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頁籤選單縮合
題 名 | Distribution and Characters of Gas Hydrate Offshore of Southwestern Taiwan=臺灣西南海域天然氣水合物的分布與特性 |
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作 者 | 劉家瑄; 史菲利; 王詠絢; 鐘三雄; 陳松春; 宣大衡; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷 期 | 17:4 民95.12 |
頁 次 | 頁615-644 |
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; Gas hydrates; Bottom simulating reflectors; Marine seismic reflection data; Passive and convergent boundary; Southwestern Taiwan; |
語 文 | 英文(English) |
英文摘要 | Bottom simulating reflector (BSR) is a key indicator for the presence of gas hydrate beneath the sea floor. Widely distributed BSRs have been observed in the area offshore of southwestern Taiwan where the active accretionary complex meets with the passive China continental margin. In order to better understand the distribution and characters of the gas hydrate in the region, closely spaced (1.86-km line spacing) multichannel seismic reflection surveys have been conducted in recent years under the support of the Central Geological Survey, ROC. Over 10000 km of multichannel seismic reflection profiles have been collected that cover an area of about 10000 km^2 offshore of southwestern Taiwan. BSRs can be identified along 50% of the seismic profiles that we collected. A newly compiled BSR distribution map suggests that gas hydrates are distributed both in the passive margin of the China continental slope as well as in the submarine Taiwan accretionary wedge, from water depths of 500 to over 3000 m. Gas hydrates are most concentrated underneath anticlinal ridges in the accretionary wedge, and underneath the slope ridges of the passive continental margin that were formed due to sedimentary processes. Active fluid activities are evident from various features observed on seismic reflection and chirp sonar profiles, such as mud volcanoes, gas plumes and gas charged shallow sedimentary layers. Fluid migration model has been established from a set of pseudo 3D seismic reflection data. The predicted locations of high fluid flux correlate well with those interpreted from geochemical analyses that show very high methane concentrations and very shallow sulfate-methane interfaces (SMI). This demonstrates the importance of structural control over gas hydrate emplacement. From the observed gas hydrate distribution and characters, the area offshore of southwestern Taiwan provides an ideal place to study and compare the formation and migration of gas hydrates under different tectonic settings. |
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