Abstract/Details

Sequence-stratigraphic controls on reservoir-scale architecture of the middle Mesaverde Group, Douglas Creek Arch, Colorado


2011 2011

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Abstract (summary)

The middle Mesaverde Group of the Douglas Creek Arch, northwestern Colorado, is represented by a complex succession of fluvial to marine strata that serve as outcrop analogs to laterally equivalent natural gas reservoirs in the Piceance and Uinta basins. The relatively low net-to-gross (N:G) (<50% sandstone) interval includes ~380 ft (~115.9 m) of mudrock, coal, and sandstone within the lower (Kmvl) to main coal-bearing (Kmvc) intervals of the Mesaverde Group (equivalent to the upper Iles and lower Williams Fork formations).

Based on 2,488 ft (758.5 m) of measured section, facies associations include: (1) coastal plain; (2) estuarine; (3) lagoon; and (4) shallow marine. Nine architectural elements are identified and include: (1) channel bodies; (2) crevasse splays; (3) discrete flood bodies; (4) a bayhead delta; (5) an estuarine assemblage; (6) foreshores; (7) tidal barforms; (8) middle shorefaces; and (9) washover fans. Based on 480 paleocurrent values from sedimentary structures, the vector-mean azimuth is approximately 130°. The stratigraphic study interval reveals two depositional sequences, which record a retrogradation followed by a progradation. Based on 38 sandstone-body measurements, channel bodies have an apparent width (W) of 287.7 ft (87.7 m), and thickness (T) of 4.1 ft (1.3 m) and are larger than crevasse splays (W=90.5 ft [28.0 m]; T= 1.8 ft [0.5 m]) and discrete flood bodies (W=61.5 ft [18.8 m]; T=2.0 ft [0.6 m]). Facies, facies associations, and architectural elements are more diverse in the study interval (Kmvl-lower Kmvc) as compared to previous studies completed in Coal Canyon, Colorado. Sandstone bodies are larger in Coal Canyon by almost 50%. Based on thin section analysis, the relative reservoir qualities of foreshore and middle shoreface architectural elements are good to excellent. Net-to-gross ratios (N:G) in the stratigraphic study interval show direct ties to the sequence-stratigraphic framework and provide a predictive tool for subsurface reservoir characterization. High N:G ratios lie above sequence boundaries within the early lowstand systems tract and fine upward. Low N:G ratios are present within the late lowstand systems tract. Moderate N:G ratios are present within the transgressive and early highstand systems tracts.

Indexing (details)


Subject
Geology;
Petroleum Geology;
Sedimentary Geology
Classification
0372: Geology
0583: Petroleum Geology
0594: Sedimentary Geology
Identifier / keyword
Earth sciences; Architectural elements; Douglas Creek Arch; Piceance Basin; Sandstone bodies; Sedimentology; Sequence stratigraphy
Title
Sequence-stratigraphic controls on reservoir-scale architecture of the middle Mesaverde Group, Douglas Creek Arch, Colorado
Author
Hlava, Kimberly Sue
Number of pages
331
Publication year
2011
Degree date
2011
School code
0051
Source
MAI 50/04M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781267127822
Advisor
Pranter, Matthew J.
Committee member
Cole, Rex D.; Gustason, Edmund R., III
University/institution
University of Colorado at Boulder
Department
Geology
University location
United States -- Colorado
Degree
M.S.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1505449
ProQuest document ID
918691909
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/918691909
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