Gas hydrate forming fluids on the NE Sakhalin slope, Sea of Okhotsk
Gas hydrate forming fluids on the NE Sakhalin slope, Sea of Okhotsk
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鄂霍次克海萨哈林岛东北坡天然气水合物形成流体
DOI：
10.1144/sp319.5
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
E. B. Prilepskiy
中科院分区：
文献类型：
--
作者：
L. Mazurenko;T. Matveeva;E. Prasolov;H. Shoji;A. Obzhirov;Y. Jin;J. Poort;E. Logvina;H. Minami;H. Sakagami;A. Hachikubo;A. Salomatin;A. Salyuk;E. B. Prilepskiy
摘要 2003 年，R/V Akademik M. A. Lavrentyev 在 CHAOS 项目框架内进行的第 31 次和第 32 次国际探险期间，对库页岛东北部、鄂霍次克海的集中流体排放区域进行了调查。发现了 40 多个与海底气体排放相关的结构，并从其中三个结构中采集了天然气水合物样本：CHAOS、Hieroglyph 和 Kitami。地球化学分析用于确定天然气水合物聚集的机制和相关流体的来源。对间隙水和水合物水的化学和同位素分析表明，水合物是由海水（或原位孔隙水）和富含盐的上升流体形成的。水合物形成发生在盐水上升流最密集的位置，这可能是与水合物平衡的水中气体溶解度的函数。天然气水合物形成中涉及的水由约 70% 来自宿主沉积物的孔隙水和 30% 来自上升流体的水组成。参与水合物形成的“流体”的总体同位素组成计算为δ2H≈-11‰和δ18O≈-1.5‰。
Abstract An area of focused fluid venting off NE Sakhalin, Sea of Okhotsk, was investigated in 2003 during the 31st and 32nd international expeditions of R/V Akademik M. A. Lavrentyev within the framework of the CHAOS Project. More than 40 structures related to seafloor gas venting were discovered and gas hydrates were sampled from three of these: CHAOS, Hieroglyph and Kitami. Geochemical analyses were used to define the mechanisms of gas hydrate accumulation and the sources of fluids involved. Chemical and isotopic analyses of the interstitial and hydrate waters suggest that hydrates were formed from seawater (or in-situ pore water) and an ascending fluid enriched in salts. Hydrate formation occurs at locations of the most intensive saline water upflow, and this is probably a function of the gas solubility in water in equilibrium with hydrate. The water involved in gas hydrate formation consists of about 70% pore water derived from the host sediment and 30% from the ascending fluid. The overall isotopic composition of the ‘fluid’ taking part in hydrate formation was calculated as δ2H≈−11‰ and δ18O≈−1.5‰.