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- W2007019076 abstract "The hydrocarbon potential of the St. George Basin, Alaska, was evaluated using both one- and two-dimensional basin models. Whereas the St. George Basin was probably cooler in the past, the sensitivity of the results to uncertainties in lithology, depth to basement, depth to formation tops, and palaeo-water depth, suggests that a range of heat flow histories is the appropriate way to model the hydrocarbon potential. On the margins of the basin, the models predict that small amounts of hydrocarbons have been generated from Eocene and Early Oligocene sediments starting at about 37.0 million years before present (MYBP) (high paleeo-heat flux) or at 5.0 MYBP (cool palaeo-heat flux). In the deepest part of the St. George Basin, the models predict that the pre-Pliocene sediments have generated hydrocarbons from at least 24.0 MYBP. At both locations the different heat flow scenarios affect the predicted timing of hydrocarbon generation but not the age of the sediments which generate hydrocarbons nor the amount of hydrocarbons accumulated. A regional seismic line, which intersects the COST 1 well, was depth converted and ‘drilled’ by regularly spaced pseudo-wells from which a cross-section was constructed. Modelling the cross-section using a two-dimensional model predicted the same results as those obtained from the one-dimensional model, indicating that a one-dimensional approach was sufficient to approximate this section. Both models predict a negligible accumulation of hydrocarbons at COST 1, i.e. COST 1 is a dry well. A synthesis of modelled results and qualitative information indicates that the St. George Basin has a very low potential for hydrocarbon accumulation. On the basin margin the limited source quality and lack of seals result in a low accumulation of any generated hydrocarbons. Hydrocarbons generated elsewhere in the basin may be lost vertically or trapped within the graben in difficult to identify traps. Overall the St. George Basin is an unattractive exploration target." @default.
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- W2007019076 date "1991-11-01" @default.
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- W2007019076 title "Basin evolution, thermal history and hydrocarbon potential of the St. George Basin, Bering Sea, Alaska: a comparative study using one- and two-dimensional models" @default.
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- W2007019076 doi "https://doi.org/10.1016/0264-8172(91)90062-6" @default.
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