Abstract by Geoffrey Ritter
Chemostratigraphy and Burial History of the Gothic Shale (Middle Pennsylvanian), Paradox Basin, SE Utah.
The Paradox Basin is a prolific oil and gas basin that has been producing since the 1950’s. The largest field in the basin (Greater Aneth Field) has an estimated original oil-in-place (OOIP) of 1.3 Billion barrels of oil (Guthrie and Bohacs, 2009). One of the key source rocks that charge the basin is the Gothic Shale. In the Paradox Basin hydrocarbons are most commonly exploited as conventional plays. However, as unconventional plays become more common, source rocks are being studied in greater detail. In this study we investigate the chemostratigraphic cyclicity and source rock potential of the Gothic Shale in a more distal ramp position than previous studies (Guthrie and Bohacs, 2009). This is accomplished by performing pyrolysis on 61 Gothic Shale samples. These samples were taken at one foot intervals from the Cedar Point core. Using these data we have found that: 1) there are five Gothic shale parasequences in the Cedar Point well (TOC and Gamma Ray curves); and 2) in this distal portion of the ramp, the Gothic Shale was buried into the oil window causing the thermal cracking of organic material.