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EXPLORE

EXPLORE. The Depths of Our Experience. Stratigraphic, Lithologic, and Enrichment Character of the Mahogany Zone Oil Shale in the Eastern Uinta Basin, Utah. International Oil Shale Symposium in Tallinn, Estonia June 10-13, 2013. Presented By: Steven B. Kerr Lindsay M. Schou Peter E. Doumit.

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EXPLORE

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  1. EXPLORE The Depths of Our Experience

  2. Stratigraphic, Lithologic, and Enrichment Character of the Mahogany Zone Oil Shale in the Eastern Uinta Basin, Utah International Oil Shale Symposium in Tallinn, Estonia June 10-13, 2013 Presented By: Steven B. Kerr Lindsay M. Schou Peter E. Doumit

  3. Stratigraphic, Lithologic, and Enrichment Character of the Mahogany Zone Oil Shale in Eastern Utah

  4. Green River Formation Basins

  5. Uinta Basin Oil Shale Operations Regional Map

  6. Regional Setting / Topography

  7. Regional Stratigraphy Mahogany Zone

  8. Historic Generalized Stratigraphy Mahogany Zone • Bracketed by A-Groove and B-Groove • Mahogany Marker and Mahogany Bed specifically identified Mahogany Zone

  9. Mahogany Marker Ash-fall tuff ~0.2 m (0.5 ft) thick. Occurs ~1.5–3 m (5-10 ft) above the Mahogany Bed in lean oil shale. Very consistent and widespread-excellent for correlation.

  10. Richest unit within MZ Prominent cliff-former Mahogany Bed 2.5-4.5 m (8-15 ft thick) Avg. ~200 lit/t (54 gal/t) Easily identifiable in outcrop

  11. Historic Drilling Map

  12. Historical Drilling in the Uinta Basin ~ 300 holes define the Mahogany Zone along the east and southern portions of the Uinta Basin. Holes have been archived by UGS and USGS. • Most records include geology logs and assays. • ~225 holes include down-hole geophysics.

  13. Historical Drilling Data Benefits The majority of the historical records have proven to be reliable. The records are useful in preliminary assessments of new areas. We are able to validate and use much of the historic data in our resource assessment models.

  14. Regional Characteristics – MZ Thickness: Historical Data

  15. Regional Characteristics – Average MZ Oil Grade: Historical Data

  16. Historical Drilling Data Problems Many records are not comprehensive and provide little data. Some of the data is of low quality and without much control. • Knowledge of the basin oil shale was minimal. • Marker beds often not identified. • Little QA/QC.

  17. Historical Drilling Data Problems Cont. Some of the data contains erroneous stratigraphic picks. • Base of the Mahogany Zone picked too early (False B-Groove). • Inconsistent stratigraphic tops picks between different geologists/companies. • Variable FA analysis intervals makes pick validation difficult. *** Use of erroneous/poor/limited data has led to historically inaccurate Mahogany Zone thicknesses and grades.

  18. Norwest Data Synthesis Re-evaluated Stratigraphic Picks • False Marker vs. Mahogany Marker • False B-Groove vs. B-Groove (Below Curly Tuff) • Consistent top picks based on density log signature. Fine-Tuned Assays • Eliminating potentially smeared (cuttings) or vague (>2 ft/sample) data Incorporation of Recent Drilling • ~ 60 Core Holes

  19. Uinta Basin Mahogany Zone Generalized Stratigraphy Mahogany Zone • Thickness: 23-37 m (75-120 ft) • Avg. Richness: • 95 lit/t (25 gal/t) Three Sisters: ~ 85 lit/t (22.5 gal/t) Three Brothers: ~ 96 lit/t (25.5 gal/t) Mahogany Bed: ~ 200 lit/t (54 gal/t) Middle MZ: ~ 114 lit/t (30 gal/t) Lower MZ: ~ 74 lit/t (19.5 gal/t)

  20. Middle R-8 Zone Wavy Tuff Middle R-8 Zone Wavy Tuff Lower R-8 Zone Lower R-8 Zone Three Sisters Three Sisters A-Groove A-Groove Three Brothers Three Brothers Upper Mahogany Zone Upper Mahogany Zone Mahogany Bed Mahogany Bed Middle Mahogany Zone Middle Mahogany Zone False B-Groove False B Lower Mahogany Zone Curly Tuff Lower Mahogany Zone Curly Tuff B-Groove B-Groove

  21. Uinta Basin Mahogany Zone Geophysical Response

  22. Synthesis of Data – MZ Thickness: Historical vs. Combined Data

  23. Synthesis of Data – FA Grade: Historical vs. Combined Data

  24. Summary Historic Generality / Recent Specificity Stratigraphic Details • Recognize the full package • Correlate the density profile New models with corrected historic data and inclusion of recent data reflect the most accurate knowledge of the Uinta Basin’s Mahogany Zone character to date.

  25. Acknowledgements

  26. Norwest Corporation EXPLOREthe Depths of our Experience

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