2004-02-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681472摘要：要辯識天然氣水合物在海床下的分布以及推估其蘊藏量，震測是最經濟、快速且有效的調查研究技術。為整體評估台灣西南海域天然氣水合物之分布與儲量，本計畫將以海研一號最新收集處理完成的震測資料為基礎，將震測調查範圍向西南方向擴展，以期涵蓋高屏峽谷以西水深兩仟公尺內之區域，另以台大海洋所過去所收集之震測測線資料與海底底質聲納迴聲剖面資料為輔助，作為測繪西南海域天然氣水合物全面分布狀態之依據，以掌握調查區域內天然氣水合物的確切賦存分布狀態，並提供資源潛能評估、鑽探目標區震測精查以及海底岩心採樣站位規劃之依據。除了完成區域性的震測普查與海底底質聲納迴聲剖面資料的收集外，海上作業亦將配合海底地震儀（OBS）實驗在一處有明顯海底仿擬反射（BSR）的構造高區進行反射震測精查實驗。其目的在於提供調查地區更精確的構造與天然氣水合物分布資訊，同時也作為未來進行三維震測精查作業之演練。總體而言，反射震測作業在本計畫中扮演關鍵性的角色。從第一階段的普查到第二階段的三維震測精查，再到井位地點的地球物理精查，逐步瞭解調查地區天然氣水合物之分布與賦存狀態，精確掌握探勘好景區的地質構造與天然氣水合物移棲變化。<br> Abstract: Seismic reflection technique presently is the most economic, efficient and effective method in identifying the distribution of gas hydrate and estimating the amount of gas hydrate beneath the sea floor. In order to evaluate the overall distribution and the amount of gas hydrate in-place in the area offshore southwestern Taiwan, this project intends to expand the seismic survey coverage from the previous gas hydrate survey lines southwestward to cover the Kaoping slope and the Chinese continental slope area to water depths of 2000 m. In addition, this project will also compile and examine the sub-bottom profiling (3.5 kHz or chirp sonar) data to provide high-resolution images of shallow sea floor sediment distribution for better constraining the distribution of gas hydrate. The seismic reflection data collected will be used to evaluate the energy resource potential of the region, and to pin-point a few “sweet spots” for coring, high-resolution surveys, and possible future drilling targets. Besides regional seismic survey, this project will also collect a small 3D seismic data set in a selected area where ocean bottom seismometer experiment will be conducted simultaneously with the 3D seismic reflection survey for the purpose of providing better velocity and structural controls to the structures and gas hydrate distribution of the survey area, and to gain experiences for the future 3D seismic surveys. In fact, seismic reflection investigation plays a vital role in this integrated gas hydrate investigation program of the Central Geological Survey. Not only the seismic reflection data could be used to map the distribution of the gas hydrate, it could also provide critical information for coring and future drilling sites selection, and for gas hydrate volumetric estimation.天然氣水合物台灣西南海域地球物理探勘反射震測地層構造沉積環境Gas hydrateOffshore southwestern TaiwanGeophysical explorationGeological structureSedimentary environment