Powder River Basin Coalbed Methane Development and Produced

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A series of Wasatch Formation coals exist on the western edge of the basin and include the Cameron, Felix and Ucross seams. These coals coalesce into a thick coal package at Lake Desmet. 2.4 Major Coal Seams The coals are exposed along the eastern edge of the basin where they are surface mined. The thickest exposed unit of coal along the east-central portion of the basin is the Wyodak seam, containing several individual coal units. As shown on Figure 2-7, the Wyodak seam splits into several thinner coal seams, such as the Anderson and Canyon, toward the basin center as well as to the north and south. Figure 2-8 provides a log of the major coals of the Upper Tongue River unit in the east-central portion of the basin. A series of informal names have been assigned to the coals in the Powder River Basin, creating stratigraphic uncertainty. The Basin Study strives to use a consistent set of coal seam terminology, following the extensive stratigraphic work by Goolsby, Finley and Associates. The distribution and correlation of the coals in the Powder River Basin is shown in Figure 2-9, an east-west cross section of the basin. 2.5 Key Reservoir Properties A series of reservoir properties, including depth, coal thickness, gas content, pressure gradient and gas saturation, were collected and assessed to calculate the gas in-place for each of the major coals in each of the 12 basin partitions. In addition, data on coal fracture and matrix porosity was established to calculate the volume of water in-place for each of the coals. Finally, coal reservoir permeability (for both the cleat system and the coal matrix) was established to calculate the amounts of recoverable methane and water. 2.5.1 Coal Seam Depth Coal depth data from completed wells and from previous studies were used to build the coal depth data base for the Powder River Basin. Information on the depth of individual coal seams is provided in Chapter 6. Shown below is data on coal depth for basin Partition #4. Table 2-1. Partition #4 Coal Depth Coal Seam Avg. Depth (ft)* Depth Range (ft)* Anderson 450 300-650 Canyon 540 300-800 Wyodak 600 330-750 Cook 790 600-930 Wall 1,020 800-1,250 Pawnee 1,300 1,150-1,500 Cache 1,500 1,150-1,750 * Top of coal 2-6
PALEOCENE EOCENE Source: Modified from Randall (1989) FELIX UCROSS ANDERSON (LOCAL) CANYON COOK (LOCAL) WALL U. PAWNEE L. PAWNEE CACHE 2-7 WASATCH FT. UNION 0 0 15 50 30 100 61 200 122 400 Meters Feet Figure 2-7. Simplified Representation of Fort Union Coalbeds Near Gillette, in Campbell County, Wyoming WYODAK
Page 1 and 2: DOE/NETL-2003/1184 POWDER RIVER BAS
Page 3: Powder River Basin Coalbed Methane
Page 6 and 7: estimates for the Powder River Basi
Page 9: TECHNICAL PREFACE Coalbed methane r
Page 12 and 13: Figures TABLE OF CONTENTS (Continue
Page 14 and 15: TABLE OF CONTENTS (Continued) Figur
Page 16 and 17: TABLE OF CONTENTS (Continued) Table
Page 18 and 19: TABLE OF CONTENTS (Continued) Table
Page 20 and 21: Economic Conditions Table S-1. Volu
Page 22 and 23: 1.0 STUDY PURPOSE, APPROACH AND FIN
Page 24 and 25: Barrels Water/Mcf Gas 4 3 2 1 0 2.8
Page 26 and 27: N 87W 6S 36 E 6S 37 E 6S 38 E 6S 39
Page 28 and 29: Figure 1-7. Extent of CBM Drilling
Page 30 and 31: 1.4 Study Approach 1.4.1 Coal Resou
Page 32 and 33: Table 1-1. Reports and Data for Pow
Page 34 and 35: 1.4.3 Basic Cost and Economic Model
Page 36 and 37: Table 1-5. Volumes of CBM Produced
Page 38 and 39: Table 1-9. Loss of Capital Investme
Page 40 and 41: The bulk of coalbed methane activit
Page 42 and 43: Source: Montgomery, 1999. Figure 2-
Page 46 and 47: Anderson Canyon Cook Split Cook Fig
Page 48 and 49: Information on thickness of individ
Page 50 and 51: Reservoir Pressure, psia 1100 1000
Page 52 and 53: Overall, the study established that
Page 54 and 55: Table 2-4. Key Reservoir Properties
Page 56 and 57: Table 3-1. Gas In-Place for Major P
Page 58 and 59: Coal Seam Table 3-3. In-Place and T
Page 60 and 61: Table 3-7. In-Place and Technically
Page 62 and 63: Coal Seam Table 3-11. In-Place and
Page 64 and 65: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1
Page 66 and 67: 1 2 3 4 5 6 7 8 9 10 11 12 Major Se
Page 68 and 69: The basic capital costs for the abo
Page 70 and 71: • Infiltration impoundment with e
Page 72 and 73: Table 4-4. Sample Tangible and Inta
Page 74 and 75: • Well pads are placed on 80-acre
Page 76 and 77: The annual cost for pump replacemen
Page 78 and 79: Chapter 3. For capital and O&M cost
Page 80 and 81: 5.3 Costs of Water Disposal Alterna
Page 82 and 83: 5.4 Discussion of Water Disposal Ca
Page 84 and 85: and a select number of injection pr
Page 86 and 87: Table 5-7. Annual Operating Costs f
Page 88 and 89: 5-12
Page 90 and 91: Figure 6-1. Partition #1 Base Map 6
Page 92 and 93: • A series of coal mines exist in
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Production (Mcf/mo.; Barrel/mo.) 6,
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Type Well Well Depth (ft) Table 6-3
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Coal Seam Table 6-7. In-Place and T
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Figure 6-6. Partition #12 Base Map
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Gas and Water Production Rate (Mcfd
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Figure 6-9. Partition #4 Base Map 6
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Figure 6-10. Partition #4 Sample Lo
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Figure 6-11. Partition #4 Anderson
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Figure 6-14. Partition #4 Canyon We
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25,000 20,000 15,000 10,000 5,000 0
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• Wall. The Wall seam defines the
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Production (Mcf/mo.; Barrel/mo.) 35
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- Development. Figure 6-24 provides
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Figure 6-25. Partition #4 Cache Wel
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- Type Well. After adjustment for d
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Production(Mcf/mo.; Barrel/mo.) 30,
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Production(Mcf/mo.; Barrel/mo.) 40,
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- Area. The Wyodak coal seam meets
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- Type Well. The history-matched Co
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- Type Well. The history-matched Pa
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• Partition #5 contains 12 major
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- Development. A small number of Uc
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High 1,600 50 0.27 190 Low 1,740 20
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- Coal Depth. The depth to the top
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- Coal Depth. The depth to the top
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Table 6-55. In-Place and Technicall
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- Development. The are a total of 6
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Production (Mcf/mo.; Barrel/mo.) 7,
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- Type Well. The history-matched Ca
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- Time Zero Well. The time zero plo
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6.9 Partition #9 6.9.1 Summary Part
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- Development. The Dietz #2 seam is
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- Time Zero Plot. The time zero plo
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INTRODUCTION APPENDIX A GAS SORPTIO
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Figure A-1. Gas Content Isotherm Us
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Source: Bustin and Downey (2002) Fi
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Gas Production Rate (Mcfd) 400 350
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• The shallow coals were assumed
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Powder River Basin Coalbed Methane Development and Produced

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