Reservoir Quality of Tertiary & Mesozoic Sandstones, Bristol Bay Basin, AlaskaReservoir Quality of Tertiary & Mesozoic Sandstones, Bristol Bay Basin, Alaska

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Sedimentary Basins of AlaskaSedimentary Basins of Alaska

Tertiary and Mesozoic StratigraphyTertiary and Mesozoic Stratigraphy

Proposed Area of 2005 Lease SaleProposed Area of 2005 Lease Sale

Bristol Bay

ARCO N. Aleutian COST #19957.5’ MD; Stepovak Fm.Φ = 17.2%; K = 0.87 md

Amoco Becharof State #17915.0’ MD; Stepovak Fm.Φ = 7.1 %; K = 0.12 md

OutcropHerendeen Fm.Φ = 4.6 %; K = 0.004 md

ARCO N. Aleutian COST #18635.0’ MD; Stepovak Fm.Φ = 31.4 %; K = 709 md

ARCO N. Aleutian COST #18087.0’ MD; Stepovak Fm.Φ = 32.9 %; K = 2358 md

ARCO N. Aleutian COST #15234.0’ MD; Unga Fm.Φ = 34.2 %; K = 1607 md

ARCO N. Aleutian COST #14198.0’ MD; Bear Lake Fm.Φ = 33.7 %; K = 18 md

ARCO N. Aleutian COST #14197.0’ MD; Bear Lake Fm.Φ = 35.6 %; K = 16 md

Amoco Becharof State #12734.5’ MD; Milky River Fm.Φ = 36.9 %; K = 3470 md

Amoco Becharof State #12726.5’ MD; Milky River Fm.Φ = 43.2 %; K = 2040 md

OutcropTolstoi Fm.Φ = 7.0 %; K = 0.005 md

OutcropNaknek Fm.Φ = 6.3 %; K = 3.38 md

OutcropShelikof Fm.Φ = 3.6 %; K = 0.01 md

OutcropKialagvik Fm.Φ = 9.7 %; K = 0.005 md

Kenneth P. HelmoldState of AlaskaDepartment of Natural ResourcesDivision of Oil and Gas550 West 7th Avenue, Suite 800Anchorage, AK 99501-3560907-269-8673kph@dnr.state.ak.us

Donald W. BrizzolaraDonald W. BrizzolaraState of AlaskaState of AlaskaDepartment of Natural ResourcesDepartment of Natural ResourcesDivision of Oil and GasDivision of Oil and Gas550 West 7550 West 7thth Avenue, Suite 800Avenue, Suite 800Anchorage, AK 99501Anchorage, AK 99501--35603560907907--269269--87688768dwb@dnr.state.ak.usdwb@dnr.state.ak.us

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ReservoirSandstones

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Porosity/Permeability vs Depth

Reservoir Sandstones• High quality in Mio/Pliocene• Minor cementation and compaction• Fine grained to conglomeratic• High to moderate quartz component• Low Dmax

Non-reservoir Sandstones• Mostly Eocene and older• High volcanic component• Arkosic composition• Zeolite cementation• Severe compaction• High Dmax

Becharof #1