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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
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Kornacki, A. S., 1996, Petroleum geology and geochemistry of Miocene source rocks and heavy petroleum samples from Huasna Basin, California, in D. Schumacher and M. A. Abrams, eds., Hydrocarbon migration and its near-surface expression: AAPG Memoir 66, p. 413-430. | ||||||||||||
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The tarry petroleum obtained at seeps is more severely biodegraded than a heavy oil sample from the Huasna field. The chemistry of these petroleum samples, especially their V/Ni ratios and sulfur concentrations, can be used to classify them into distinct groups. High-sulfur samples contain >4 wt. % sulfur and are enriched in V relative to Ni. Low-sulfur samples contain <2 wt. % sulfur and are enriched in Ni relative to V. One tar sample exhibits an intermediate chemistry. Sour oil and tars from the western flank of the Huasna Basin were generated by phosphatic Monterey shales or clay-poor siliceous Monterey shales containing sulfur-rich (Type II-S) kerogen. The sweeter petroleum seeping along the eastern margin of the basin was probably generated by more proximal, clay-rich Miocene shales containing Type II kerogen. Monterey lithofacies variations in the Huasna Basin and the distribution of subsurface oil and gas support this interpretation, as does the organic geochemistry of bitumen samples extracted from mature shales. Thus, inferred differences in Miocene oil quality within the Huasna Basin seem to have been influenced primarily by source effects (with a significant overprint of biodegradation) rather than by thermal maturity effects alone. |
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