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Geochemical correlation studies of seven oils and source rocks from the onshore Tempoku basin of northern Hokkaido were carried out. Low sulfur, high wax and high pristane/phytane ratios of the oils suggest that they were generated mainly from nonmarine source rocks. Source rock evaluation and hydrous pyrolysis data show that coals and coaly shales in the Paleogene Haboro Formation and Cretaceous...
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