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題名 | Acoustic and Shear-Wave Velocities in Hydrate-Bearing Sediments Offshore Southwestern Taiwan: Tomography, Converted Waves Analysis and Reverse-Time Migration of OBS Records=臺灣西南海域含天然氣水合物地層之P波與S波速度:海底地震儀資料之層析成像、轉換波分析與逆時移位 |
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作者 | 史菲利; 劉家瑄; 李昭興; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷期 | 17:4 民95.12 |
頁次 | 頁757-779 |
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 | 351.925 |
關鍵詞 | 臺灣西南海域; 天然氣水合物; 海底地震儀; Ocean bottom seismometers; Acoustic and shear-wave velocities; Gas hydrates; |
語文 | 英文(English) |
英文摘要 | A 2.5-D combined seismic reflection and refraction survey has been conducted in the accretionary complex offshore of southwestern Taiwan where BSRs (Bottom Simulating Reflectors) are highly concentrated and geochemical signals for the presence of gas hydrate are strong. In this study, we perform velocity analysis of the 6 4-component OBS (Ocean-Bottom Seismometer) records along the southernmost transect of this seismic experiment. We utilize 3 independent methods in order to accurately determine the acoustic and shear-wave velocities of the sediments: 1-D Root Mean Square (RMS) analysis of the P-P and P-S reflected events on individual datumed components, 2-D inversion of the P-P and P-S reflected and refracted events along the in-line transect, and 3-D acoustic inversion of the first arrivals. The principal sources of bias in the determination of the velocities are the 3-dimentional nature of the topography and the complexity of the underlying structures. The three methods result in consistent velocity profiles. Rapid lateral and vertical variations of the velocities are observed. We then investigate the large scale gas hydrate content through rock physic modeling: at the vertical of each OBS, shear-waves velocities are utilized to estimate the water-filled porosities, and the acoustic velocities predicted for a set of gas hydrate, quartz and clay contents are compared to the observed profiles. |
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