储层建模稳健变差函数的求取

The acquirement of robust variogram in reservoir modeling

杨勇 吴蕾 别爱芳 郭凯

Yang Yong Wu Lei Bie Aifang Guo Kai

中国石油勘探开发研究院, 北京 100083

Research Institute of Petroleum Eexploration and Development, PetroChina, Beijing 100083, China

根据油气储层垂向钻井的物性分布特点,针对奇异值、混合分布和漂移三个主要影响油气储层物性参数稳健变差函数求取的地质因素,选取剔除奇异值、限制特高邻差值、正态变换等方法消除奇异值影响,利用细致分相或截尾处理降低混合分布的影响,通过计算去除趋势后剩余值变差函数的方法处理漂移作用,并提出了油气储层物性参数稳健变差函数求取的工作流程。

According to detailed study on the vertical characters of the petroleum well logs and the three main geological factors such as outliers, mixed distribution and drift which influenced the acquirement of the robust variogram of reservoir petrophysical parameters, the paper used removing outliers, clipping pair data which had extra high difference, data normal transform, and so on to eliminate the effect of outliers, and used facies particular description or tail-cut to reduce mixed distribution influence. The paper also caculated the variogram of the residuals obtained by removing the trend to reduce the drift effect, and at last put foward the working flow of the robust variogram acquirement of petroleum reservoir parameters.