2005-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681424摘要：本計畫為執行中央地質調查所推動之四年期「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」工作，將以多種地球物理探測技術及分析方法在台灣西南海域進行天然氣水合物之調查與探勘研究，以精確掌握調查海域中天然氣水合物的位置與分布型態，瞭解其與區域性構造以及沈積形態之關係，探討天然氣水合物之資源特性，進行蘊藏量之評估，並在研究海域選擇出最具有開發潛力的探勘好景區進行精密地球物理調查，規劃出最適合之鑽探井位，以在計畫第四年進行鑽井採樣之相關研究，驗證地層中天然氣水合物之物理與化學特性，以及儲量之推估。本計畫在第一年執行過程中已進行了區域性震測普查、海底地震儀與地熱調查技術之建立、試驗與分析能力之建立，以及建立區域性的地球物理、地質構造與沈積特性等工作，另外也建立了以地理資訊系統(GIS)為架構的天然氣水合物資料庫。第二（本年度）將進行在被動大陸邊緣的南海陸坡地區的區域性普查工作，並將依第一年的普查結果，在擇定的探勘好景區進行精密調查，以確切掌握探勘好景區內天然氣水合物之分布、特性。另外，並將採用「石油系統」分析策略，探討台灣西南海域天然氣水合物的生成與移棲環境、地質構造與地層之分布與演化<br> Abstract: This proposal requests the 2nd year support of the 4-year gas hydrate project entitled “Geological Exploration of Gas Hydrate Prospects Offshore Southwestern Taiwan – Geophysical Investigation”. Various marine geophysical exploration techniques will be used to map the gas hydrate distribution in the study area, to understand the regional structures and deposition environment, to investigate the characteristics of the gas hydrate bearing sediment, and to estimate the amount of gas hydrate in place and its energy potential. Gas hydrate prospects will be selected for detailed investigation, drilling sites will be identified and studied, then drilling, coring and gas hydrate sampling will be carried out in the 4th year. During the first year of this project, regional geophysical reconnaissance surveys were conducted to map the regional gas hydrate distribution. Compilation and analysis of geophysical and geological data have been performed to establish the regional geophysical characters, geological structures, and sedimentary patterns of the accretionary wedge province of the study area. Special geophysical investigation techniques, such as ocean bottom seismometers, heat flow measuring devices, etc., have been established and tested, seismic data analysis and interpretation system has also been purchased and installed. Regional sedimentary deposition history and structural patterns have been proposed. In the 2nd year (this proposal period), 2D multichannel seismic reconnaissance survey will be carried out in the passive margin province of the study area to map the BSR distribution of the continental slope region. 2.5D seismic reflection and 2D OBS surveys will be conducted in a selected small area. Then during the 3rd year of this project, detailed geophysical investigations will be carried out in the selected prospects in order to understand how the gas hydrate distribution relates to regional structures and stratigraphy, physical characteristics of the hydrate bearing sediment, possible generation and migration paths of the gas hydrate, and to have a better estimation of the amount of gas hydrate in place. Selection and site preparation of a few drilling sites will also be the prime objectives of the two-year detailed investigations. In the 4th year, major efforts will be put on drilling sites related investigations and coring and sampling related research.天然氣水合物台灣西南海域地球物理探勘反射震測海底地震儀地熱量測地層構造沈積環境Gas hydrateOffshore southwestern TaiwanGeophysical explorationGeological structureDeposition environment