二氧化碳的排放是造成全球暖化的主要原因之一。為了減緩溫室效應對環境帶來的影響，必須減少二氧化碳排放至大氣中的量，有許多方法可以減少人為二氧化碳的排放，其中最有效的方法為二氧化碳地質封存，地質封存的選項中，又以鹽水地層的二氧化碳封存潛能為最大（可封存二氧化碳量最多，估計全球有0.3~10兆噸的二氧化碳封存量）(IEA, 2001)。
本研究主要目的是利用解析法及數值法，估算T氣田淺部的目標鹽水地層（U構造），所能封存的二氧化碳總量。首先，利用解析法（體積法及壓縮法）對目標鹽水地層（U構造）進行二氧化碳封存量的估算，然後，利用數值法（CMG公司的GEM成分模式）建立U構造的數值模式，完成數值模式的驗證後，利用此數值模式進行二氧化碳封存量的模擬計算，並由數值模擬找出最佳注儲策略，以供現場操作參考。
本研究由解析法所得到的二氧化碳封存量為0.11~6.5億噸，由數值法所得到的二氧化碳封存量為3.43~6.4億噸，另外，數值模擬得到有效封存因子（CC）約為0.53~0.88，此因子可以應用於目標鹽水地層計算有效封存量之用。

Carbon dioxide capture and storage technology (CCS) is an effective method to control the emission of CO2 from source, such as power plant. Geological sequestration of CO2 in a saline aquifer in CCS is currently the most effective way to moderate global warming.
The purpose of this study is to estimate CO2 storage capacity in a saline aquifer of Y-formatio of U-structure in T gas field. Both analytical method and numerical method are used in the estimation.
In using analytical methods, both volumetric and compressibility approaches are used separately to estimate CO2 storage capacity in Y-formation of U-structure. The storage capacity from analytical methods is ranging from 11 to 650 million tons.
In using numerical method, GEM compositional simulator is used. Grid model is set up from inputting the reservoir parameters of the saline aquifer. After checking the validation of the model, simulation studies are conducted for both constant rate injection and constant pressure injection.The storage capacity from numerical method ranging from 343 to 640 million tons. And storage capacity factor is 0.53~0.88, depending on CO2 injecting operations, and location of injecting wells.

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