与火山-热液作用有关的海洋天然气水合物

MARINE GAS HYDRATE RELATED TO VOLCANO-HYDROTHERMALISM

赵洪伟 龚建明 陈建文 李荣柱

Zhao Hongwei Gong Jianming Chen Jianwen Li Rongzhu

吉林大学, 长春 130026 2. 中国地质调查局, 北京 1000352 3. 青岛海洋地质研究所, 山东 青岛 266071 4. 中国海洋大学, 山东 青岛 266003 5. 韩国资源研究院, 韩国 大田 305350

Jilin University, Changchun, Jilin 130026, China 2. China Geologic Survey Bureau, Beijing 100035, China 3. Qingdao Institute of Marine Geology, Qingdao, Shandong 266071, China 4. Ocean University of China, Qingdao, Shandong 266071, China 5. Korea Institute of Geoscience and Mineral Resources, Daejeon 305350, Korea

天然气水合物中烃类主要有生物成因和热解成因,然而随着水合物勘探开发的不断深入,分布于洋底、洋陆过渡带或拉张裂谷区与火山-热液作用有关的天然气水合物的发现则表明,海洋天然气水合物很可能存在第三种类型:无机成因天然气水合物。实验模拟表明,洋底岩石蛇纹石化可生成无机成因的天然气水合物,实际中我们在缺少沉积物的洋底和沉积物有机碳含量低(<0.5%~1.0%)的大陆边缘发现了与火山-热液有关的天然气水合物。因此,今后天然气水合物勘探开发中应特别重视寻找与火山-热液有关的天然气水合物。

Hydrocarbonin gas hydrate mainlyincludes biogenic and thermogenic gases.However,within-creasing understandings of gas hydrate,newevidences are coming to light that there exists inorganic gashydrate related with volcano-hydrothermalism,whichis discoveredin ocean floor,subduction zone or ex-tensional valley.Fieldinvestigations and laboratory si mulation have manifested that,seabed serpentiniza-tion could generate inorganic gases.In fact,we have found gas hydrate related with volcano-hydrother-malism whose sedi ments have thin thickness and low organic carbon quantity.Therefore,inorganic gashydrae deposits should be paid attention toin the future.

国家重点基础研究发展规划项目(G20000467)。

https://doi.org/10.11781/sysydz200504395