CO2地下封存普遍被認為是能降低溫室氣體之有效對策，歐美、澳洲與北歐均已展開相關規畫研究，地下深層難開採的煤層除可提供CO2地下封存外，且因CO2吸附性已被證實高於CH4，故可藉CO2地下封存同時擠出CBM（Coal Bed Methane）增加能源回收率。然而過程中必需對煤層特性、孔隙率與滲透率等進行探討，方能安全、有效地達成能源增產與CO2地下封存之目的。CO2地下封存之另一重要目標區為昔日已開採之油氣儲集層，西部麓山帶苗栗地區為本省最早的油氣開發區，含有多層中新世至上新世儲集層，提供適切研究素材。為進一步了解未來實際進行CO2地下封存時之地下地層孔隙率與受壓下滲透率之變化，有必要建立以CO2或CH4為carrier gas之高圍壓孔隙率與滲透率檢測裝置，以便持續進行氣體吸附滲流及相關地化分析。本計畫擬組裝YOKO2高圍壓孔隙率與滲透率檢測儀，為確保實驗環境安全無虞，此儀器擬組裝於實驗室已有之通風櫥內。檢測儀組裝完成後，擬採集西部麓山帶苗栗地區之南莊、石底層煤樣及卓蘭、桂竹林、南港湊合層砂岩，分別探討煤樣與砂岩樣之孔隙率、滲透率、成份、組構、裂隙等，研究成果除可確立評估CO2地下封存於特定地層之可行性外，並可利用煤岩有機地化結果對測區沉積環境與生油潛能進行評估解釋。 CO2 sequestration is considered to be the most effective way in lowering GHS emission. Research and field tests had been performed in Europe, Australia and U.S.A. Since the adsorption of CO2 is much stronger than that of CH4, Coal seam can be treated as a target area for both sequestration and enhanced coal bed methane (ECBM) recovery. However, the study of coal porosity and gas adsorption has to start from characterization studies of coal, such as maceral composition and vitrinite reflectance. Another possible target area for sequestration is abandoned oil/gas reservoir, over Miaoli area of the Western Foothill Belt. In order to exam porosity and permeability under confining pressure (up to 70 MPa), facility with CO2 as carrier gas will be equipped in this study. Furthermore, outcropped coal seam samples from Miocene Nanchuang and Shiti Formations, as well as sandstone samples from Cholan, Kueichulin, Nankang Formations will be collected and examined in this study, including their porosity, permeability, mineral (and maceral) composition, fabric and fractures. The purpose of this study is to evaluate the depositional environment plus HC potential in the study area, by studying various characteristics of reservoir rocks. The results of this study will be beneficial in considering the feasibility of GHG sequestration in coal seams or reservoir rocks in the future. 研究期間：10008 ~ 10107
