本研究利用台灣中油公司計畫在鐵砧山背斜南段淺處地層及台電在彰濱或麥寮地區的鑽井，研究二氧化碳地下封存相關的兩個問題：(1)灌注氣量對現地應力狀態的影響，和(2)灌注二氧化碳誘發地震的關係。計算現地應力所需參數包括：孔隙液壓、地殼上覆荷重壓力、以及最大及最小水平應力大小及方向。針對以上參數我們蒐集井下地層測驗、地層密度電測、滲漏及擠壓水泥試驗資料分別求得區域地層垂直應力、地層壓力及最小水平應力隨深度的分佈，並依據臨界應力斷層的摩擦理論獲得最大水平應力可。利用高解析度井壁的影像電測及傳統的井徑電測，可求得井壁附近最大或最小水平應力的方向。經由搜集二氧化碳儲集岩層及上覆蓋岩層的電測及力學資料和斷層三維幾何形態，配合地質力學的分析，可以定量計算不誘發地震活動情況下，儲集岩層所能容許的最大注入流體的柱高，最後以蒙地卡羅方法評估影響封存層注入氣量各參數的敏感度及情境分析結果。 We intend to study issues associated with CO2 subsurface geologic sequestration using wells drilled by Chinese Petroleum Corporation (CPC) in the southern segment of the Tiehchanshan anticline and by Taipower Corporation in Chanhua near shore area. Two major tasks include: 1) in-situ stress change due to injection and depletion of CO2, and 2) induced earthquakes associated with fluid injection. Parameters needed to calculate in-situ include: pore (or formation) pressure, overburden stress, and the maximum and minimum horizontal stresses, and corresponding data include formation test, mud weight, loss of circulation, density logs, leak-off, gas cut and hydrofrac tests from boreholes will be collected. The maximum horizontal stress can be derived from frictional limit of critically stressed faults. Both borehole wall images (FMI and FMS) and caliper logs are used to infer azimuth of the maximum or minimum horizontal stress. Data of downhole electrical logging and mechanical data of the reservoir and caprock, as well as three-dimensional fault geometry will be composed in the geomechanical analyses. A maximal column height of injected CO2 can be evaluated without compromising the risk of induced earthquakes (or reactivation of pre-existing faults) through sensitivity and scenario analyses of Monte Carlo. 研究期間：10008 ~ 10107
