地质条件约束下储层流动单元定量研究

QUANTITATIVE RESEARCH ON THE FLOW UNIT IN RESERVOIRS RESTRICTED BY GEOLOGIC FACTORS

由于流动单元定量研究中常用的数学方法不能反映储层的地质分布规律,采用了地质条件约束的研究思路,对塔中油田塔中11油藏志留系潮坪相储层进行了流动单元研究.在应用高分辨率层序地层学进行小层对比的基础上,首先确定储层内部的渗流屏障及连通体的分布规律,然后在连通体内部,综合采用基于孔渗的宏观参数FZI和微观参数R35建立流动单元的聚类样本和判别函数,对所有取心井和非取心井划分出流动单元类型.最后根据单井划分结果,在储层结构模型的约束下,优选随机建模方法对流动单元的分布进行横向预测,建立了流动单元分布的三维模型.实践证明,渗流屏障和连通体等地质条件控制下流动单元定量研究方法在潮坪相地层中有很好的应用效果.

The conventional method for flow unit study based only on applied statistics, which neglects the complexity of geological variety, is inaccurate. A new multistep method of determination of flow units is applied in tidel-fiat reservoirs in Talimu ollfield. Based on the construction of the high resolution sequence stratigraphic framework, the first step is to differentiate flow barriers from connected sandbodies. Then a clustering sample and a criterion function of different flow units are constructed according to two parameters （FZI and R35 ） and the distribution of flow units. With the results of well partition, a three-dimensional model of flow units was built up under the restriction of connected sandbodies. The example shows that the method of multistep flow unit study can be suitably applied in tidel-fiat facies strata.