
  9. 9. Petrophysical Log – Thin Bed Analysis
  10. 10. Petrophysical Log – Linear Permeability Scales
  11. 11. Petrophysical Log – Thomeer Cap curve analysis Facies coding
  12. 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. 13. Petrophysical Log – PLT Spinner Flow Profile
  14. 14. Petrophysical Log – Differentiated Flow Profile
  15. 15. Further Examples – Linear Permeability Profile PERM SPINNER PERM SPINNER
  16. 16. Further Examples – Differentiated Flow Profile PERM SPINNER PERM SPINNER Not perfed
  17. 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. 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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