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Magnetic Resonance Imaging Logging, development and evolution as a fundamental evaluation tool in the reservoir manageme

Magnetic Resonance Imaging Logging, development and evolution as a fundamental evaluation tool in the reservoir management. Ron Cherry, Maged Fam and Emiliano López. Geological & Reservoir Overview. Formation Evaluation Problems

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Magnetic Resonance Imaging Logging, development and evolution as a fundamental evaluation tool in the reservoir manageme

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  1. Magnetic Resonance Imaging Logging, development and evolution as a fundamental evaluation tool in the reservoir management Ron Cherry, Maged Fam and Emiliano López

  2. Geological & Reservoir Overview Formation Evaluation Problems High uncertainty in reservoir evaluation using conventional Log Analysis, due to: • Multilayer reservoirsmade up of an average of 20 stacked layers, about 5 mt. each. • Low formation water salinity • Several water/oil and gas/light oil contacts randomly distributed throughout a rock column of 1000 mts. (average 1500 to 2500 mts.) • Complex lithology (shaly and tuffaceous sand reservoirs) • Different hydrocarbon types

  3. Core Porosity vs Permeability Permeability (md) Porosity (%) Permeability (md) Porosity (%) Core measurements on samples from about 60 wells, 800 samples from San Jorge Basin

  4. Matrix Density Distribution in so called “Sandstone” from San Jorge Basin Grain Density Vs Core Porosity Grain Density (G/c3) Core Porosity (%)

  5. Core Porosity Vs MRI Core Porosity Core Porosity (%) MRI Core Porosity (%) MRI Core Porosity vs. Core Porosity San Jorge Basin

  6. Geometric Mean T2 Cutoff Vs. Depth Depth (m) Geometric Mean T2 Cutoff (ms) Geometric Mean T2 Cutoff vs. Depth The high degree of variation in the T2 cutoff range may cause some inconsistencies in the final Interpretation. Thus the SBVI method is a better technique for determining BVI.

  7. Spectral Bulk Volume Irreductible SBVI

  8. Core Permeability and MRI Permeability Models Vs Depth Depth (m) Core Permeability and MRI Permeability Models (md) Core Permeability and MRI Permeability Models Vs Depth N.B.: MRI Permeability data is based on SVBI model

  9. MRI Permeability Models Vs Core Permeability Core Permeability (md) MRI Permeability Models (md) Core Permeability Vs MRI Permeability Models N.B.: MRI Permeability data is based on SVBI model

  10. MRIL Life Cycle Met reservoir Objectives Specify Objectives Reservoir Properties & Problems Borehole Conditions Size, mud, temp….etc Test Results Yes MRIL Pre-job Planning Compare No Data Processing & Interpretation Activation Selection @ Logging speed Prognosis Selection of Zones to Test STIMRIL Field Log QC Resistivity log Core Analysis if available

  11. water oil gas water oil gas oil water MRI Forward Model Tool Physics Acquisition Parameters G, TE, TW MRIL Forward Modeling Planner Expected Fm. Fluid Properties Temp., Pressure & Viscosity Mud Properties Borehole Size

  12. Petrophysical Solution!!! MRI Specific Acquisition and Interpretation Techniques “one logging pass” EDM Enhanced Diffusion Method (Hydrocarbons 2-50 cp) TDA Time Domain Analysis (Hydrocarbons < 2 cp)

  13. But….!!!

  14. ShortTE LongTE MRI Prognosis: Heavy OIL 1800 L/H 75 % SW MRI Prognosis: Water 2400 L/H 100 % SW

  15. How can we distinguish Heavy OIL from Water ??? Special Design for Heavy OIL detection… MRIL Ultra Long TE Activation

  16. ShortTE LongTE UltraLongTE MRI Prognosis: Heavy OIL 1800 L/H 75 % SW MRI Prognosis: Water 2400 L/H 100 % SW

  17. ShortTE LongTE UltraLongTE Heavy OIL Detection Example Initial Test Result (8hs Swabbing): 2400 L/H – 100% SW Final Test Result (24hs Swabbing): 2400 L/H – 88% SW

  18. Halliburton Question regarding details on test results Dear Customer: “…If We understand well, the formation was producing water for 8 hours before starting to produce Oil …?? You have insisted to keep it producing because there was a very good signal on the MRI Ultra-Long Te activation,….. Is that correct …??...” Customer’s response “It's correct...It has been a very good news today, because up to yesterday, we couldn't believe that from that signal it would be only water... We insisted and it was 2400 l/h x 88% of water (may be the amount of water would have declined if we would wait more time... but for us it was enough seeing some oil)…”

  19. Fluid Typing: Light OIL Shot-Te/Long-Tw TDA EDM Long-Te/Long-TW Dif. S.-Te/L.TW-S.Tw MRI Prognosis Light Oil w/ HGOR Composite Log MRI Interpretation EDM + TDA Flow 920 L/H 40 % SW

  20. Fluid Typing: GAS MRI Prognosis Light OIL MRI Prognosis GAS Flow x 12mm Wet GAS P/D 280psi P/E 1560 psi MRI Prognosis GAS

  21. Halliburton’s Reservoir Fluids Prognosis Sheet Based on MRIL Interpretation

  22. Conclusions • Magnetic Resonance Imaging (MRI) Logs as a fundamental evaluation tool in the reservoir Management • Determination of Porosity, Independent to Matrix • Determination of Bulk Volume Irreducible Water • Reliable Permeability Indicator (absolute after Calibration) • Identify Fluid Type (Gas, Oil & Water) by zone • Identification of Rock Quality…Permeability, Porosity & Clay • Determine variations of Hydrocarbon types (Resistivity independent)… • …Heavy, Intermediate, Light Oil or Gas

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