变异函数在薄互层砂体研究中的应用

The Application of Variogram to Study the Scale and Direction of the Thin Interbedded Sandbody

大庆外围油田葡萄花油层以薄互层储层为主 ,砂体规模及展布方向的预测难度大 ,统计密井网条件实验变异函数拟合出的理论变异函数 ,不但可以分析密井网区块的单砂体规模和展布方向 ,而且可以分析密井网区块的叠合砂体规模和展布方向。在地质条件相似、钻井资料较少的区块进行地质建模时 ,还可以直接借用其理论变异函数进行统计计算单砂体和叠合砂体的规模和展布方向。利用葡西试验区 33口井的资料 ,计算沿井排和垂直井排方向的变异函数 ,并拟合出变异函数的理论模型 ,最后 ,通过套合结构分析的方法研究单砂体及叠合后砂体的规模及展布方向。

The Putaohua oil bed is dominated by the thin interbedded reservoir on the margin of Daqing oilfield. It was very difficult to predict sandstone scale and spread direction.Theory model of variogram can analyze the scale and spread direction of single sandbody as well as superposition sandbody in the developed field. When 3D geology model that is similar geology condition and less information of wells is established,the theory model of variogram in the developed field can be borrowed to obtain the sandbody scale and spread direction.Using the data of 33 wells in Puxi testing area,the variogram along and plumbing with well array direction is obtained,then theory model of variogram is modeled,finally,through combinational structure analysis,the scale and spread direction of single sandbody as well as superposition sandbody have been studied.The result using the variogram to study the scale and spread direction of the thin interbedded sandbody is as similar as the result using the general method to do.