HYDROCARBON POTENTIAL OF THE MUDDY SANDSTONE, WIND RIVER BASIN,
Lisa Costanzo, Colorado School of Mines Geology Department, Golden, Colorado, [email protected]
The Muddy Sandstone in
The lower Cretaceous Muddy Sandstone consists of a complex
series of marine and nonmarine coastal/valley-fill
facies whose distribution is controlled by paleotopography
and sea-level fluctuations of the Cretaceous Western Interior Seaway. Previous
interpretations have described the lower facies as a shoreline/estuarine
deposited during relative sea level lowstands. The upper facies is described as
incised valley fill deposited during transgressive and
highstand periods. The Muddy is unconformably underlain by the Albian
age marine Thermopolis Shale and is overlain conformably by the Cenomanian age marine Mowry Shale.
The goal of the study is to explore the hydrocarbon potential of reservoir quality Muddy Sandstone and determine the extents of these deposits on the Wind River Indian Reservation. Application of a sequence stratigraphic framework to well log correlation, core and thin section study, outcrop observations, geologic mapping, production mapping will aid in defining the facies distribution and placement of sandstone bodies.