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You searched for subject:(Duperow Formation). Showing records 1 – 2 of 2 total matches.

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1. Shurtliff, Kyle D. 3-D Geocellular Model Of The Duperow Formation In Southwestern North Dakota.

Degree: MS, Geology, 2015, University of North Dakota

ABSTRACT The Duperow Formation of southwestern North Dakota is Devonian in age, and forms the lower part of the Jefferson Group within the Kaskaskia Sequence. This shallow marine shelf deposit is a cyclical carbonate evaporite, and is comprised of dolomitic mudstones, gypsum, multiple bioclastic wackestones/packstones, stromatoporoid boundstone and anhydrite. There is a long history of oil production in this formation dating back to the 1950’s in North Dakota. By 1989, the Duperow Formation was the second most prolific hydrocarbon producer on the Billings Anticline in North Dakota, and therefore was studied extensively. Environmental factors during deposition as well as diagenetic processes after deposition allowed for hydrocarbon accumulation in pore spaces. As technology advanced and unconventional plays developed, small pay and traditional reservoirs, like the Duperow, were not as profitable, and because of that very little research was done on the Duperow in North Dakota 1989. The well-established cycles of the lower Duperow Formation allow for correlation of wells and cycles across the basin. Two of these cycles at the base of the Duperow have enhanced porosity and definite permeability in locations where dolomitization has occurred and stromatoporoid banks accumulated. Dolomitization of limestone increase the porosity of the rock as the dolomite crystals take their shape as rhombohedrals. Stromatoporoid banks keep some of its pore space and permeability as it is fossilized making it suitable to be a reservoir. These cycles are shown to be continuous beyond the slopes of the anticline. The creation of a 3-D geocellular model shows the extent of the porosity and permeability throughout the study area. Advisors/Committee Members: Richard D. LeFever.

Subjects/Keywords: 3-D Model; Duperow Formation; Stratigraphy

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APA (6th Edition):

Shurtliff, K. D. (2015). 3-D Geocellular Model Of The Duperow Formation In Southwestern North Dakota. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/1964

Chicago Manual of Style (16th Edition):

Shurtliff, Kyle D. “3-D Geocellular Model Of The Duperow Formation In Southwestern North Dakota.” 2015. Masters Thesis, University of North Dakota. Accessed March 02, 2021. https://commons.und.edu/theses/1964.

MLA Handbook (7th Edition):

Shurtliff, Kyle D. “3-D Geocellular Model Of The Duperow Formation In Southwestern North Dakota.” 2015. Web. 02 Mar 2021.

Vancouver:

Shurtliff KD. 3-D Geocellular Model Of The Duperow Formation In Southwestern North Dakota. [Internet] [Masters thesis]. University of North Dakota; 2015. [cited 2021 Mar 02]. Available from: https://commons.und.edu/theses/1964.

Council of Science Editors:

Shurtliff KD. 3-D Geocellular Model Of The Duperow Formation In Southwestern North Dakota. [Masters Thesis]. University of North Dakota; 2015. Available from: https://commons.und.edu/theses/1964

2. Alcorn, Zachary P. Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota.

Degree: MS, Geology, 2014, University of North Dakota

The Duperow Formation of northwestern North Dakota is a cyclical carbonate evaporite unit deposited on a shallow marine shelf during the early part of the Late Devonian (Frasnian). The formation forms the lower part of the Jefferson Group and lithostratigraphic review permits three informal members to be recognized: lower, middle, and upper. Petrographic, lithologic, and well log examination of drill cores and thin sections allows the identification of seven lithofacies within the three members. Lithofacies include; bioclastic wackestone/packstone (LF1), stromatoporoid boundstone/floatstone (LF2), Amphipora boundstone/floatstone (LF3), peloidal wackestone (LF4), dolomitic mudstone (LF5), microbially laminated dolowackestone (LF6), and anhydrite (Lf7). Lithofacies are further grouped into five lithofacies associations (LFA I to LFA V) which correspond to five depositional settings during accumulation of Duperow strata. Lithofacies were deposited within normal marine subtidal, stromatoporoid bank or mound, intertidal slightly restricted, intertidal more restricted, and supratidal conditions. Rocks of the Duperow were typically deposited in a transition from subtidal to supratidal environments, preserving several shallowing upward successions. Nine short term (1-2 million years) third order cycles are recorded by the rocks of the Duperow which represent two transgressive phases and one regressive phase. Diagenetic features within the Duperow enhance porosity and establish units with appreciable amounts of reservoir characteristics. The main diagenetic features observed are micrite enveloping and micritization, calcite cementation, dolomitization, compaction, dissolution, and anhydrite cementation. Only dolomitization and dissolution increase porosity in the rocks of the Duperow. Dolomitization is fabric selective, as only the stromatoporoid boundstone/floatstone and microbially laminated dolowackestone lithofacies contain large amounts of dolomite and well developed intercrystalline porosity. These lithofacies are traceable and correlated throughout the entire study area and extend away from the known producing regions along the Nesson and Billings anticlines. The high degrees of dolomitization observed are the result of active fracture and fault systems acting as conduits for dolomitizing fluids. Paleostructural highs and lows allow for the migration of fluids into the highly susceptible carbonates of the Duperow Formation. Advisors/Committee Members: R.D. LeFever.

Subjects/Keywords: Geology; Stratigraphic – Devonian; Carbonate rocks – Duperow Formation; Geology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Alcorn, Z. P. (2014). Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/1

Chicago Manual of Style (16th Edition):

Alcorn, Zachary P. “Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota.” 2014. Masters Thesis, University of North Dakota. Accessed March 02, 2021. https://commons.und.edu/theses/1.

MLA Handbook (7th Edition):

Alcorn, Zachary P. “Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota.” 2014. Web. 02 Mar 2021.

Vancouver:

Alcorn ZP. Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota. [Internet] [Masters thesis]. University of North Dakota; 2014. [cited 2021 Mar 02]. Available from: https://commons.und.edu/theses/1.

Council of Science Editors:

Alcorn ZP. Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota. [Masters Thesis]. University of North Dakota; 2014. Available from: https://commons.und.edu/theses/1

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