3-D Reservoir and Stochastic Fracture Network Modeling for Enhanced Oil Recovery, Circle Ridge Phosphoria/Tensleep Reservoir, Wind River Reservation, Arapaho and Shoshone Tribes, Wyoming Page: 26 of 238
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Era Period Unit Symbol
Mowry Shale
Undifferentiated Thermopolis Ku
Cretaceous Shale
Cloverly Formation Kcv
Morrison Formation Jm
C Sundance Formation Js
N Jurassic
CO Gypsum Springs Formation Jgs
Nugget Sandstone Jn
Popo Agie Member TRpa
Crow Mountain
Chugwater Member TRcm
Triassic Formation
Red Peak Shale TRrp
Dinwoody Formation TRd
Permian Phosphoria Formation Pp
Pennsylvanian Tensleep Sandstone
* .1 Amsden Formation
C) Mississippian
N Madison Limestone
Devonian Darby Formation
Ordovician Bighorn Dolomite
Gallatin Limestone
Cambrian Gros Ventre Shale
Flathead Sandstone
PRECAMBRIANRock Units
Exposed in Outcrop
in the Circle Ridge
Field
Primary Reservoir
UnitsFigure 1-8 Stratigraphic column for the Circle Ridge Formation (from Smith 2000)
only in the subsurface (Olson, 1948). These shelf carbonates are generally homogenous
in lithology with several porosity zones containing commercial petroleum accumulations
(Stipp, 1952). Currently, the Madison Limestone is the deepest drilled reservoir at Circle
Ridge. As of June of 1992, the Madison Limestone had produced 1.317 MMBO
(Anderson and O'Connell, 1993).
1.1.2.1 Amsden Formation
The Amsden Formation is Late Mississippian to Early Pennsylvanian in age, and
occupies the interval between the underlying Madison Limestone and the overlying
Tensleep Formation. The contact of the Amsden Formation with the underlying Madison
Limestone is an erosional unconformity, while the contact of the Amsden Formation with
the overlying Tensleep Formation is conformable (Love, 1939). The Amsden FormationDE-FG26-OOBC 15190
9
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La Pointe, Paul; Hermanson, Jan; Parney, Robert; Eiben, Thorsten; Dunleavy, Mike; Steele, Ken et al. 3-D Reservoir and Stochastic Fracture Network Modeling for Enhanced Oil Recovery, Circle Ridge Phosphoria/Tensleep Reservoir, Wind River Reservation, Arapaho and Shoshone Tribes, Wyoming, report, November 18, 2002; United States. (https://digital.library.unt.edu/ark:/67531/metadc738026/m1/26/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.