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Origins of hydrocarbons in the Sagara oil field, central Japan

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Title: Origins of hydrocarbons in the Sagara oil field, central Japan
Authors: Toki, Tomohiro Browse this author
Gamo, Toshitaka Browse this author
Tsunogai, Urumu Browse this author →KAKEN DB
Keywords: Sagara oil field
free gas
in situ fluid
carbon isotope
thermogenic origin
microbial origin
Issue Date: Sep-2006
Publisher: Blackwell Publishing
Journal Title: Island Arc
Volume: 15
Issue: 3
Start Page: 285
End Page: 291
Publisher DOI: 10.1111/j.1440-1738.2006.00528.x
Abstract: We collected free-gas and in situ fluid samples up to a depth of 200.6 m from the Sagara oil field, central Japan (34°44′N, 138°15′E), during the Sagara Drilling Program (SDP) and measured the concentrations and stable carbon isotopic compositions of CH4 and C2H6 in the samples. A combination of the CH4/C2H6 ratios with the carbon isotope ratios of methane indicates that the hydrocarbon gases are predominantly of thermogenic origin at all depths. The isotope signature of hydrocarbon gases of δ13CCH4 < δ13CC2H6 suggests that these gases in the Sagara oil field are not generated by polymerization, but by the decomposition of organic materials.
Rights: The definitive version is available at
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 土岐 知弘

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