Shale Gas Resources in US - USGS Report

8/7/2019 Shale Gas Resources in US - USGS Report

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What do we Assess?What do we Assess?

Technically recoverable undiscoveredTechnically recoverable undiscovered

hydrocarbon resourceshydrocarbon resources oil, natural gas, natural gas liquidsoil, natural gas, natural gas liquids


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The Devonian ShaleThe Devonian Shale -- Middle andMiddle andUpper Paleozoic TPSUpper Paleozoic TPS

Conventional Oil and Gas ResourcesConventional Oil and Gas Resources Accumulations in structural, stratigraphic,Accumulations in structural, stratigraphic,

combination traps.combination traps.

Segregation of fluids within reservoirs (Water,Segregation of fluids within reservoirs (Water,

oil, gas cap)oil, gas cap)


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The Devonian ShaleThe Devonian Shale -- Middle andMiddle andUpper Paleozoic TPSUpper Paleozoic TPS

Continuous (unconventional) resourcesContinuous (unconventional) resources

BlanketBlanket--like accumulations, commonly withlike accumulations, commonly with

multimulti--storied reservoirs.storied reservoirs.

Coalbed methane, Radioactive black shales,Coalbed methane, Radioactive black shales,

tight sandstonestight sandstones --


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How do we do it?How do we do it?

Conventional:Conventional: Estimate numbers and sizesEstimate numbers and sizes

of undiscovered fieldsof undiscovered fieldsmaximum,maximum,median, minimum, most likely.median, minimum, most likely.

Continuous (unconventional):Continuous (unconventional): EstimateEstimatenumbers of untested cells (40 acres, 80numbers of untested cells (40 acres, 80

acres, etc.) and the range of theacres, etc.) and the range of the

cumulative production from each cellcumulative production from each cell(max, min, median, mean).(max, min, median, mean).


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The Drake Well: Where it all beganThe Drake Well: Where it all began


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W

E

Acadian

Orogeny

TaconicOrogeny

IapetanEvent

CARTOONOGRAPH ACROSS APPALACHIAN BASIN,ILLUSTRATING MAJOR PETROLEUM SYSTEMS

ImpureSandstone

Sandstone

Siltstone BlackShale

Shale Red beds Limestone Dolomite


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The Devonian ShaleThe Devonian Shale--Middle and UpperMiddle and Upper

Paleozoic TPSPaleozoic TPS


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Extent and thickness of Devonian rocks in theExtent and thickness of Devonian rocks in theAppalachian basinAppalachian basin

(adapted from deWitt and others,1975)(adapted from deWitt and others,1975)

12,000 ft

25 feet


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CatskillCatskill

MagnafaciesMagnafacies

(adapted from Harper, 1999)(adapted from Harper, 1999)


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Extent of Devonian Shale in Eastern U.S.Extent of Devonian Shale in Eastern U.S.Section ASection A--AA (Oliver and others, 1967)(Oliver and others, 1967)


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Cross Section ACross Section A

--

AA

(de Witt and others, 1975)(de Witt and others, 1975)AA


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Oil in Devonian Shale and OriskanyOil in Devonian Shale and Oriskany

SandstoneSandstone


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Greater Big Sandy AUGreater Big Sandy AU


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Devonian Shale ThicknessDevonian Shale Thickness(deWitt and others, 1993)(deWitt and others, 1993)


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Cross Section GCross Section G -- GG(deWitt and others, 1993)(deWitt and others, 1993)


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Relation of NWOS to Regional StructureRelation of NWOS to Regional Structure


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Devonian Siltstone and Shale AUDevonian Siltstone and Shale AU


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Regional Decollement and FoldsRegional Decollement and Folds


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EUR distribution: Greater Big Sandy AU by thirdsEUR distribution: Greater Big Sandy AU by thirds


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EUR distribution: NWOS AU byEUR distribution: NWOS AU by thirdsthirds


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EUR distribution: DSS by ThirdsEUR distribution: DSS by Thirds


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Undiscovered ResourcesUndiscovered Resources


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Per Well Estimates of TechnicallyPer Well Estimates of Technically

Recoverable Gas (DOE EGSP)Recoverable Gas (DOE EGSP)


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Shale Gas Resources in US - USGS Report

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