近年來為了減緩全球暖化，控制二氧化碳排放成為國際間重要的議題，其中二氧化碳捕捉與封存(Carbon-dioxide Capture and Storage, CCS）被認定為值得進行的方法。基於成本考量，二氧化碳捕獲最容易的方式是在大型排放源製程中立即補捉，並且就近封存，而封存方法以「地質封存」最為安全，技術也最成熟。 本研究在桃園沿海大潭地區，利用二維及三維高解析度反射震測偵測可能的二氧化碳封存場址，該場址位於大潭火力發電廠附近，地質條件優異，適合作為封存試驗場。本研究使用之高解析度震測尺度遠小於探油工業，但可以獲得相當高解析度及高品質之資料，辨認出精細之地下構造。野外施測參數方面，在二維部分，接收器為 240 波道、間距為 4 米，32 重合；在三維震測方面，則有 288 波道，4m x 8m 之重合方格，16 重合，使用震盪震源車震源，並搭配 40HZ 之接收器。本研究三維震測規畫於未來鑽井之場址上，施測方式為環炸法，該法係將接收器固定在中央不動，而炸點在外環繞炸測，相當適合鑽井場址之調查。本結果解析度可達 4 米，測深至 3000 米，如此高的解析度不僅可以用以解釋地下構造，亦可監測二氧化碳注儲之後的遷移情況。 本研究搭配附近鑽井資料，調查成果顯示：本區蓋層由錦水頁岩扮演，深度約位於880m~1000m (厚度約 130m)；而儲集層則為具有高孔隙率的桂竹林層及南莊層，範圍約於 1010m~1730m(厚度約 720m)。綜合以上條件，本研究區具有適當的蓋層，高孔隙率且相當厚的儲集層以及適中的深度，此區相當適合作為二氧化碳封存之場址。本次大潭震測品質極佳，二維和三維調查結果相當一致，皆可以得到非常細的分層構造，地層約向東南傾斜 2.3 度，這表示如果將二氧化碳注入儲集層，儲氣將會往台灣海峽方向移動，為一極為優異的二氧化碳封存場址。 The reduction of carbon dioxide emission to lessen the global warming has become an important international issue in recent years.The CCS technique(Carbon-dioxide Capture and Storage) is among the most recommended methods.The capture of CO2 during its manufacturing process in the electric power plant and the storage in the adjacent area are considered to be an economical and feasible choice. This research uses the 2D and 3D high-resolution re?ection seismic method to investigate possible CCS sites along the coast in Taoyuan. The site is near the Datan electric power plant and is planned to be a CCS experiment laboratory.The main objective is to detect the proper geologic structure and to prepare the baseline data for the future CCS work. The size of the high-resolution method applied in this study is much smaller than that used in the oil exploration. The obtained high quality and high resolution data can resolve very ?ne structures. The survey parameters in 2D are 4m interval, 240 channels. The bin size in 3D seismic is 8m x 4m, 288 channels. Both 2D and 3D used the Minivibe as a source with 40Hz geophone, and having 30 folds.The 3D seismic survey was conducted around the planned drilling site.A surrounding type of 3D data acquisition was taken with sources at outside and receivers at the center.This method is quite suitable for the drilling site investigation.The structural layer as thin as 4m is able to be detected even under a depth of 3000m. Such a high resolution allows us not only to estimate the structure, but also able to monitor the migration of CO2 after storage. The results of seismic survey after comparing with a nearby borehole data show that : 1)the caprock is Chinshui shale which is at the depth of 880m to 1000m with a thickness about 120m, 2) the Nanchuang formation and Kueichulin formation with high porosity are proper reservoir layers which are located at the depth between 1010m to 1730m.This site possesses good caprocks, thick reservoirs with high porosity and, most important, a suitable depth. This area could be a good CCS site. The results of 2D and 3D surveys are quite consistent. Very ?ne layered structures with dipping angle of 2.3 degrees to southeast are revealed. It means that if the CO2 is injected in the reservoir,it may migrate to Taiwan Strait.
