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U.S. Shale GasU.S. Shale Gas
Resources, Resources, Reserves and $$$Reserves and $$$
John B. CurtisJohn B. CurtisPotential Gas AgencyPotential Gas AgencyColorado School of MinesColorado School of Mines
Location of U.S Shale Gas PlaysLocation of U.S Shale Gas Plays
U.S. Energy Information Agency, March 2010U.S. Energy Information Agency, March 2010
Oil Shale Gas Hydrates
TightGas Sands;
CBM;Gas Shales
TightOil;
Heavy Oil;Bituminous
Sands
Oil Gas
Conventional Reservoirs:Small Volumes,Easy to Develop
Unconventional Reservoirs:Large Volumes,Hard to Develop
Huge Volumes,Difficult
to Develop
Incr
easi
ng P
rodu
ct P
rice
Imp
rovi
ng
Tec
hn
olo
gy
Province Resource Size
The Resource PyramidThe Resource Pyramid
(S. Sonnenberg, CSM)
Shale Gas Annual Production and Energy Shale Gas Annual Production and Energy Information Administration (EIA) ForecastInformation Administration (EIA) Forecast
0
500
1,000
1,500
2,000
2,500
19791981198319851987198919911993199519971999200120032005200720092011201320152017201920212023202520272029
Annual Production, Bcf
CUM
EIA Projection
EnCanaEnCana
Targeted Research – $150 Targeted Research – $150 MillionMillion
Acquisitions – >$50 BillionAcquisitions – >$50 Billion
Source: Trollart.com – Ray TrollSource: Trollart.com – Ray Troll
Resource Development – Resource Development – >$15 Billion>$15 Billion
Source:devonenergy.com
Source:devonenergy.com
Source:AAPG
Source:AAPG
Source:chiefoiland gas.com
Hydrocarbons From Shale – Never Hydrocarbons From Shale – Never Say DieSay Die
Growth in Barnett Shale - Ft. Worth Basin
0
100
200
300
400
500
600
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004
Annual Production, Bcf
0
500
1,000
1,500
2,000
2,500
3,000
3,500
4,000
4,500
5,000
Producing Wells
Gas Production Well Count
Shale Gas Reservoir Mechanisms
U.S. DOE
Exploration ConsiderationsExploration Considerations
• Natural fractures - Friend or Foe?• Facies changes - greater permeability• Kerogen type - I,II,IIS,III• Microbial or thermogenic gas?• Thermal maturation history• MWD - especially w/ gas isotopes
Some Elements of a Successful Some Elements of a Successful Shale Gas PlayShale Gas Play
ProductivityProductivity
Gas-In-PlaceGas-In-PlaceThicknessThickness
Organic RichnessOrganic Richness
MaturationMaturation
BrittlenessBrittleness
MineralogyMineralogy PermeabilityPermeability
Pore Pressure
Pore Pressure
Potential Supply of Potential Supply of Natural Gas in the Natural Gas in the United StatesUnited States
Report of theReport of thePotential Gas CommitteePotential Gas Committee(December 31, 2008)(December 31, 2008)
Regional Resource AssessmentRegional Resource Assessment
Data source: Potential Gas Committee (2009)
Traditional 1,673.4 TcfCoalbed 163.0 TcfTotal U.S. 1,836.4 Tcf
Traditional 1,673.4 TcfCoalbed 163.0 TcfTotal U.S. 1,836.4 Tcf
353.517.3
455.23.4
24.016.6
193.857.0
51.32.6
274.97.5
374.451.9
PGC Resource Assessments, 1990-PGC Resource Assessments, 1990-20082008
Data source: Potential Gas Committee (2009)
Total Potential Gas Resources (mean values)Total Potential Gas Resources (mean values)
Possible Constraints on Future Gas Possible Constraints on Future Gas SupplySupply
Sufficient Supply toMeet Demand
Sufficient Supply toMeet Demand
TechnologyTechnologyResource
BaseResource
Base
EnvironmentalConcerns
EnvironmentalConcerns
Skilled Workforce
Skilled Workforce
Regulatory &Land IssuesRegulatory &Land Issues
Gas PriceGas PricePipelineCapacityPipelineCapacity
Rig Availability
Rig Availability
Potential Gas Agency