overview of coal gas reservoir properties of western
TRANSCRIPT
Overview of Coal Gas Reservoir Properties of Western Interior Research Coreholes
Simon TestaTICORA Geosciences, Inc.
Mid-Continent Coalbed Methane Symposium
November 8, 2004Crowne Plaza Hotel
Tulsa, OK
Do it Right the First Time
The added cost of doing it right the first time is minor when compared to the potential economic consequences of basing important decisions on
insufficient data
Presentation Outline
• Research Project Objectives
• Corehole Location & Reservoir Characteristics
• Regional Relationships
• Compare Carboniferous versus KT
• Potential Gas Productivity
Project Objectives
• Characterize Reservoir Properties of Frontier Areas
Formations from which there has been little or no large-scale commercial coal gas production
• Design & Build Isotherm Equipment
To accurately determine sorption characteristics of Frontier reservoirs - low rank, low gas content, low pressure reservoirs
Study Areas
Forest CityCherokeeArkoma
Raton
WillistonDenverGreat Divide N. Appalachian
Overthrust
Corehole Locations
El Paso372Arkoma
Colt Energy
201Cherokee
El Paso1404Forest City
Co-Op Partner
n = 2
CanisterSamples
n = 197
Core Holes
n = 7
Basin
n = 3
IOWA
NEBRASKA
KANSAS
MISSOURI
OKLAHOMA ARKANSAS
FOREST CITYBASIN
ARKOMABASIN
BOURBON ARCH
CHEROKEEBASIN
FCBCH #1
CH #1-21 CH #2-16
FCBCH #2
FCBCH #3
FCBCH #4
Hinthorn CW #1
FEET
0 500,000
Completions
Reservoir Characteristics
~7 – 12~10~14 – 21NetCoal Thickness
(ft.)
0.95 – 2.30(hvAb to sa)
? - 0.87(? to hvAb)
0.43 – 0.70(Sub B to hvAb)
Max. Vitrinite Reflectance
~16 – 20~ 20~30 – 41NetReservoir
Thickness (ft.)
1.0 - 5.00.1 - 2.50.1 - 3.0SeamThickness (ft.)
71114No. of Seams
Arkoma(n = 2)
Cherokee(n = 1)
Forest City(n = 4)
Parameters
Coal Rank
Forest City BasinType Log &
Nomenclature
0 200GR
2 3RHOB
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
Kansas City Group
Blue JacketDrywood
Rowe*Neutral
Riverton*
L. Cherokee
BevierCroweburg
MineralWeir
U. Cherokee
LexingtonMulberrySummit
Marmaton
HushpuckneyStarkKansas City
Seamsn = 14
Groupn = 3
Marmaton Group
Cherokee Group
1900
Mississippian
Cherokee BasinType Log &
Nomenclature
Mississippian
Marmaton Group
650
Cherokee Group
Mulky*Bevier
CroweburgMineral
ScammonTeboWeir*
Riverton*
Cherokee
LexingtonMulberry
Little Osage
Marmaton
Seamsn = 11
Groupn = 2
Arkoma BasinType Log &
Nomenclature
Upper HartshorneHartshorne*Hartshorne
McAlester #1McAlester #2McAlester #3
McCurtainBooch
McAlester
Seamsn = 7
Formationsn = 2
McAlester Formation
Hartshorne Formation
Gas Content versus Vitrinite Reflectance
R² = 0.9322
0
100
200
300
400
500
600
700
800
900
1,000
0.0 0.5 1.0 1.5 2.0 2.5
Maximum Vitrinite Reflectance, %Ro
Dry
, Ash
-Fre
e G
as C
onte
nt, s
cf/to
n
Forest City Basin Cherokee Basin Arkoma Basin
Peat
Semi-Anthracite
Low Volatile Bituminous
Medium Volatile Bituminous
High Volatile Bituminous
Subbituminous
Lignite
n = 37
Methane Storage versus Vitrinite Reflectance
R2 = 0.942
0
100
200
300
400
500
600
700
800
900
1,000
0.0 0.5 1.0 1.5 2.0 2.5
Maximum Vitrinite Reflectance, %Ro
DAF
Met
hane
Sto
rage
Cap
acity
, scf
/ton
Forest City Basin Cherokee Basin Arkoma Basin
Peat
Semi-Anthracite
Low Volatile Bituminous
Medium Volatile Bituminous
High Volatile Bituminous
Subbituminous
Lignite
n = 13
Sorption Time versus Vitrinite Reflectance
R2 = 0.8162
0
100
200
300
400
500
600
700
800
900
1,000
0.0 0.5 1.0 1.5 2.0 2.5
Maximum Vitrinite Reflectance, %Ro
Sor
ptio
n Ti
me,
hou
rs
Forest City Basin Cherokee Basin Arkoma Basin Power (Best-fit Line)
Peat
Semi-Anthracite
Low Volatile Bituminous
Medium Volatile Bituminous
High Volatile Bituminous
Subbituminous
Lignite
Reservoir Property ComparisonTertiary-Cretaceous vs. Carboniferous
Hours
scf/ton
Feet
-
-
Units
41351655Sorption Time
5615742224In-Situ Gas Content
3,1482,3986211,123Depth
hvAbSemi-AnthraciteSub CSub BRank
FruitlandHartshorneCanyonBevierSeam
San Juan Basin
Arkoma Basin
Powder River Basin
Forest City BasinParameters
Potential Gas Productivity
• Seam Thickness (bulk ρ log or core)• Gas Content (core analysis)• Gas Storage Capacity (core analysis)• Sorption Time (core analysis)• Relative Permeability (core analysis or
published)• Initial Pressure (well test)• Absolute Permeability (well test)
Fracture Permeability
51 md10 md2.0 mdForest City
32 md10 md3.0 mdArkoma
40 md10 md2.3 mdCherokee
Intermediate Case
Best Case
Worst CaseBasin
Assumptions
Lower CherokeeForest City BasinPeak Gas Rate - 51.1 Mscf/DCumulative Gas (10 years) – 110 MMscfRecovery Factor - 37%
Lower CherokeeCherokee Basin Peak Gas Rate - 61 Mscf/DCumulative Gas (10 years) – 182 MMscfRecovery Factor - 29 %
HartshorneArkoma BasinPeak Gas Rate - 266 Mscf/DCumulative Gas (10 years) – 280 MMscfRecovery Factor – 67 %
Hartshorne Production DataVertical versus
Horizontal
Source: OGS (1988 to early 2004)
158178762341Horizontal455NA1652Vertical
Haskell
13185746139Horizontal276NA1836Vertical
LaFlore
75198049460Horizontal113NA997Vertical
Pittsburg
feetSTB/dayMscf/day
Number of Wells
Lateral LengthInitial Water Production
Initial Gas Production
CompletionType
County
Summary• This project offered a unique opportunity to evaluate
reservoir properties over a large geographic area and a wide rank range
• General trends across the Forest City, Cherokee, and Arkoma Basins were observed
• Gas storage and movement characteristics become more favorable with increasing rank
• There appears to be a better opportunity to encounter higher initial gas saturations in the higher rank coals
• To obtain similar reservoir properties the older WICR reservoirs must be of a higher rank than the younger RM reservoirs
• The potential gas productivity estimates would have been vastly improved with the measurement of permeability and pressure data
• DO IT RIGHT THE FIRST TIME
IOWA
NEBRASKA
KANSAS
MISSOURI
OKLAHOMA ARKANSAS
FOREST CITYBASIN
ARKOMABASIN
BOURBON ARCH
CHEROKEEBASIN
FCBCH #1
CH #1-21 CH #2-16
FCBCH #2
FCBCH #3
FCBCH #4
Hinthorn CW #1
FEET
0 500,000
Corehole LocationInformation
S21 T17N R20EOklahomaLeFloreEl PasoCore Hole #1-21
S16 T6N R25EOklahomaHaskellEl PasoCore Hole #2-16Arkoma
S14 T32S R16E KansasMontgomeryColt EnergyHinthorn #CW1Cherokee
S34 T6S R14EKansasJacksonEl PasoFCB Core Hole #4
S35 T15S R14EKansasOsageEl PasoFCB Core Hole #3
S6 T3S R21EKansasDoniphanEl PasoFCB Core Hole #2
S26 T54N R37WMissouriPlatteEl PasoFCB Core Hole #1
Forest City
LocationStateCountyOperatorCore Hole NamesBasin