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Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
Multi-Transient ElectroMagnetics
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Multi-Transient ElectroMagnetics

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  • Multi Transient ElectroMagnetics. Table of content: (sorry Add 3 to numbers above 9!) 2-5 What MTEM is. Logging Before Drilling 6-9 MTEM applications 10-11 EM techniques 12-21 MTEM method 22-26 – France test and Reciprocity 27-40 RTA 41-46 Processing and Inversion 47-49 Data Examples 49-50 Recording System 51 Conclusion
  • Transcript

    • 1. Multi-Transient ElectroMagnetics Multi-Transient EM Aug 2007
    • 2. The need for an EM solution
      • Seismic methods determine structure
      • The structure may reveal a potential reservoir (in general a porous rock bounded by a cap)
      • The porous rock contains a fluid (water or hydrocarbons, or a mixture) but seismics cannot usually determine the nature of that fluid – drill!
      • Resistivity – a physical rock property determined through EM – can make that distinction – drill in the right place!
    • 3. Resistivities of Rocks Diagram courtesy Henri Brasse http://userpage.fu-berlin.de~hbrasse
    • 4. Fluid saturation and rock properties P-wave velocity is affected only slightly by hydrocarbon saturation in a porous rock. Resistivity can vary by more than an order of magnitude. Picture redrawn from Wilt M. and Alumbaugh D. 1998, The Leading Edge 17, 487-492.
    • 5. Direct Resistivity Indicator Seismic traces Seismic amplitudes and attributes Logging measurements Logging before drilling MTEM Resistivity
    • 6. MTEM for resistivity
      • MTEM is sensitive to transverse resistance.
      • Red is more resistive.
      • Stronger resistivity comes from:
        • Thicker interval
        • Higher saturation
        • Higher porosity
        • Less clay and shale
    • 7.
      • Cases
      • Gas storage monitoring
      • Imaging Heavy Oil
      • Imaging in structurally complex subsurface
      • Imaging thrust belt.
      • Imaging where seismic and drilling is very expensive
      • Locating steam flood front in SAGD production monitoring
      • Identifying channel sands with low acoustic impedance contrast
      • Proving up reserves to increase reserves-production ratio
      • De-risking drilling location decisions.
      MTEM Challenges to date
    • 8. Gas storage monitoring
    • 9. Shallow Heavy Oil resistivity scale
    • 10. Thrust Belt
    • 11. Thrust belt
    • 12.  
    • 13.  
    • 14.  
    • 15.  
    • 16.  
    • 17.  
    • 18.  
    • 19. MTEM Global Operations Onshore Offshore
    • 20. Land acquisition
      • Surface conditions successfully operated in
        • Farmland
        • Desert
        • Jungle
        • Plantation
        • Urban
        • Rice paddies
        • Muskeg
        • Open prairie
        • Beach / Littoral
    • 21. MTEM Hardware
    • 22. Receiver station and battery Receiver box and battery in the line. Box with acquisition and telemetry electronics. Grounded with earth electrode.
    • 23. Source Buggy and Unit Source buggy with generator and source unit. Source engineer with Zonge and control electronics.
    • 24. Source Electrodes An array of 1 to 40 electrodes hammered into 80-100cm into the ground. Fenced off (3m) and manned when source cables are connected.
    • 25. Source Safety system Source activation and emergency shut off at the source electrode array. Emergency shutoff cuts power to the entire system.
    • 26. Source electrode transport Source electrode transport buggy. Low ground pressure buggy to transport the 40 electrodes per source pole location.
    • 27. Land Operations
    • 28. A Step Change in the use of EM Input Recording (combination of Earth and System Responses) Airwave Earth response
    • 29. Impulse response - land Offset = 1 km Air Wave Earth Impulse Response
    • 30. 1D model Source 1A.m Source Receiver (V) x = 1000m 500m 20 Ohm.m 500 Ohm.m Dx 25m
    • 31. Impulse response Effect of fluid saturation Offset = 1 km
    • 32. Impulse response – land Convolution with a system response Air Wave
    • 33. Impulse response measurements Full Waveform Amplitudes Travel Time
    • 34. Multi-Transient Theoretical PRBS In red Measured Signal In black
    • 35. Deconvolution Input amps at source Output volts at receiver Deconvolved impulse response (ohms/m 2 /s)
    • 36. Deconvolved Data – common offset Air Wave High peak amplitude and early arrival time indicate a resistor.
    • 37. Data Processing Apparent resistivity Step Response Integration Peak picking Impulse Response
    • 38. Inversion model and response Offset 1000m
    • 39. Inversion model and response Offset 2000m
    • 40. Inversion model and response Offset 2500m
    • 41. Inversion model and response Offset 3000m
    • 42. Inversion model and response Multi-offsets 2000m, 2500m and 3000m
    • 43. Results summary 4 ways to detect hydrocarbons 2-D DC resistivity inversion Traveltime to resistivity mapping 1-D Occam Inversion 1800m Common offset section
    • 44. What does MTEM provide
      • Feasibility study – desktop
      • Feasibility study – field assessment
      • Survey design
      • Acquisition
      • Processing
      • Inversion
      • Technical/interpretation support
        • 3D modeling, advanced inversions
    • 45. Well Logs
    • 46. 1D Modeling
      • % difference in impulse response .
    • 47.
      • We take a collaborative approach with the client
      • Problem solving, asset-based
      • Oilfield services contractor
      • Support asset team with their interpretation and decisions
      How do we work? Top Reservoir from seismic
    • 48. Multi-Transient EM
    • 49. Inversion model and response Offset 1500m
    • 50. Inversion model and response Offset 3500m

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