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2006 Oil and Gas Assessment of North Aleutian Basin Planning Area

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2006 Oil and Gas Assessment of North Aleutian Basin Planning Area North Aleutian Basin OCS Planning Area Assessment of Undiscovered Technically-Recoverable Oil and Gas As of 2006 U.S. Department of the Interior Minerals Management Service Alaska OCS Region Anchorage, Alaska Kirk W. Sherwood John Larson C. Drew Comer James D. Craig Cameron Reitmeier February 2006 This report is available online at http://www.mms.gov/alaska/re/reports/rereport.htm. A Compact Disk version of the report (in PDF format) may be obtained by contacting Rance Wall, Regional Supervisor for Resource Evaluation, Minerals Management Service, Centerpoint Financial Center, 3801 Centerpoint Drive, Suite 500, MS 8100, Anchorage, AK 99503-5823, or at Ph. 907-334-5320, or at e-mail [email protected] Table of Contents List of Text Topics Summary, page 1 Source Potential of Coal-Bearing Rocks, page 23 Location and General Geology of North Source Potential of “Amorphous” Aleutian Basin OCS Planning Area, Interval, 15,620-17,155 ft bkb, page 5 page 24 Source Potential of Tertiary Basin Exploration History of North Aleutian Fill and Assessment Model, page Basin, page 6 26 Past Exploration Onshore, page 6 Oil and Gas Occurrences and Leasing Onshore, page 6 Biomarker Correlations, page 26 Offshore/OCS Exploration, page 7 Petroleum System—Critical Events, Past OCS Leasing, page 7 page 31 Productive Analog Basin—Cook Inlet Petroleum System Elements and Oil and Basin, page 8 Gas Plays in North Aleutian Basin OCS Planning Area, page 37 Petroleum Geology of the North Aleutian Key Elements of Petroleum System, Basin, page 9 page 37 Regional Geology, page 9 Play Definition, page 37 Alaska Peninsula, page 9 Play Descriptions, North Aleutian Basin, Formation of North Aleutian Basin, Alaska, page 38 page 10 Play 1: Bear Lake-Stepovak Structures of Amak Basin, Black Hills (Oligocene-Miocene), page 38 Uplift, and North Aleutian Basin, Play 2: Tolstoi (Eocene-Oligocene), page 11 page 39 Nature of Basement Beneath North Play 3: Black Hills Uplift-Amak Aleutian Basin, page 13 Basin (Eocene-Miocene), page 41 Mesozoic Stratigraphy and Reservoir Play 4: Milky River Biogenic Gas Formations, page 15 (Plio-Pleistocene), page 43 Cenozoic Stratigraphy, Reservoir Play 5: Mesozoic Deformed Formations, and Play Sequences, page Sedimentary Rocks (Triassic- 16 Cretaceous), page 45 Petroleum Systems in North Aleutian Play 6: Mesozoic Buried Granitic Basin Plays, page 19 Hills (Jurassic-Cretaceous Thermal Maturity of North Aleutian Magmatic Rocks), page 47 Basin Fill, page 19 Source Rock Potential, page 21 Geologic Assessment Model, page 50 Mesozoic Source Rocks, page 21 Prospect Areas and Volumes, page 50 Tertiary Source Rocks, page 22 Prospect Numbers, page 51 i Pay Thickness Model, page 52 Play 4: Milky River Biogenic Gas (Plio- Construction of Probability Distributions Pleistocene), page 59 with Limited Data, page 53 Play 5: Mesozoic Deformed Computation of Oil and Gas Recovery Sedimentary Rocks (Triassic- Factors, page 54 Cretaceous), page 59 Oil Recovery Factor, page 54 Play 6: Mesozoic Buried Granitic Hills Gas Recovery Factor, page 54 (Jurassic-Cretaceous Magmatic Risk Assessment, page 56 Rocks), page 60 Overall Results for Oil and Gas Assessment Results for North Aleutian Endowments of North Aleutian Basin, Basin, page 57 page 61 Play 1: Bear Lake-Stepovak (Oligocene- Large Individual Gas Fields Are Miocene), page 57 Possible, page 61 Play 2: Tolstoi (Eocene-Oligocene), Economic Potential of North Aleutian page 58 Basin, page 62 Play 3: Black Hills Uplift-Amak Basin (Eocene-Miocene), page 59 References Cited, page 64 List of Tables 1. North Aleutian Basin and Alaska 7. Input Data for Play 5, Mesozoic Peninsula Exploration Wells, 1903- Deformed Sedimentary Rocks (Triassic- 1985, page 71 Cretaceous), page 77 2. Selected Extract Data, Oil and Gas Show 8. Input Data for Play 6, Mesozoic Buried Interval, North Aleutian Shelf COST 1 Granitic Hills (Jurassic-Cretaceous well, page 72 Magmatic Rocks), page 78 3. Input Data for Play 1, Bear Lake- 9. Input Data for Oil and Gas Recovery Stepovak (Oligocene- Miocene), page Factor Calculation, Play 1, Bear Lake- 73 Stepovak (Oligocene- Miocene), page 79 4. Input Data for Play 2, Tolstoi (Eocene- Oligocene), page 74 10. Input Data for Oil and Gas Recovery Factor Calculation, Play 2, Tolstoi 5. Input Data for Play 3, Black Hills Uplift- (Eocene-Oligocene), page 80 Amak Basin (Eocene-Miocene), page 75 11. Input Data for Oil and Gas Recovery 6. Input Data for Play 4, Milky River Factor Calculation, Play 3, Black Hills Biogenic Gas (Plio-Pleistocene), page Uplift-Amak Basin (Eocene-Miocene), 76 page 81 ii 12. Input Data for Oil and Gas Recovery Pool Size Simulation Statistics for Play 3 Factor Calculation, Play 5, Mesozoic – Black Hills Uplift-Amak Basin Deformed Sedimentary Rocks (Triassic- (Eocene-Miocene), page 87 Cretaceous), page 82 20. Conditional (Un-risked) Recoverable 13. Input Data for Oil and Gas Recovery Sizes of Ranked Pools for Play 3 – Black Factor Calculation, Play 6, Mesozoic Hills Uplift-Amak Basin (Eocene- Buried Granitic Hills (Jurassic- Miocene), page 87 Cretaceous Magmatic Rocks), page 83 21. Conditional (Un-risked) Recoverable 14. 2006 Assessment Results for North Pool Size Simulation Statistics for Play 5 Aleutian Basin OCS Planning Area, page 84 – Mesozoic Deformed Sedimentary Rocks (Triassic-Cretaceous), page 88 15. Conditional (Un-risked) Recoverable Pool Size Simulation Statistics for Play 1 22. Conditional (Un-risked) Recoverable – Bear Lake-Stepovak (Oligocene- Sizes of Ranked Pools for Play 5 – Miocene), page 85 Mesozoic Deformed Sedimentary Rocks (Triassic-Cretaceous), page 88 16. Conditional (Un-risked) Recoverable Sizes of Ranked Pools for Play 1 – Bear 23. Conditional (Un-risked) Recoverable Lake-Stepovak (Oligocene-Miocene), Pool Size Simulation Statistics for Play 6 page 85 – Mesozoic Granitic Buried Hills (Jurassic-Cretaceous), page 89 17. Conditional (Un-risked) Recoverable Pool Size Simulation Statistics for Play 2 24. Conditional (Un-risked) Recoverable – Tolstoi (Eocene-Oligocene), page 86 Sizes of Ranked Pools for Play 6 – Mesozoic Granitic Buried Hills 18. Conditional (Un-risked) Recoverable (Jurassic-Cretaceous), page 89 Sizes of Ranked Pools for Play 2 - Tolstoi (Eocene-Oligocene), page 86 25. 2006 Economic Assessment Results for North Aleutian Basin OCS Planning 19. Conditional (Un-risked) Recoverable Area, page 90 List of Figures 1. Location map for North Aleutian basin with well control, Sale 92 (1988) leases, and other Tertiary-age basins of the and regional distribution of Tertiary-age Bering shelf, Pacific margin, and sedimentary rocks, page 92 southern Chukchi Sea, page 91 3. Seismic data coverage (CDP, Two- 2. Regional map for North Aleutian basin, Dimensional) for North Aleutian Basin iii OCS Planning Area, page 93 available as plate 3 4. Regional distribution of Mesozoic 11. Statistical summaries for sandstone bed sedimentary basin containing strata thicknesses for North Aleutian basin correlative to Middle Jurassic oil source play sequences, page 101 rocks that generated 1.4 billion barrels of oil reserves in the oil fields of northern 12. Core porosity versus depth in the North Cook Inlet basin, page 94 Aleutian Shelf COST 1 well, with linear regression function for porosity decline 5. Principal geologic structures of the with depth, page 102 North Aleutian basin and contiguous areas, including: 1) transtensional faults 13. Core porosity versus permeability for and basement uplifts in western parts of sandstones, North Aleutian Shelf COST the basin; 2) wrench-fault structures 1 well, with correlation, page 103 along the Black Hills uplift; and 3) fold/thrust belts along the southeast 14. Core permeability versus depth for margin of the basin, page 95 sandstones, North Aleutian Shelf COST 1 well, with function for permeability 6. Seismic profile through basement uplifts decline with depth, page 104 in western North Aleutian basin, showing Tertiary sedimentary sequences 15. Porosity histograms for Bear Lake- and basin structures, page 96. An Stepovak, Upper Tolstoi, and Lower undistorted Adobe Acrobat version of Tolstoi play sequences, page 105 figure 6 is available as plate 1 16. Permeability histograms for Bear Lake- 7. Magnetic intensity map with offshore Stepovak, Upper Tolstoi, and Lower speculative extrapolation of the Bruin Tolstoi play sequences, page 106 Bay fault, page 97 17. Vitrinite reflectance data for 94 samples 8. Mesozoic stratigraphy, Alaska Peninsula of cuttings, conventional cores, and and substrate beneath southwest part of percussion sidewall cores in the North North Aleutian basin, page 98 Aleutian Shelf COST 1 well, with statistical fits and forecasts for depths of 9. Wellbore stratigraphy, North Aleutian important isograds, page 107 Shelf COST 1 stratigraphic test well, page 99. An undistorted Adobe Acrobat 18. Depth to top of oil generation zone version of figure 9 is available as plate (0.6% vitrinite reflectance) with 2. probable areas of thermal maturity of Tertiary rocks sufficient for oil 10. Regional stratigraphic correlation, generation in and beneath the North Tertiary sequence in North Aleutian Aleutian basin, page 108 Shelf COST 1, Sandy River 1, Port Heiden 1, Ugashik 1, and Becharof Lake 19. Isopach map for thickness of Tertiary- 1 wells, North Aleutian basin and Alaska age rocks within oil generation zone Peninsula, page 100. An undistorted (0.6% to 1.35% vitrinite reflectance) Adobe Acrobat version of figure 10 is with probable areas of thermal maturity iv sufficient for oil generation within and 26. Histograms for Pristane/Phytane
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