本研究的研究目的是利用岩樣資料及最佳化分析法推求油-水界面經驗式之參數後，再利用所得之經驗式計算儲油層的油-水界面之位置（深度）。所得之油-水界面位置可供研究造成生產井出水的可能原因，解決出水問題的重要資訊。另外，油-水界面也是估算油層蘊藏量的重要參數之一。

　　本研究是利用含水飽和度分析法、傳統電測分析法、地層因子比對法及液體界面分析法來計算油-水界面位置。所使用的電測資料包括自然電位（SP），自然加瑪（Gamma Ray），地層電阻（含深測徑電阻井測，中測徑電阻井測及淺測徑電阻井測等），密度、聲波、中子、井徑及岩性密度電測（PEF）等電測資料。

　　本研究是利用最佳化法求出上述各種油-水界面分析法中的方程式之參數，換言之，利用鑽井所得之岩樣資料（包括含水飽和度及孔隙率）為標準值或已知值，由最佳化法利用電測資料，求出計算油-水界面的各種方法中的每一個經驗式之常數值，再利用這些的經驗式分析現場的資料。

　　本研究是以G油田中G-1井的岩樣資料（含水飽和度及孔隙率）為標準，利用最佳化法先計算各種估算油-水界面分析法中的經驗方程式之常數值後，再計算G-1井的油-水界面。以液體界面分析法為例，其結果與地質資料研究所得之油-水界面的結果相當接近。

　　本研究利用G-1井的岩樣資料所得各種估算油-水界面分析法的經驗方程式之常數值之後，應用於G油田中的B-24、B-25及B-2井，分析計算各井之油-水交界面之位置。比較四口井的油水界面，得知油水界面深度北方較深，南方較淺，造成傾斜。

　　The purpose of this study is to use well logging data and the best-fit method to estimate tortuosity factor, cementation factor, saturation factor and depth of oil-water contact. The results of this study can be applied for solving the water producing problem in the operation of reservoir and for estimating parameters of reserves.
　
　　In this study, the depth of oil-water contact in the formation is estimated from Water Saturation Analysis, Resistivity Log Analysis, F-overlay Method and Fluid Contact Equation Analysis. The well logs used in this study include Spontaneous Potential, Gamma Ray, Porosity, Formation Resistivity, and photoelectric effect to determine fluid contact zone.

　　Well logging data of G-1 well is analyzed in this study to calculate the fluid contact. We have derived the parameters such as, tortuosity factor, cementation factor and saturation factor from the core sample of G-1 well. Then the log data of B-24, B-25 and B-2 wells of G field are analyzed to estimate oil- water contact. From the results obtained, the oil-water contact is deeper in the north than in the south.

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