Facies Analysis and Reservoir Zonation of a Cretaceous Shelf Sand Ridge: Hartzog Draw Field, Wyoming
Published:January 01, 1986
Robert S. Tye, Vishnu Ranganathan, W. J. Ebanks, Jr., 1986. "Facies Analysis and Reservoir Zonation of a Cretaceous Shelf Sand Ridge: Hartzog Draw Field, Wyoming", Modern and Ancient Shelf Clastics: A Core Workshop, Thomas F. Moslow, Eugene G. Rhodes
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Geologic analysis of the Hartzog Draw Field pilot area indicates that reservoir behavior is predominantly controlled by the processes of deposition and the diagenetic history of the genetic facies composing the reservoir. Central-bar, bar-margin, and interbar facies of the Cretaceous Shannon Sandstone were deposited as an elongate shelf sand ridge in the Cretaceous seaway of northern Wyoming.
A typical vertical sequence in the Hartzog Draw Field coarsens upward and consists of rippled to bioturbated, very fine-grained interbar sandstone interlayered with trough cross-bedded and rippled medium- to fine-grained bar-margin sandstone and overlain by cross-bedded and rippled medium- to fine-grained central-bar...
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Modern and Ancient Shelf Clastics: A Core Workshop
The organizers of this core workshop opted for a broad, permissive definition of shelf clastics and contributors were encouraged to focus on their own interpretations rather than force-fitting their examples to a restrictive theme. As a result, the editors assembled a selection of core examples which range from standline to shelf edge. Given the dominance of petrophysical logs in subsurface studies, contributors to the workshop worked hard to make the necessary core-to-log comparisons which were essential if geologists are to more fully utilize wireline data in facies analysis. Contributors were also encouraged to place their studies within the context of energy prospects associated with environments of deposition. Hydrocarbon potential and reservoir quality dominate these discussions. The high degree of lithofacies variability and the effect of high-energy events on shelf deposits cause sediments formed within this environment to be particularly challenging exploration targets.