Teapot Dome oilfield near the town of Midwest, Wyoming has been the testing site of numerous drilling and production techniques since the early 1900s. The structure is a doubly plunging basement-cored anticline that formed during the Laramide orogeny, with sediments ranging from Cambrian to Quaternary. The Steele, Niobrara, and Mowry formations are potential source rocks in the area. In this study, we combined geochemical, basin, and well-log analysis to evaluate the potential of the field for unconventional exploration. Rock Eval® pyrolysis and oxidation of shale samples produced preliminary results showing a mixture of Type II and Type III kerogen in the Niobrara and Mowry formations, while the Steele Formation had no potential for hydrocarbon generation. These geochemical results, combined with regional tectonics, stratigraphy, and sedimentological conditions, were implemented into burial history and maturation models. Results from the modeling show that the Niobrara and Mowry formations are in the early oil generation window, with the Mowry generating a considerably larger amount of hydrocarbons than the Niobrara. Finally, a detailed well log analysis was undertaken using various methods to determine TOC content in areas where core analysis is not available. Passey, Issler, and Schmoker are three different log analysis methods that were tested in order to provide an accurate correlation between Rock Eval TOC and log derived TOC. The results and method of this study can easily be extrapolated to better constrain the basin evolution of nearby fields. This study is significant for further exploration in other established Laramide basins with similar formations.
|Commitee:||Borrok, David, Lock, Brian|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 56/06M(E), Masters Abstracts International|
|Keywords:||Depositional, Dome, History, Plays, Rock, Teapot, Wyoming|
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