本論文在國道322.5 K油料污染場址浮油回收案例發現浮油回收與降雨相關。每年雨季來臨後皆使浮油回收速率大於前乾季之回收速率。此現象與石油工程注水激勵產油之水攻法類似。以土壤氣體調查、監測井群地下水位分佈及鑽探土樣浮油厚度，描述浮油分佈狀況界定油料污染場址污染範圍。根據氣象降雨資料應用油水相對滲透率及油水置換理論計算入滲雨水置換土壤中油料之浮油回收速率。由油水置換理論計算結果與歷年現場量測之浮油回收速率數據吻合。驗證置換理論在油料污染場址浮油回收之應用。

Oil leakage occurred at point 322.5K of the National Highway in Taiwan and was discovered in March 1998. Since the discovery, free product recovery started and lasted until June 2000. Field data showed that oil recovery rate correlated with precipitation. Every year the oil recovery rate during rainy season is higher than that of the previous dry season. This phenomenon is similar to the oil recovery by waterflooding used in the petroleum industries. The paper first utilized the data from soil boring, soil gas and monitoring well surveys to build a conceptual model which described the hydrogeology and oil distribution of the site. Oil recovery was then calculated from immiscible displacement theory utilizing the groundwater infiltration rate estimated from precipitation records and the relative permeability estimated from the laboratory core experiments. The oil recovery calculated from the immiscible displacement theory was verified by the field observations.

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