CB地区密闭取心井水淹层饱和度校正方法研究

Research of oil saturation correction methods for water flooded layer in sealing core well of CB area

常压密闭取心过程中因孔隙体积变化、降压脱气等因素会导致油水饱和度损失,对水淹层必须校正饱和度损失量。分析了饱和度校正的四种方法:归一数理公式法、经验公式校正法、实验测量校正法和理论公式计算法,并将其应用于江苏油田CB地区水淹层的饱和度校正。应用结果显示饱和度校正方法的选择与储层的水淹程度有关。校正后的含油饱和度反映了地层真实的剩余油饱和度分布情况,可为改善油藏后期开发效果提供了依据。

In the process of sealing core,the increasing pore volume and degasification by release of pressure will lead to the loss of oil and water. The loss is more for water flooded reservoir and must be corrected. This paper provides four kinds of correction method： normalized mathematical formula,empirical method,laboratory measurement and theoretical equation.These methods were applied to correct the water saturation of water flooded layers in CB area,and the results indicate that different correction methods should be selected by different drowned degree of reservoir. The corrected oil saturation really reflects the distribution of remaining oil,and can provide reliable support to improve the development effectiveness.