2007-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681417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，以在下一階段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，以及儲量之估算。本計畫在頭三年的執行過程中已完成了接近10,000平方公里區域性震測普查、海底地震儀與地熱調查技術之建立、試驗與分析能力之發展，以及建立區域性的地球物理、地質構造與沈積特性等工作，另外並在兩處BSR密集分布地區進行震測與海底地震儀精查作業。所有收集來的資料及分析結果均置入本計畫建置的台灣西南海域天然氣水合物資料庫，並建立了以地理資訊系統(GIS)為架構的資料庫網頁與查詢系統。本第四年度的工作重點在於整合與分析計畫前三年所收集來的各項資料，以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等重要資訊，確切掌握探勘好景區內天然氣水合物之分布與特性。本年度中並將發展天然氣水合物儲量評估技術，以便推估最有潛力開發之探測好景區中天然氣水合物之可能儲量與能源潛能。 96年度計畫將由國內八位學者專家合作，進行之調查研究工作包括： 1.在九龍甲烷礁地區進行反射震測普查作業，以了解該地區天然氣水合物之分布情形。 2.彙整反射震測普查及海底聲納迴聲剖面資料，加上其他地球物理與地質、地球化學資料進行區域性之整合研究分析，並建議三個最有潛力之鑽井調查地點。 3.處理、分析海底地震儀資料，結合反射震測與OBS資料來推估精查區天然氣水合物的可能儲量。 4.進行地熱量測，協助天然氣水合物穩定基底深度之研究。 5.區域性沉積架構及含砂地層分布之研究。 6.天然氣水合物系統建<br> Abstract: This proposal requests the 4th 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 are used to map the gas hydrate distribution in the study area, to understand the regional structures and deposition styles, to investigate the characteristics of gas hydrate bearing sediment, and to estimate the amount of gas hydrate in place and its energy potential. Gas hydrate prospects will be selected in the 4th year for future drilling investigation that may be conducted in the 2nd phase (2008-2011) of this gashydrate program. During the first 3 years of this project, regional geophysical reconnaissance surveys and 2.5D seismic surveys plus OBS experiments have been conducted to map the regional gas hydrate distribution and local characteristics. Compilation and analyses of geophysical and geological data have been performed to establish the regional geophysical characters, geological structures, and sedimentary patterns of both the accretionary wedge province and the passive China continental slope regions in the study area. Special geophysical investigation techniques, such as ocean bottom seismometers, heat flow measuring devices, deep-tow magnetometers, etc., have been established and tested, seismic data processing, analysis and interpretation systems have also been purchased and installed. Regional sedimentary deposition history and structural patterns have been proposed. In the 4th year of this project, integrated approach on analyzing all the geophysical, geological and geochemistical data is emphasized. “Petroleum system” approach will be used 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 be the prime objectives of this year’s studies. A summary report of this 4-year program will be prepared by the end of this year. Major investigation work proposed for the 4th year include: 1.Integrations of geophysical data collected during the first 3 years. 2.2D seismic reflection survey in the Jiulong Methane Reef area. 3.Using new heat flow devices to conduct heat flow measurements while collecting piston core samples, also to analyze regional heat flow data. 4.Regional seismic stratigraphy studies, focusing on sand distribution and transporting. 5.Establish the structural and sedimentary characters of hydrate bearing sedimentary layers, and related “gas hydrate systems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