Integrated study of environmental impact of gas hydrate

天然气水合物环境影响综合研究

• 批准号: 16201002
• 负责人: MATSUMOTO Ryo
• 金额: $ 29.45万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16201002/
• 关键词: Gas hydrare; Methane plume; Pockmarks; Bacterial mat; Eastern margin of Japan Sea; Umitaka spur; BSRs; Shimokita peninsula; メタンハイドレート; メタンハイドレート・バブル; 日本海; 黒色頁岩; オルドビス-シルル紀境界事変; 化学合成生物; BSR; チンハイ湖; 大量絶滅; 富山湾; メタンプリューム; 硫酸還元; 熱分解起源; 氷期-

The main objective of this program is to make an assessment of the environmental impact of marine gas hydrates through the geological, geophysical, and marine biological approaches and integration of newly obtained data sets. The following are the summary and results of the 3 years program.1. We conducted hydrate-research cruises in the gas hydrate field off Naoetsu by "T/V Umitaka-maru" of Tokyo University of Marine Science and Technology and "Natsushima" and "Kaiyo" of JAMSTEC.2. We identified strong methane seep sites off Naoetsu in Japan Sea. Plumes of methane bubbles stand about 600 meter high on the sea floor of about 900 meter below sea level. The plumes were observed to supply significant amount of methane to shallow waters. The bottom and intermediate waters are very low, -0.2℃, which allows gas bubbles to form gas hydrate in the water masses. This is the main reason why the plumes reach up to shallow waters.3. Submersible dives by "Hyper dolphin" found gas hydrate exposed on the sea floor for the first time around Japan islands. This finding suggests strong methane fluxes in the study area.4. Probably because of low temperatures, benthic communities are relatively simple and monotonous, but characterized by chemosynthetic communities and bacterial mats. Crabs ("Beni-zuwai-gani") are extremely abundant on and near the methane seep sites.5. Large pockmarks, approximately 500 m in diameter, develop on the Umitaka spur where methane seeps and gas hydrate were observed. The pockmarks are inactive, partly buried by mud, implying that extremely violent methane seeps occurred in the past.6. We also conducted gas hydrate cruise off Shimokita peninsula, northwestern Pacific by "Tansei-maru" of JAMSTEC. We could not identify methane seeps or plumes but strong and unusual BSRs seem to indicate development of subsurface gas hydrate and methane generation.

该计划的主要目标是通过地质，地球物理和海洋生物方法以及新获得的数据集的整合，对海洋天然气水合物的环境影响进行评估。以下是3年计划的总结和结果。我们利用东京海洋科学技术大学的“T/V Umitaka-maru”和JAMSTEC的“Natsushima”和“Kaiyo”在直越近海的天然气水合物领域进行了水合物研究巡航。我们在日本海直越海域发现了强烈的甲烷渗漏点。在海平面以下约900米的海底，甲烷气泡柱高约600米。据观察，这些羽流向浅水沃茨提供了大量的甲烷。底层和中层沃茨温度很低，为-0.2℃，这使得气泡在水团中形成天然气水合物。这是羽流到达浅水区的主要原因。由“超级海豚”潜水发现天然气水合物暴露在日本岛屿周围的海底首次。这一发现表明研究区存在较强的甲烷通量.可能是由于低温，底栖生物群落相对简单和单调，但以化能合成群落和细菌垫为特征。螃蟹（“Beni-zuwai-gani”）在甲烷渗漏点及其附近极为丰富。在观察到甲烷渗漏和天然气水合物的Umitaka凸起上，形成了直径约500 m的大麻点。这些麻点是不活跃的，部分被泥浆掩埋，这意味着过去发生过非常猛烈的甲烷渗漏。我们还利用JAMSTEC的“丹生丸”在西北太平洋下北半岛海域进行了天然气水合物巡航。我们无法识别甲烷渗漏或羽流，但强烈和不寻常的BSR似乎表明地下天然气水合物和甲烷生成的发展。

项目成果

Evolution of a gas hydrate system as precorded by oxygen and hydrogen isotopes of the interstitial waters of the JAPEX

由 JAPEX 间隙水的氧和氢同位素记录的天然气水合物系统的演化

• 发表时间: 2005
• 期刊: JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well. G.S.C. Bull. 585
• 作者: Tomaru;H.;Matsumoto;R.;Chen;Y.;Lu;H.;and Clark;I.D.
• 通讯作者: I.D.

Methane seeps and Methane hydrate : Example from off Naoetsu in Japan Sea

甲烷渗漏和甲烷水合物：日本海直江津附近的例子

• 发表时间: 2005
• 期刊: Earth Monthly no. 318
• 作者: Kumamoto;T.;Hamada;Y.;仁科 健;R. Matsumoto
• 通讯作者: R. Matsumoto

Halogen concentrations in pore waters and sediments of the Nankai Trough, Japan: Implications for the origin of gas hydrates

• DOI: 10.1016/j.apgeochem.2006.12.015
• 发表时间: 2007-03
• 期刊: Applied Geochemistry
• 影响因子: 3.4
• 作者: Y. Muramatsu;T. Doi;H. Tomaru;U. Fehn;R. Takeuchi;R. Matsumoto

Search for methane hydrate in Japan Sea

在日本海寻找甲烷水合物

• 发表时间: 2005
• 期刊: Ships&Ocean Newsletter 131
• 作者: 木内 虹平;李 恩兒;原田 和弘;高泉 佳苗;中村 好男;藤田利治;R. Matsumoto
• 通讯作者: R. Matsumoto

メタンシープとメタンハイドレート:日本海・直江津沖の例-総論-

甲烷羊和甲烷水合物：来自日本海和直江津海岸的示例 - 总体概述 -

• 发表时间: 2005
• 期刊: 月刊地球 318号
• 作者: 大城直人;猿渡康文;神田 嘉延;松本 良
• 通讯作者: 松本 良