An Integrated Well Log and 3D Seismic Interpretation of Missourian Clinoforms, Osage County, Oklahoma

<p>Integrated analysis of well and geophysical data can provide detailed geologic interpretation of the subsurface in Osage County, Oklahoma. Systems tracts and depositional system successions can be interpreted at marginal seismic resolution using well log motif with seismic reflector character within a depositional context. Shelf-prism and subaqueous, delta-scale clinoforms of Missourian age observed in 3D seismic were interpreted with greater sequence stratigraphic detail when coupled with wireline well logs. The Late Pennsylvanian Midcontinent Sea was thought to be approximately 150 feet average depth across the southern Midcontinent during the Missourian Stage, and deepen towards the Arkoma and Anadarko Basins to the south. Here we show that the Late Pennsylvanian Midcontinent Sea floor was in water depths greater than 600 feet and sloped to the southeast, toward major, southern basins, during the Missourian Stage in Osage County. Shelf-prism and delta scale clinoforms up to 600 and 300 feet of relief, respectively, were observed in paired seismic and well log cross sections, thickness maps, and structure maps dipping northwest at 052° strike, upon a basin floor dipping southeast at 253° strike. Lithologic and sequence stratigraphic interpretation revealed a mixed carbonate-siliciclastic system comprising of delta, offshore shelf, and carbonate buildup depositional systems of mesothem, 3rd order sequence magnitude. The observed succession included: 1) falling stage to lowstand, sand-prone, subaqueous delta, 2) transgressive to highstand offshore shelf and carbonate bank, and 3) falling stage delta. The depositional sucession demonstrates how carbonate banks related spatially to terrigenous sediment input in northeastern Oklahoma during the Late Pennsylvanian because of glacio-eustasy and possible tectonism. </p>

Name thesis:degree_name

Master of Science in Geology (MS)

Level thesis:degree_level

Thesis

Year dc:date.available

2018

Author dc:creator

• Barker, Abram Max

Advisor dc:contributor.advisor

• McGilvery, T.A. "Mac"

Contributors dc:contributor

• Liner, Christopher L.
• Milligan, Steve

• Clinoforms
• Late Pennsylvanian
• Missourian
• Osage County
• Shelf Prism
• Subaqueous Delta
• Geology
• Sedimentology

Repository record dc:identifier

https://scholarworks.uark.edu/etd/2995

OAI identifier oai:identifier

oai:scholarworks.uark.edu:etd-4545