Subsurface stratigraphic picks of the Middle–Upper Triassic Shublik Formation, Alaska North Slope
Dates
Publication Date
2020-02-13
Time Period
2020
Citation
Rouse, W.A., Whidden, K.J., Dumoulin, J.A., and Houseknecht, D.W., 2020, Subsurface stratigraphic picks of the Middle–Upper Triassic Shublik Formation, Alaska North Slope: U.S. Geological Survey data release, https://doi.org/10.5066/P91O4B6R.
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 [...]
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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Product_10.5066P91O4B6R_METADATA.xml Original FGDC Metadata
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Shublik_Tops.csv
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Purpose
Data was compiled to facilitate correlation of depositional facies, map facies across the Alaska North Slope, and interpret likely geologic influences on Middle–Upper Triassic depositional patterns.
