复合点坝构型样式分类方案及分布概率统计*

复合点坝储集层内部非均质性分析是曲流河研究的难点,仅靠地震和测井资料难以解释清楚。关于复合点坝储层构型表征也较缺乏定量化指导标准。本研究选取了13条曲流河河段的260个复合点坝作为数据样本,进行参数分类统计,形成曲流河复合点坝地质知识库。将复合点坝分为4大类、25个亚类;将侧积体分为8大类、22个亚类。统计不同类型复合点坝和侧积体构型样式的分布概率关系。以此为基础,充分利用定量分布概率关系,达到在资料较少情况下分析复合点坝储集层平面非均质性的目的。

Classification scheme and distribution probability statistics of composite point bar architectures

The analysis of heterogeneity within the composite point bar reservoirs is difficult in the study of meandering river sediments,and it is difficult to be explained clearly by seismic and well logging data alone. There is also a lack of quantitative guidelines to characterize the architecture of the composite point bar reservoirs. In this paper,260 composite point bars in 13 meandering rivers are selected to carry out parameter classification and statistics to build a geological database of composite point bars. Composite point bars are divided into 4 categories and 25 subcategories,and lateral accretion bodies are divided into 8 categories and 22 subcategories. The distribution probability relationship between different types of composite point bars and lateral accretion bodies is calculated. On this basis,the quantitative distribution probability relationship is then fully used to analyze the planar heterogeneity of the composite point bar reservoirs with limited data.