Petrophysical property modeling of Umiat Field, a frozen oil reservoir

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Author
Levi-Johnson, Obioma I.
Chair
Hanks, C. L.
Mongrain, J.
Committee
McCarthy, P. J.
Dandekar, A.
Metadata
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URI
http://hdl.handle.net/11122/7354
Abstract
Umiat field, a frozen oil reservoir, is situated in the folded and thrust-faulted Cretaceous sedimentary rocks at the leading edge of the Brooks Range foothills of northern Alaska. The main oil reservoirs are between 500-1400 feet deep and in permafrost. The main oil-producing zones in the Umiat field are the Grandstand shoreface sandstones. Statistical analyses of the porosity and permeability of the Upper and Lower sands indicate that the sands have distinct petrophysical characteristics. A plot of cumulative flow capacity versus cumulative storage capacity (i.e. Modified Lorenz Plot) defined the flow structures of the Upper and Lower sands in Umiat well # 9. The observed heterogeneities can be correlated with very fine-grained sediments observed in the conventional core of the interval. A petrophysical property model of Umiat field was built consistent with the existing data and geologic knowledge about the reservoir. This model will be used in the future to test various production strategies for Umiat field. Based on this model, the estimated oil in place is 1.2 billion stock tank barrels and the associated gas is 84 billion standard cubic feet.
Description
Thesis (M.S.) University of Alaska Fairbanks, 2010
Table of Contents
1. Introduction -- 1.1. Location of Umiat field -- 1.2. Limitations in the development of Umiat field -- 1.3. Production strategies of Umiat field -- 1.4. Objectives of study -- 1.5. Source of data -- 2. Geologic setting of Umiat field -- 2.1. Nanushuk Formation -- 2.11. The Grandstand sands -- 2.12. The chandler sand -- 2.2. Umiat field structuree -- 2.3. Oil source and petroleum system of Umiat field -- 3. Development history of Umiat field -- 3.1. Reservoir characteristics of the Nanushuk Formation -- 3.2. Productivity of the Umiat test wells -- 4. Stastical analyses of the Grandstand sands -- 4.1. Summary statistics -- 4.2. Comparison of the Lower and Upper sands based on cross plots -- 4.3. Histograms -- 4.4. Box plots -- 4.5. T-tests -- 4.6. Comparison of the Upper and Lower sands based on porosity and permeability cut-offs -- 4.7. Modified Lorenz plot -- 5. Petrophysical property modeling of Umiat field -- 5.1. Step by step Procedure of building Umiat petrophysical property model -- 5.11. Setting up the coordinate system and units -- 5.12. Defining the stratigraphic framework -- 5.13. Importing horizon and fault data -- 5.14. Fault modeling -- 5.15. Creating the model boundary -- 5.16. Horizon modeling -- 5.17. Importing well data -- 5.18. Creating the lithofacies logs -- 5.19. Creating the zone logs -- 5.2. Grid generation -- 5.21. Gridding parameters -- 5.3. Creating the blocked wells -- 5.4. Indicator grid modeling -- 5.5. Petrophysical property modeling -- 6. Volumetric calculation -- 6.1. Estimation of stock tank oil initially in place and associated gas -- 6.11. Previous estimates -- 6.12. Estimates from this study -- 6.2. Results -- 7. Results and discussion -- 7.1. Statistical analyses -- 7.2. Petrophysical property modeling -- 7.3. Uncertainties in the petrophysical property modeling and OOIP calculation -- 8. Conclusion and recommendations -- 8.1. Conclusion -- 8.2. Recommendations -- References -- Appendix A -- Appendix B.
Date
2010-08
Type
Thesis
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