當礦區的生產量（率）達高峰後，生產率遞降下來之後，如果生產操作條件不變，則可以採用生產遞降曲線分析法預測未來生產率以及蘊藏量；使用傳統作圖法及典型曲線法作實際上生產油氣井的蘊藏量分析時，時常遇到假設條件或邊界條件與實際的現場條件不同，例如：台灣的天然氣生產井大都是產自水驅型的地層。但很少水驅型的典型曲線可供生產資料分析。

　　本研究主要目的是建立水驅型地層產率（或壓力）模式後，利用數值解而繪製數組生產遞降典型曲線。

　　本研究利用電腦模擬軟體Computer Modelling Group Ltd.（CMG）之IMEX軟體，建構出水驅型地層數值模式，將水驅型模式所得產率隨時間變化之結果，以無因次衰減曲線流率（qDd）和無因次時間（tDd），繪製出數組在不同坐標下適用於水驅型地層的典型曲線，以供分析生產遞降資料之用。

　　應用本研究所繪製之典型曲線分析產率遞降資料，可較迅速得到正確的分析結果。

　　When the production rate of the reservoir reach the highest peak, it will start to decline. If the production process resist constant from that time, using decline curve analysis of production rate to predict production rate and reserves in the future.

　　The purpose of this study is to establish water-drive reservoir model and using numerical solution to build up several type curves. The established type curves can be used for analyzing declining production rates of water-drive reservoirs and forecasting future performance of the reservoirs.

　　This study uses IMEX program issued by Computer Modeling Group Ltd. to construct water-drive reservoir model. After transforming the results to dimensionless production rate (qDd) and dimensionless time (tDd), this study constructs several type curves for water-drive model.

　　Using these type curves for analyzing production declining rates of water-drive reservoirs can correctly forecast performance of the reservoirs in the future.

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