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This database and accompanying text depict historical and modern reported occurrences of petroleum both in wells and at the surface within the boundaries of the Central Alaska Province. These data were compiled from previously published and unpublished sources and were prepared for use in the 2002 U.S. Geological Survey petroleum assessment of Central Alaska, Yukon Flats region. Indications of petroleum are described as oil or gas shows in wells, oil or gas seeps, or outcrops of oil shale or oil-bearing rock and include confirmed and unconfirmed reports. The scale of the source map limits the spatial resolution (scale) of the database to 1:2,500,000 or smaller.
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Fractionation of petroleum during migration through sedimentary rock matrices has been observed across lengths of meters to kilometers. Selective adsorption of specific chemical moieties at mineral surfaces and/or the phase behavior of petroleum during pressure changes are typically invoked to explain this behavior. Given the current emphasis on unconventional (continuous) resources, there is a need to understand petroleum fractionation occurring during expulsion and migration at the nanometer to micron scale, due to the fine-grained nature of petroliferous mudrocks. Here organic matter compositional differences observed within kukersite petroleum source beds (containing acritarch Gloeocapsomorpha prisca) from the...


    map background search result map search result map Maps showing sedimentary basins, surface thermal maturity, and indications of petroleum in the central Alaska province: Indications of petroleum Nanoscale Molecular Fractionation of Organic Matter within Unconventional Petroleum Source Beds (2019) Nanoscale Molecular Fractionation of Organic Matter within Unconventional Petroleum Source Beds (2019) Maps showing sedimentary basins, surface thermal maturity, and indications of petroleum in the central Alaska province: Indications of petroleum