- 期刊
二氧化碳封存之有效性評估與洩漏模擬－以永和山場址為例
The Leakage Simulation and Effectiveness Assessment of Carbon Dioxide Sealing - a Case Study of Yonghe Mountain
摘要
為因應全球暖化氣候變遷，近年來針對二氧化碳減量及封存的研究相繼提出。二氧化碳封存的方法包括礦化封存與地質封存方法，其中又以地質封存法為施行的一步驟，倘若封存場址之地質封閉性不佳，將導致洩漏的情況產生。本研究採用永和山場址之岩性與地層資料，以TOUGH2中ECO2M模組進行數值模擬來探討蓋岩層封閉之有效性。研討蓋岩層因地殼活動產生斷層或裂隙，導致二氧化碳產生之洩漏棲移，研究洩漏過程中因地層封閉性不佳，造成之逸散速率出現快慢交替之自我促進與自我抑制現象。模擬結果指出，當一個封閉性良好之蓋岩層可有效封存二氧化碳約3,000年以上；在蓋岩層有破裂的情況下，約100年後就可於觀測點中觀測到大量二氧化碳的逸散情況。而二氧化碳移棲的過程中觀測到逸散速率之自我促進與自我抑制交替之現象，可作為地層封存有效性降低之指標。
並列摘要
In response to global warming, many carbon dioxide sequestration methods have been proposed in recent years. The most widely used method is the geological storage. In this paper, the lithology and stratigraphic data of the Yonghe Mountain site are used in the ECO2M module of TOUGH2 to evaluate the effectiveness of geological storage two cases are simulated. One is when the cap rock is well closed, the second case to simulate the leakage of the carbon dioxide if it penetrates cap rock through the rupture caused by the fault or fracture. The physical mechanism of the phenomenon is explored for the leakage rate of carbon dioxide which shows self-enhancement and self-limit due to the incomplete sealing of the geology. The results show that carbon dioxide below a well-closure cap rock can be stored more than 3,000 year. On the other hand, in the case with rupture in the cap rock, carbon dioxide leakage can be observed for fewer than 100 years. The leakage rate shows the phenomenon of self-enhancement and self-limit. This can be used as an indication for the reduction of sealing efficiency of cap rock.