微观组分聚类分析在物源体系恢复中的应用——以民丰洼陷沙三段中亚段为例

物源分析是盆地研究的一项重要内容，在有利储层预测和油气田勘探中具有重要作用。不同物源区形成的母岩及沉积环境存在差异性，致使各物源区沉积物组分在微观特征上存在差异。选取民丰洼陷沙三中亚段沉积物特征元素比值和重矿物含量作为研究的样本，采用聚类分析方法对物源体系进行研究。首先，在对特征元素指标进行优选的基础上，通过对沉积物特征元素比值进行Q型聚类分析，精确刻画了不同物源体系的范围；其次，对沉积物重矿物含量进行R型聚类分析，恢复了不同物源区的母岩类型。研究表明：洼陷主体区主要受来自青坨子地区的永安镇三角洲和南部的东营三角洲影响。分析结果与宏观的沉积学特征一致，证明该方法可以有效地判断沉积物的物源方向。

Application of Clustering Analysis of the Micro Components in Provenance System Recovery: A Case Study on the Middle Part of the Third Member of the Shahejie Formation in the Minfeng Sag

The analysis of sediment source is an important part of basin research,and it plays animportant role in favorable reservoir prediction and oil exploration.The parent rocks from differentprovenances and the difference of sedimentary environment caused differences in the micro characteristicsof sediment components from different provenances.The authors choose the characteristic elements andheavy minerals content of the middle part of Third Member of Shahejie Formation in deposit of Minfengdepression as a sample,study the provenance system by the clustering analysis.First,based on theoptimization of the trait element ratios,the scope of each provenance system was accurately defined byQ-mode cluster analysis for trait element ratios;Second,the types of parent rock was recovered by R-mode cluster analysis for heavy minerals content.The study shows that the main zone of depression wasinfluenced by the delta of Yonganzhen in Qingtuozi area and the delta of Dongying in the south.Theanalysis result was consistent with sedimentology features,indicate this method could be used effectively in estimating source direction of sediment.