Subsurface stratigraphic picks of the Middle-Upper Triassic Shublik Formation, Alaska North Slope

The Middle-Upper Triassic Shublik Formation is the main source rock for Arctic Alaska oil and gas accumulations, including the supergiant Prudhoe Bay field. A revised stratigraphic framework recently has been developed in outcrop for the Shublik and related strata that delineates three large-scale s...

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Bibliographic Details
Main Authors: Rouse, William A, Whidden, Katherine J, Dumoulin, Julie A, Houseknecht, David W
Format: Dataset
Language:unknown
Published: U.S. Geological Survey 2020
Subjects:
Energy Resources
Arctic
Alaska North Slope
north slope
Prudhoe Bay
Alaska
Online Access:https://dx.doi.org/10.5066/p91o4b6r
https://www.sciencebase.gov/catalog/item/5e138050e4b0ecf25c53b38c
Description
Summary:The Middle-Upper Triassic Shublik Formation is the main source rock for Arctic Alaska oil and gas accumulations, including the supergiant Prudhoe Bay field. A revised stratigraphic framework recently has been developed in outcrop for the Shublik and related strata that delineates three large-scale stratigraphic units: 1) the lower clastic (LC) unit, 2) the middle carbonate-chert (MCC) unit, and 3) the upper clastic-carbonate (UCC) unit. The three stratigraphic units were interpreted to comprise five transgressive-regressive (T-R) sequences (LC1, MCC1, MCC2, MCC3, and UCC1). This outcrop-based framework has been extended to the subsurface of the Alaska North Slope using gamma-ray logs from 161 exploration wells. Subsurface stratigraphic picks of the five T-R sequences within the Shublik Formation for each well are documented herein.

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