Journal
MARINE AND PETROLEUM GEOLOGY
Volume 24, Issue 2, Pages 67-73Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2006.10.002
Keywords
black shales; organic-carbon composition; source-rock potential; hydrocarbon formation; Arctic Ocean; Campanian; Paleogene
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During IODP Expedition 302 (Arctic Coring Expedition-ACEX), the first scientific drilling campaign in the permantly ice-covered central Arctic Ocean, a 430m thick sequence of upper Cretaceaous to Quaternary sediments has been drilled. The lower half of this sequence is composed of organic-carbon-rich (black shale-type) sediments with total organic carbon contents of about 1-14%. Significant amounts of the organic matter preserved in these sediments is of algae-type origin and accumulated under anoxic/euxinic conditions. Here, for the first time detailed data on the source-rock potential of these black shales are presented, indicating that most of the Eocene sediments have a (fair to) good Source-rock potential, prone to generate a gas/oil mixture. The source-rock potential of the Campanian and upper Paleocene sediments, on the other hand, is rather low. The presence of oil or gas already generated in situ, however, can be ruled out due to the immaturity of the ACEX sediments. (c) 2006 Elsevier Ltd. All rights reserved.
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