Reevaluation of generation condition for hydrothermal petroleum at seafloor hydrothermal system

• Project/Area Number: 24340135
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Okayama University
• Principal Investigator: YAMANAKA TOSHIRO 岡山大学, 自然科学研究科, 准教授 (60343331)
• Co-Investigator(Kenkyū-buntansha): CHIBA Hitoshi 岡山大学, 大学院自然科学研究科, 教授 (30144736) ; ISHIBASHI Jun-ichiro 九州大学, 大学院理学研究院, 准教授 (20212920) ; MURAKAMI Hiroyasu 独立行浩康政法人産業技術総合研究所, 地圏資源環境研究部門, 主任研究員 (40371083) ; YONEZU Kotaro 九州大学, 大学院工学研究院, 助教 (90552208)
• Co-Investigator(Renkei-kenkyūsha): YONEZU Kotaro 九州大学, 大学院工学研究院, 助教 (90552208) ; NOGUCHI Takuro 海洋研究開発機構, 海洋工学センター, 特任技術研究員 (90600643) ; MIYOSHI Yoko 独立行浩康政法人産業技術総合研究所, 特任研究員 ; FUJINO Keiko (株)マリンワークジャパン, 社員
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
• Keywords: 海洋資源 / 海底熱水系 / 熱水性石油 / oil window / 鹿児島湾

Outline of Final Research Achievements

Although hydrothermal petroleum had been considered to require a high temperature (higher than 250 degree C) for its generation, we sampled core sediments and reevaluated the generation condition at the actual site occurred the petroleum. As a result, petroleum generation from matured organic matter was confirmed at about 10 m depth below seafloor. At that depth significant intrusion of hydrothermal fluid was not observed and alteration clay mineral occurred at high temperature and hydrothermal clay minerals were rarely found. It suggests that the sediment at that depth dose not experience high temperature over 100 degree C. The temperature estimated by biomarker maturation indies is about 120 degree C , it is also comparable with the observation. In conclusion, it was confirmed that hydrothermal petroleum is generated at the temperature range (oil window) similar to conventional petroleum generation.

Research Products

• [Journal Article] 鹿児島湾若尊火口と周辺での熱流量分布 (2015)
  • Author(s): (69)藤野恵子・山中寿朗・江原幸雄・藤光康宏
  • Journal Title: 日本地熱学会誌 Volume: 37 Pages: 13-26
  • NAID: 130005097777
  • Peer Reviewed / Open Access
• [Journal Article] Diversity of fluid geochemistry affected by processes during fluid upwelling in active hydrothermal fields in the Izena Hole, the middle Okinawa Trough back-arc basin (2014)
  • Author(s): Ishibashi, J ; Noguchi, T ; Toki, T ; Miyabe, S ; Yamagami, S ; Onishi, Y ; Yamanaka, T ; Yokoyama, Y ; Omori, E ; Takahashi, Y ; Hatada, K ; Nakaguchi, Y ; Yshizaki, M ; Konno, U ; Shibuya, T ; Takai, K ; Inagaki, F ; Kawagucci, S
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 48 Issue: 4 Pages: 357-369
  • DOI: 10.2343/geochemj.2.0311
  • NAID: 130004678556
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access
• [Journal Article] Shallow submarine hydrothermal activity with significant contribution of magmatic water producing talc chimneys in the Wakamiko Crater of Kagoshima Bay, southern Kyushu, Japan. (2013)
  • Author(s): Yamanaka, T., Maeto, K., Akashi, H., Ishibashi, J., Miyoshi, Y., Okamura, K., Noguchi, T., Kuwahara, Y., Toki, T., Tsunogai, U., Ura, T., Nakatani, T., Maki, T., Kubokawa, K., and Chiba, H.
  • Journal Title: J. Volcan. Geotherm. Res. Volume: (in press) Pages: 74-84
  • DOI: 10.1016/j.jvolgeores.2013.04.007
  • Peer Reviewed
• [Journal Article] Mg-rich clay mineral formation associated with marine shallow-water hydrothermal activity in an arc volcanic caldera setting (2013)
  • Author(s): Y. Miyoshi, J-I. Ishibashi, K. Faure, K. Maeto, S. Matsukura, A. Omura, K. Shimada, H. Sato, T. Sakamoto, S. Uehara, H. Chiba, T. Yamanaka
  • Journal Title: Chemical Geology Volume: 355 Pages: 28-44
  • DOI: 10.1016/j.chemgeo.2013.05.033
  • Peer Reviewed
• [Journal Article] Fast Measurement of Dissolved Inorganic Carbon Concentration for Small Volume Interstitial Water by Acid Extraction and Nondispersive Infrared Gas Analysis (2013)
  • Author(s): T. Noguchi, M. Hatta, T. Yamanaka, K. Okamura
  • Journal Title: Analytical Sciences Volume: 29 Pages: 9-13
  • NAID: 10031147318
  • Peer Reviewed
• [Journal Article] Growth temperatures of archaeal communities can be estimated from the guanine-plus-cytosine contents of 16S rRNA gene fragments (2013)
  • Author(s): Hiroyuki Kimura, Kousuke Mori, Toshiro Yamanaka, Jun-Ichiro Ishibashi
  • Journal Title: Environmental Microbiology Reports Volume: Vol.5 Issue: 3 Pages: 468-474
  • DOI: 10.1111/1758-2229.12035
  • Peer Reviewed
• [Presentation] 浅海熱水活動域における堆積層中の抽出性有機物組成と熟成の評価 (2014)
  • Author(s): 奥西勇介・柏村朋紀・山中寿朗
  • Organizer: 第32回有機地球化学シンポジウム
  • Place of Presentation: 湯河原
  • Year and Date: 2014-11-06
• [Presentation] 鹿児島湾奥部姶良カルデラ底から噴出するCO2のフラックス見積へのCH4酸化の及ぼす影響 (2014)
  • Author(s): 金銅和菜・奥西勇介・山本智子・山中寿朗
  • Organizer: 2014年度日本地球化学会第61回年会
  • Place of Presentation: 富山大学
  • Year and Date: 2014-09-16
• [Presentation] 島弧－背弧系に関連した海底熱水活動による熱水性石油の生成条件 (2014)
  • Author(s): 山中寿朗・奥西勇介・柏村朋紀・赤司裕紀
  • Organizer: 日本地質学会第121年学術大会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2014-09-14
  • Invited
• [Presentation] 金を伴う熱水性輝安鉱鉱床生成の地球化学的束縛条件の解明 : NT12-08次航海概要 (2013)
  • Author(s): 山中寿朗, 金銅和菜, 柏村朋紀, 石橘純一郎, 長原正人, 井上博靖, 米津幸太郎, 歛光隼哉, 野口拓郎, 岡村慶, 他
  • Organizer: ブルーアースシンポジウム'13
  • Place of Presentation: 東京海洋大学品川キャンパス
  • Year and Date: 2013-03-14
• [Presentation] What is the constraint Oil formation of oil-starved hydrothermal systems in the sediment-rich Okinawa Irough, southwestern Japan (2012)
  • Author(s): Toshiro Yamanaka, 他
  • Organizer: American Geophysical Union 2012 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2012-12-03
• [Presentation] Large contribution of the magmatic water to the seafloor hydrothermal fluid at the Wakamiko hydrothermal field and its associated mineralization in Aira Caldera, southern Kyushu, Japan
  • Author(s): Toshiro Yamanaka, Kotaro Maeto, Hironori Akashi, Jun-Ichiro Ishibashi, Yoko Miyoshi, Kei Okamura, Takuro Noguchi, Tomohiro Toki, Urumu Tsunogai, Tamaki Ura, Takeshi Nakatani, Toshihiro Maki, Hitoshi Chiba
  • Organizer: IAVCEI 2013 Scientific Assembly
  • Place of Presentation: 鹿児島県民交流センター
• [Presentation] CO2 and methane flux from the submerged Wakamiko Crater in Aira Caldera of Kagoshima Bay, southern Kyushu, Japan
  • Author(s): Kazuna Kondo, Toshiro Yamanaka, Kento Saka, Shousei Yamagami, Kei Okamura, Takuro Noguchi, Tomohiro Toki, Hitoshi Chiba
  • Organizer: IAVCEI 2013 Scientific Assembly
  • Place of Presentation: 鹿児島県民交流センター
• [Presentation] Subvent hydrothermal mineralization and rare metal accumulation within the unconsolidated sediments of Wakamiko submarine crater in Aira Caldera, southern Kyushu, Japan
  • Author(s): Tomoki Kashimura, Yoko Miyoshi, Yoshiko Furuzawa, Takuro Noguchi, Koichi Takamiya4, Ryo Okumura, Jun-ichiro Ishibashi, Toshiro Yamanaka
  • Organizer: IAVCEI 2013 Scientific Assembly
  • Place of Presentation: 鹿児島県民交流センター
• [Remarks] 姶良プロジェクト
  • URL: http://earth.desc.okayama-u.ac.jp/~benthos/aira/
• [Remarks] Aira project
  • URL: http://earth.desc.okayama-u.ac.jp/~benthos/aira/
• [Remarks]
  • URL: http://earth.desc.okayama-u.ac.jp/~benthos/aira/