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Semi-open and closed system pyrolysis of Paleogene coal for evaluating the timing of hydrocarbon gas expulsion

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Title: Semi-open and closed system pyrolysis of Paleogene coal for evaluating the timing of hydrocarbon gas expulsion
Authors: Takahashi, Koji U. Browse this author
Suzuki, Noriyuki Browse this author →KAKEN DB
Keywords: Paleogene coal
Carbon isotopic composition
Hydrogen isotopic composition
Hydrocarbon gas expulsion
Open system pyrolysis
Closed system pyrolysis
Issue Date: 1-Jun-2017
Journal Title: International Journal of Coal Geology
Volume: 178
Start Page: 100
End Page: 109
Publisher DOI: 10.1016/j.coal.2017.05.004
Abstract: Hydrocarbon gas expulsion from coal source rocks takes place under conditions intermediate between an open and closed system. The compositional and isotopic changes of hydrocarbon gases generated from Paleogene coal with increasing maturity were investigated under semi-open and closed system laboratory pyrolysis to evaluate the maturity level at the time of hydrocarbon gas expulsion. Lower yields of saturated hydrocarbon gases and their higher δ13C values were observed in the semi-open system pyrolysis compared to those at the same maturity level in the closed system pyrolysis, since gaseous hydrocarbons depleted in 13C were removed during semi-open system pyrolysis. The δ2H values of hydrocarbon gases generated in the closed system pyrolysis were initially lower than those in the semi-open system pyrolysis, and then became markedly higher at the higher maturity level (vitrinite reflectance [VRr] > 1.2%), indicating significant hydrogenation of isotopically heavier inorganic hydrogen derived from water moisture in the coal matrix. The semi-open and closed system pyrolysis showed that the relationship between the isotopic composition of hydrocarbon gases expelled from coal and the maturity of coal depends on the state of openness or closedness of the hydrocarbon generation environment. Diagrams showing the relationship between the δ13C values of hydrocarbon gases expelled from Paleogene coal and the VRr under conditions intermediate between semi-open and semi-closed systems were proposed for evaluating the timing of hydrocarbon gas expulsion in sedimentary basins.
Rights: © 2017 This manuscript version is made available under the CC-BY-NC-ND 4.0 license
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: 鈴木 徳行

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