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Student Number 976202016
Author Tsung-Yu Shih(施宗佑)
Author's Email Address No Public.
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Department Graduate Institute of Geophysics
Year 2009
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title The study of high-resolution sidescan sonar and sub-bottom profiler data in gas hydrate-bearing area, off southwest Taiwan
Date of Defense 2010-04-23
Page Count 110
Keyword
  • gas hydrate
  • sidescan sonar
  • sub-bottom profiler
  • Abstract The offshore area of the SW Taiwan is located in the oblique convergence zone between the
    northern continental margin of South China Sea and accretionary wedge. In the accretionary
    wedge, there are a series of folds and thrust faults. The continental margin consists of a series of
    the rifted basin and thick sediments. Our study area is located in the northern Good Weather
    Ridge of the lower slope of the wedge. According to the geophysical, geochemical and
    geothermal researches off SW Taiwan, abundant gas hydrate may exist. Our main purpose is to
    use high-resolution sidescan sonar and sub-bottom profiler to survey the near seafloor features of
    the gas hydrate formation off SW Taiwan.
    We have collected 13 deep-towed lines in northern Good Weather Ridge. The results show
    that many erosion features are found in study area and their morphology are different. Besides,
    we modify some thrust faults location on the basic of our results. We also find pockmarks, mud
    volcano, authogenic carbonate and acoustic transparent zones. These features imply that there are
    abundant gas and fluid paths in this region. Our study area is suitable for forming gas hydrate in
    terms of temperature and pressure condition. These evidences indicate that there is high potential
    for preserving gas and gas hydrate in our study area. Therefore, we suggest that the material in
    acoustic transparent layers which are near the pockmarks may be gas hydrate. After integrating
    all data, we construct a 3D model for the gas migration and gas hydrate-bearing in our study
    area.
    Table of Content 中文摘要.................................................................................................................................... i
    英文摘要...................................................................................................................................ii
    誌 謝..................................................................................................................................iii
    目 錄.................................................................................................................................. iv
    表 目.................................................................................................................................. vi
    圖 目.................................................................................................................................vii
    第一章 緒論........................................................................................................................ 1
    1.1 台灣西南海域地體架構......................................................................................... 1
    1.2 本文研究區域與前人研究..................................................................................... 1
    1.3 研究目的................................................................................................................. 2
    第二章 資料收集與處理方法............................................................................................ 7
    2.1 底拖側掃聲納......................................................................................................... 7
    2.1.1 基本原理...................................................................................................... 7
    2.1.2 資料成像原理與解析度.............................................................................. 9
    2.1.3 資料處理方法............................................................................................ 11
    2.2 淺層底質剖面儀................................................................................................... 16
    2.2.1 基本原理.................................................................................................... 16
    2.2.2 資料處理方法............................................................................................ 17
    2.3 多頻道科學漁探儀............................................................................................... 19
    2.4 多頻道反射震測................................................................................................... 20
    第三章 結果...................................................................................................................... 50
    3.1 多頻道漁探儀資料結果....................................................................................... 50
    3.2 泥火山................................................................................................................... 51
    3.3 麻坑構造............................................................................................................... 52
    3.4 聲波透明帶........................................................................................................... 53
    3.5 破裂帶................................................................................................................... 55
    3.6 侵蝕構造............................................................................................................... 56
    第四章 討論...................................................................................................................... 78
    4.1 研究結果與區域地體構造的關係....................................................................... 78
    v
    4.2 天然氣移棲與天然氣水合物賦存模型............................................................... 81
    第五章 結論...................................................................................................................... 93
    參考文獻................................................................................................................................. 95
    附錄A..................................................................................................................................... 97
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    林曉武:台灣西南海域新興能源-天然氣水合物資源調查與評估-地球化學調查研究
    (2/4), 台灣西南海域自生性碳酸鹽及硫物種之變化與天然氣水合物賦存之關
    係. 經濟部中央地質調查所報告,第98-27C 號,2009.
    林殿順:台灣西南海域天然氣水合物賦存區地質調查研究-地球物理調查(1/4),含
    天然氣水合物地層的構造與沉積特徵研究. 經濟部中央地質調查所報告,第
    93-24-E 號,2004
    陳松春:地球物理技術在天然氣水合物調查之研究. 經濟部中央地質調查所, 2008.
    劉家瑄:台灣西南海域天然氣水合物地球物理先期調查研究計畫. 經濟部中央地質
    調查所報告, 第 92-11 號, 共 80 頁, 2003.
    Advisor
  • Shu-Kun Hsu(許樹坤)
  • Files
  • 976202016.pdf
  • approve in 3 years
    Date of Submission 2010-06-15

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