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題 名 | Methane Venting in Gas Hydrate Potential Area Offshore of SW Taiwan: Evidence of Gas Analysis of Water Column Samples=臺灣西南海域天然氣水合物賦存區甲烷正在逸氣之證據:水柱樣品溶解氣分析之結果 |
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作 者 | 楊燦堯; 莊佩涓; 林曉武; 陳汝勤; 王詠絢; 鐘三雄; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 17:4 民95.12 |
頁 次 | 頁933-950 |
專 輯 | 南海與臺灣鄰近地區之天然氣水合物研究專刊 |
分類號 | 457.8 |
關鍵詞 | 臺灣西南海域; 天然氣水合物; 甲烷; Gas hydrate; Methane venting; Water column; Helium; Radon; |
語 文 | 英文(English) |
英文摘要 | Water column samples were collected systematically in several potential gas hydrate areas offshore of SW Taiwan for analysis of dissolved gases. Some these samples show unusually high dissolved methane concentrations at sites A, B, C, and H of cruise ORI-765. The profiles of helium concentrations in the dissolved gases of the water column also exhibit consistent results with an increasing trend toward the seafloor. The 3He/4He ratios range from 0.2 to 0.4 times that of the atmospheric air ratio after air correction, which fall in the range of typical crustal gas composition and are similar to those of on-shore mud volcanoes in SW Taiwan. This indicates that gases are venting actively from the seafloor in the region and may share similar gas sources to on-shore mud volcanoes. The venting gases are considered to have originated from dissociation of gas hydrates and/or a deeper gas reservoir. |
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