overview of coal gas reservoir properties of western

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


DAF

Met

hane

Sto

rage

Cap

acity

, scf

/ton

Forest City Basin Cherokee Basin Arkoma Basin

Peat

Semi-Anthracite




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


Sor

ptio

n Ti

me,

hou

rs

Forest City Basin Cherokee Basin Arkoma Basin Power (Best-fit Line)

Peat

Semi-Anthracite




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


LaFlore


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

overview of coal gas reservoir properties of western

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