DEVELOPING A SEQUENCE STRATIGRAPHIC MODEL FOR THE LOWER HENRYHOUSE FORMATION, HUNTON GROUP, SUBSURFACE CENTRAL OKLAHOMA, USING CORE, CUTTINGS DESCRIPTIONS, AND TRIPLE-COMBO AND MICROIMAGING LOGS

Developing a sequence stratigraphic model of the Hunton Group in the subsurface of central Oklahoma is difficult due to the nature of carbonate deposits and the distance between subsurface study areas and the outcrops in southern Oklahoma where the stratigraphy of the Hunton Group was established. Identifying erosional surfaces in the subsurface is difficult within carbonates because it is common for very little detrital material to be preserved that can be detected by wireline logs or identified in drill cutting sample descriptions. The paucity of cores within central Oklahoma that cover most of the Hunton Group and multiple sequence boundaries within the group makes it difficult to correlate stratigraphic surfaces and develop a sequence stratigraphic model between sequence boundaries. This has increased the importance of microimaging logs that provide high-resolution views of depositional and biotic features, dissolution features, and lithology, that when coupled with drill cutting sample descriptions, provide a reasonable proxy for cores. The confidence in formation microimaging resolving geological features improves significantly when microimaging logs are calibrated to nearby cores.

This work expands on prior research on the influence of prior-, syn- and post-depositional tectonics during the Silurian that influenced Hunton deposition and lays the groundwork for developing a sequence stratigraphic model of what is informally called the Lower Henryhouse Formation in the Hunton Group, central Oklahoma. Additionally, applying results of recent research to the Hunton Group in the Oklahoma City area results in a better understanding of why anomalous and unexpected thickening and thinning of subunits in the Lower Henryhouse and Chimneyhill sections are observed within areas with abundant well control.