利用分形理论计算相对渗透率曲线——以南襄盆地双河油田核桃园组六油组为例

Fractal theory-based calculation method of relative permeability curves——a case study from the Hetaoyuan Formation in Shuanghe oilfield,Nanxiang Basin

陈田勇 毛鑫 刘仕银 袁珂 彭小东 吴旺林

Chen Tianyong Mao Xin Liu Shiyin Yuan Ke Peng Xiaodong Wu Wanglin

相对渗透率曲线是油藏工程研究的一项重要资料,一般是通过多项式拟合室内岩心实验数据得到。然而受储层非均质性、实验误差以及岩心数目局限性的影响,通过多项式拟合室内实验数据得到的相对渗透率曲线很难代表整个油藏的相渗特征。结合分形理论,根据双河油田实际生产数据,推导出一种新的计算相对渗透率曲线的方法。通过对该油田核桃园组油藏的实例计算,依据油田的生产动态数据与分形理论,得出相对渗透率曲线,并通过含水率进行验证。结果表明,计算得出的相对渗透率较实验测定的相对渗透率更具有整体性和代表性,与油田实际情况吻合较好。该计算方法能够提高岩心实验相对渗透率曲线的可靠性,可以较好地用于油藏的开发实践中。

Relative permeability curve is of great importance in reservoir engineering research,and traditionally obtained through polynomial curve fitting of core data.However,the relative permeability curves obtained using the traditional method cannot reflect the whole picture of oil reservoirs due to reservoir heterogeneity,experimental error and limited core numbers.Based on the Fractal theory,a new method of calculating relative oil-water permeability was derived by using the production data from Shuanghe oilfield,Nanxiang Basin.It was applied in the pay Ⅵ in the Hetaoyuan Formation of Shuanghe oilfield and the calculation results were verified with water cut.The relative permeability curves calculated using the new mothod are more reliable and representative than the results measured in laboratory and can reflect well the real reservoir performance.The new method can improve the reliability of relative permeability from core test and can be applied in reservoir engineering.

10.11743/ogg20120412