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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Twelve samples of Jurassic Twin Creek Limestone from seven localities in the Idaho-Wyoming thrust belt region were found to be extremely low in organic matter content, even though the darkest colored and least weathered samples were selected for analysis. We believe that very little organic matter was deposited and preserved in the Twin Creek Limestone in this region. Moreover, rocks of pre-Cretaceous age were subjected to high temperatures unfavorable for preservation of liquid hydrocarbons in localized areas, especially near the point where the borders of Utah, Idaho, and Wyoming join. These interpretations suggest that oil produced from the Twin Creek Limestone and underlying Nugget Sandstone in this region was generated in source rocks of Cretaceous age buried beneath thrust sheets. This oil would have been emplaced in structural traps also associated with thrust movement, after rocks of Jurassic and Triassic age were uplifted, and at temperatures more favorable for the presence of liquid hydrocarbons.
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