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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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