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Seismic Reservoir Characterization of the Morrow A Sandstone

Seismic Reservoir Characterization of the Morrow A Sandstone. Postle Field, Texas County, Oklahoma. Thomas L. Davis & Robert D. Benson CSM Scott Wehner, Chaparral Energy, and Michael D. Raines and Roger Freidline, Whiting Oil and Gas Corp. Postle Field Site of the 24-5 Well.

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Seismic Reservoir Characterization of the Morrow A Sandstone

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  1. Seismic Reservoir Characterization of the Morrow A Sandstone Postle Field, Texas County, Oklahoma Thomas L. Davis & Robert D. Benson CSM Scott Wehner, Chaparral Energy, and Michael D. Raines and Roger Freidline, Whiting Oil and Gas Corp

  2. Postle FieldSite of the 24-5 Well

  3. Location of Postle Field Postle Field Modified from Johnson (1989)

  4. Morrow Stratigraphic Section

  5. Postle Field – Geologic Setting Pennsylvanian Morrow (~217Ma) paleogeography. Modified from Bowen and Weimer (2003).

  6. Study Location in the Hovey Morrow Unit

  7. Net Pay A Sand

  8. Postle Reservoir Parameters • Depth 6100’ • Producing formation Upper Morrow sand • Average Thickness 28’ (10-70) • Porosity 17% (10-23) • Permeability 50 mD (20-500) • Soi 70% • ReservoirTemp 140 F • Reservoir pressure Initial 1630 psi • Reservoir Pressure Current 200 - 2300 - 4500 psi • Minimum Miscibility Pressure 2100 psi • Oil Gravity 40 API • Oil FVF orig 1.28 • Oil FVF current 1.20 • Well spacing 40 Ac (80-Ac 5-spot inj. patterns) • Area 26000 Ac • Cumulative Production 120 MMBO (40% OOIP) • OOIP ~300 MMBO

  9. Motivation Dry holes drilled

  10. Cross Section Valley – Fill Sandstones East West 6000 ft Morrow A 6300 ft

  11. The Morrow Sandstone Binocular Microscope Image

  12. Dipole Sonic Log – Postle Field

  13. Where is the Sand? • Acoustic impedance contrast between Morrow sandstone and shale is small (<10%). • The Morrow A is a thin sandstone reservoir below seismic resolution. • Average ~45 ft.

  14. 4-D, 9-C Seismic Survey

  15. Field Survey Layout

  16. 4-D, 9-C Seismic Acquisition Parameters Special Thanks to Paragon

  17. Reservoir Characterization Project Phase XII RCP P Stack S11 Stack 800 1500 1050 2000 A 1300 2500 1500 2850

  18. P-Wave Synthetic Seismogram Well 17-6 Correlation: 73% 18

  19. P-Wave Inline 50 - Baseline south north Lateral Scale 2.5 Miles 19

  20. S11-Wave Synthetic Seismogram Well 17-6 Correlation: 72% 20

  21. S11 Inline 50 - Baseline Atoka Morrow Shale Morrow A Lateral Scale 2.5 Miles 21

  22. Postle Seismic Survey

  23. VSP Well Tie P-Wave Corridor STK March 08 in Inline 45 S-Wave Corridor STK March 08 in Inline 45 Tamimi 2009

  24. P-Wave Max Peak Amplitude Pmig4 Band Pass 30,35 Morrow Peak 20 ms Center Correlation: 0.42 Wyllie, 2008

  25. S -Impedance 17840 Correlation Coeff .65 12893

  26. Seismic guided Morrow A Sandstone 14 (ft) Multicomponent guided Isopach .73 CC From Pinto 2011 4000 ft

  27. Final Map Thickness (ft) With 94% correlation to Morrow A thickness of well data. Includes P-P amp, S11 and S22 amplitudes, and time-lapse P-P data From Minaei, 2011

  28. Where is the CO2 Going?

  29. Seismic/Simulation P-Wave: 1st Monitor-Base From Heris 2011 From Zerpa 2011 29

  30. Seismic/Simulation S11-Wave: 1st Monitor-Base From Zerpa 2011 From Heris 2011 30

  31. Revitalization of HMU, Postle Field, OK Seismic Acquisition May 2007 Dec. 2008 March 2008 February 2010 1958 1961 1974 1st Monitor Survey 2nd Monitor Survey Start of CO2 Flood Baseline Survey Discovery Start of Waterflood Start of Production Production history of Postle Field in the RCP area 31 (Modified from Heris, 2011)

  32. Production History & Field Revitalization 3068

  33. Conclusions • The Morrow A Sandstone Reservoir is better imaged with shear waves • Reservoir conformance mapping with shear waves provides the insight to change or adjust the current injection-production pattern to improve CO2 conformance

  34. Reservoir Characterization Project Phase XII RCP Thanks to RCP Sponsors of Phases XII and XIII

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