2023 Fiscal Year Final Research Report
Establishment of a method for collecting seafloor gas in areas where methane hydrate exists
| Project/Area Number |
21K18739
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 22:Civil engineering and related fields
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| Research Institution | Kitami Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2021-07-09 – 2024-03-31
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| Keywords | メタンハイドレート / 湧出ガス / 海洋探査 / 海洋資源 |
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| Outline of Final Research Achievements |
In this study, methane sheep were observed in a wide area off Abashiri in the Sea of Okhotsk using a multi-beam echo sounder, and the amount of methane seeps was calculated from the number of observed seeps. In addition, we investigated the sampling method of seeping methane gas.
In the study of the sampling method, we considered using a recovery membrane (net) as a method of gas sampling. Advantages of using a mesh structure include the following. 1) Due to the mesh structure, there is little resistance due to tidal currents, making it easy to install on the seabed. 2) Excess gas can permeate the mesh and leak to the outside. In order to devise such a recovery device, we created a model of the recovery device, conducted simulation experiments in the actual ocean, and investigated the possibility of gas recovery.
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| Free Research Field |
地盤工学
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| Academic Significance and Societal Importance of the Research Achievements |
網走沖オホーツク海において複数の調査航海で表層型メタンハイドレートが採取されている。表層型メタンハイドレートが賦存している場所では，音響測深機等によって海底面から湧出するガス気泡（メタンシープ）が観測される場合が多い。メタンは二酸化炭素の20倍もの温室効果のあるガスでもあり，湧出ガスの分布や湧出量を評価することは，地球規模の環境変動の解明にもつながる。また，湧出規模によっては資源としての可能性も持っているが，海底から湧出するガスを採取する方法の検討は行われたことはこれまでない。本研究では，簡易な方法でのガス回収方法を考案しており，将来の実用化の可能性も高い。
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