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High Resolution Carbonate Reef Interpretation Using Cross Well Data Thomas Morgan, Ph.D., Schlumberger Mike Raines*, Whiting Petroleum *formerly with Sandridge.

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Presentation on theme: "High Resolution Carbonate Reef Interpretation Using Cross Well Data Thomas Morgan, Ph.D., Schlumberger Mike Raines*, Whiting Petroleum *formerly with Sandridge."— Presentation transcript:

1 High Resolution Carbonate Reef Interpretation Using Cross Well Data Thomas Morgan, Ph.D., Schlumberger Mike Raines*, Whiting Petroleum *formerly with Sandridge Energy

2 Sites: Michigan West Texas Focus: Gross Structure Internal Structure Depositional Environments

3 Geological Information Well Logs Geophysical Data Geological Interpretation

4 Michigan Silurian Reef Single profile Isolated pinnacle reef Only one additional well No surface seismic available

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7 Tomographic Velocity Inversion Picked Direct Arrivals 3D Thin Layer Model 3D Ray Tracing Model Interfaces and Layer Parameters Described by Chebyshev Polynomials

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9 Imaging Kirchhoff Integral Prestack Reflection Imaging Depth Dip Oriented and Aperture Limited Ray Trace Travel Times from Tomographic Velocities Angle Gather Output

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11 45 degrees30 degrees70 degrees

12 Interpretation Approach Profile is in Depth Exact depth tie at the wells – no time to depth conversion needed Resolution at the outcrop level – human scale geology Geological Interpretation versus Geophysical Interpretation

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14 Burnt Bluff Carbonate Grey Niagaran Evaporites Reef Zone

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16 Bioherm

17 Organic Reef Bioherm

18 Organic Reef

19 Bioherm Organic Reef Reef Rubble

20 Organic Reef Bioherm Supratidal Island

21 Bioherm Organic Reef Supratidal Island Tidal Flats

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23 West Texas Permian Reef Multiple profiles More complicated structure Better well control Surface seismic available

24 Left Middle Right

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26 ~ Reef Top Marker Near OWC

27 ~ Reef Top (Erosional) Marker Near OWC On Lap Shaley Lag Deposit Stacked Mounds Inter-Mound CO 3 Debris

28 ~ Reef Top Stacked Mounds Inter-Mound CO 3 Debris

29 ~ Reef Top Shaley Lag Deposit

30 Conclusions Depth profiles provide unambiguous well ties Resolution allows a truer look at the geology Geophysical effects pushed down to smaller scale Reservoir level geologic Interpretation is possible

31 High Resolution Interpretation of a Permian Reef Michael A. Raines, Sandridge Tertiary, LLC, Thomas R. Morgan*, Ph.D., Schlumberger Poster PDC P2, Station D1 Tuesday, October 27 at 11:40 a.m.

32 Acknowledgments: We would like to thank Sandridge Energy and Michigan Technological University for the use of the data. References: Bube, K., and R. Langan, 1999, On a continuation approach to regularization for crosswell tomography: 69th Annual International Meeting, SEG, Expanded Abstracts, Liao, Q., and G. A. McMechan, 1997, Tomographic imaging of velocity and Q, with application to crosswell seismic data from the Gypsy Pilot Site, Oklahoma: Geophysics, 62, Quan, Y., and J.M. Harris, 1997, Seismic attenuation tomography using the frequency shift method: Geophysics, 62, Huh, M.H., L.I. Briggs, and D. Gill, 1977, Depositional Environments of Pinnacle Reefs, Niagaran and Salina Groups, Northern Shelf, Michigan Basin, in: Studies in Geology No. 5, Reefs and Evaporites – Concepts and Depositional Models, AAPG, J.H. Fisher ed.


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