A井区J_1b_(4+5)油藏水淹层定量解释方法研究

The study on quantitative interpretation of water-flooded layer in J_1b_(4+5) reservoir of A well area

针对A井区J1b4+5储层岩性复杂,非均质性强的特点,采用了分岩性解释的方法。利用多元回归模型解释含水饱和度,避免了求取地层水电阻率的问题;通过归一化的方法,拟合出油水相对渗透率的计算公式,进而求取储层的产水率;根据毛管压力曲线,采用J函数和沃尔公式法来计算储层原始含油饱和度,并在此基础上构建水淹敏感参数-饱和度下降指数。采用三个特征参数的组合来定量评价水淹级别,应用于研究区新井解释中,取得了较好的应用效果。

According to the characteristics of complicated lithology and serious heterogeneity in J1b4＋5reservoir of A well area,this paper used the method of lithology-baded interpretation.Using the multiple regression model to computer the water saturation,and avoiding the problem of evaluating formation water＇s resistivity.Fitting the calculation formula of oil and water＇s relative permeability by means of normalization method,and then calculating the water production rate.According to the capillary pressure curve,the J function and the wall formula method are used to calculate the initial oil saturation of the reservoir,based on it, this paper structures the water-flooded sensitive parameter-the desaturation index.Using the combination of three characteristic parameters to quantitatively evaluate the water-flooded level,which is applied to the interpretation of the new wells in the study area, and good results have been achieved.