We analyzed a 3D seismic survey acquired for a carbon sequestration project on top of the Moxa Arch in southwestern Wyoming. We observed a zone of discontinuous reflectors on vertical slices of seismic amplitude volume, whereas, the NW-SE lineations were observed on the time slices. We performed a seismic to well tie which suggested that the lineations occur within the Nugget Sandstone. The Nugget Sandstone is an eolian sandstone deposit of Early Jurassic age, deposited as a subtropical dune field, and equivalent to the Navajo Sandstone of southwestern Utah. Petrophysical analysis indicates that the Nugget Sandstone is dominated by clean sandstone (70-80%) whereas evaporites, including halite and anhydrite, are present in certain zones. Previous outcrop studies on the Navajo Sandstone indicate the wind direction to be predominately NE-SW. Seismic attributes, including coherence and curvature, displayed on stratal slices within the Nugget Sandstone interval indicate the presence of lineations in NW-SE direction with an irregular spacing. These lineations are approximately perpendicular to the inferred dominant wind direction. We computed the dominant wind direction from the average azimuth of the lineations as seen on the curvature attribute in the Nugget Sandstone interval.
The Green River Basin in the SW Wyoming is responsible for all production within Lincoln, Sublette, Sweetwater, and Uinta Counties in Wyoming. This study focuses on peculiar features in the Lincoln County, we call them FLTs (funny looking things), observed in the seismic data associated with the Triassic/Jurassic deposition in the Moxa Arch. The acquisition and processing errors cannot explain these features, which led us to look for a geologic explanation. Well to seismic ties on three wells surrounding the seismic survey indicated that the observed FLTs on seismic correspond to the Jurassic aged Nugget Sandstone formation. Based on the seismic inversion and the petrophysical model, we concluded that the lithology distribution is comprised of dunal and inter-dunal deposits.Downloaded 08/28/18 to 204.158.162.12. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ 0 1 5,000 ft
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