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2021 年度 実績報告書

Insights into hydrocarbons cycling in the subsurface from isotopologue analysis

研究課題

研究課題/領域番号 21H01198
研究機関東京工業大学

研究代表者

ジルベルト アレキシー  東京工業大学, 理学院, 准教授 (20726955)

研究分担者 中川 麻悠子  東京工業大学, 地球生命研究所, 特任助教 (20647664)
山田 桂太  東京工業大学, 物質理工学院, 准教授 (70323780)
研究期間 (年度) 2021-04-01 – 2024-03-31
キーワードHydrocarbons / Carbon cycle / Subsurface / Isotopologue
研究実績の概要

We sampled at Goshogake mud volcano (Akita prefecture). The geological setting is a mix between sedimentary and volcanic mud volcano. Unfortunately, after analysis we found that the gas contained mainly CO2 (99%) and very few methane or other hydrocarbons. We decided to give up studying this setting given that the goal of the project is to study hydrocarbons cycling.
In parallel, we went sampling in Tokamachi (Niigata prefecture) and analyzed isotpologue of hydrocarbons, the results of which will appear in a paper to be submitted.
We also started incubation experiments using the mud from Tokamachi and diverse substrates. We could grow microorganisms using different substrates: acetate, CO2 + H2 and hexadecane.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

We tried to sample at Goshogake, a mud volcano in Akita prefecture.
Unfortunately, the sampling appeared difficult, and the only samples that we could measure show high CO2 amounts and low methane amounts, which suggest this setting is not related to hydrocarbons generation.
We therefore decided to focus on Tokamachi mud volcano and take advantage of the numerous gas seeps present to build a quantitative model of hydrocarbon cycling using this setting as a model

今後の研究の推進方策

We will continue culture experiments, with. a particular focus on methanogens which are allegedly responsible for the high 13C/12C CO2 in biodegraded oil reservoirs. Other microorganisms will also be investigated, notably hexadecane which allows simulating oil biodegradation.
We will focus on Tokamachi mud volcano since it provides several sampling points with different levels of biodegradation. This will allow us to build a quantitative model of C-cycling in hydrocarbons-based ecosystems.
We will also explore the isotopologue signatures of methane, ethane and propane and how they are affected by biodegradation.

  • 研究成果

    (6件)

すべて 2021

すべて 雑誌論文 (2件) (うち国際共著 2件、 査読あり 2件、 オープンアクセス 1件) 学会発表 (4件) (うち国際学会 4件、 招待講演 1件)

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    • 著者名/発表者名
      Bekaert D. V., Nakagawa,M. et al.
    • 雑誌名

      Proceedings of the National Academy of Sciences

      巻: 118 ページ: e2110997118

    • DOI

      10.1073/pnas.2110997118

    • 査読あり / オープンアクセス / 国際共著
  • [雑誌論文] Effect of tectonic processes on biosphere-geosphere feedbacks across a convergent margin2021

    • 著者名/発表者名
      Fullerton Katherine M., Nakagawa M. et al.
    • 雑誌名

      Nature Geoscience

      巻: 14 ページ: 301-306

    • DOI

      10.1038/s41561-021-00725-0

    • 査読あり / 国際共著
  • [学会発表] △34S18O systematics of modern sulfate2021

    • 著者名/発表者名
      Toshiki Katsuta, Yuichiro Ueno, Mayuko Nakagawa, Riho Aoki, Naohiro Yoshida
    • 学会等名
      GOLDSCHMIDT
    • 国際学会
  • [学会発表] The role of ferrous saponite in the formation of sulfur-bearing organic matter on early Earth and early Mars2021

    • 著者名/発表者名
      Natsumi Noda, Yasuhito Sekine, Yoshio Takahashi, Hiroshi Sakuma, Takahiro Kawai, Mayuko Nakagawa, Norio Kitadai, Kristin Johnson-Finn, Shawn E McGlynn
    • 学会等名
      GOLDSCHMIDT
    • 国際学会
  • [学会発表] Volatile characteristics of Central American geothermal fluids2021

    • 著者名/発表者名
      Peter H Barry, David V Bekaert, Maarten de Moor, Jabrane Labidi, Esteban Gazel, Mayuko Nakagawa, Donato Giovannelli, Matt Schrenk, Karen Lloyd
    • 学会等名
      GOLDSCHMIDT
    • 国際学会
  • [学会発表] Application of fluorination method to isotopologue biogeochemistry2021

    • 著者名/発表者名
      Y Ueno, T Katsuta, K Taguchi, M Nakagawa, N Yoshida, A Gilbert
    • 学会等名
      GOLDSCHMIDT
    • 国際学会 / 招待講演

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公開日: 2023-12-25  

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