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儲氣地層氣體組成對二氧化碳封存量影響之研究

Effects of Gas Composition on CO_2 Storage Capacity in Depleted Gas Reservoirs

摘要


本研究主要模擬二氧化碳封存於不同天然氣組成成分的舊氣層(T氣層及K氣層)中:(1)二氧化碳與天然氣混合所產生的流體相態變化;(2)天然氣組成對二氧化碳封存量的影響。其中,T氣層為濕性地層,含C_1至C_7的比例較高;K氣層為乾性地層,CO_2含量約50%。模擬注儲二氧化碳於兩個舊氣層後,可得:(1)天然氣物質平衡法可應用於估算二氧化碳的封存量;(2)由於二氧化碳的氣體偏差因子較天然氣小,因此在舊天然氣層中注儲二氧化碳的體積量會大於氣層所生產出來的體積量;(3)二氧化碳封存量與天然氣之產出量比值(封存比例)會與舊氣層的天然氣組成有關;(4)注儲二氧化碳的流體相圖會漸漸變化成純二氧化碳的相圖。

並列摘要


The purposes are: (1) to observe the phase diagram changes during CO_2 geological sequestration and (2) to evaluate the CO_2 storage volume, in depleted gas reservoirs with different gas composition (T gas reservoir and K gas reservoir). T gas reservoir has higher percentage of C_1-C_7 and K gas reservoir has higher percentage of CO_2. There are some conclusions from numerical simulation results: (1) p/z plot method can be applied for calculating CO_2 storage volume. (2) The gas deviation factor of CO_2 is smaller than the gases in T gas reservoir and K gas reservoir, therefore, CO2 storage volume can bigger than gas produced volume. (3) The gas composition of gas reservoir affects the ratio of CO_2 storage volume and gas production volume. (4) The phase diagrams when CO_2 injected will gradually change into a pure phase diagram of CO_2.

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