多元统计分析方法在南堡凹陷东营组砂岩重矿物物源分析中的应用

利用多元统计分析方法探讨了南北2个物源在南堡凹陷东营组各层段的发育范围。将108个单井样本按照23种砂岩重矿物组分进行Q型聚类,在二维平面图上利用不同聚类间的亲疏关系判断是否来自同一物源,最后在井位图上划分出不同物源发育的范围,并利用ZTR指数以及磁铁矿的递变梯度判断出物源的方向,确定了东营组3个亚段南北2个物源发育的范围,为盆缘耦合分析提供了依据。采用多元统计分析方法可独立完成物源展布和来源的研究,结合其他地质学分析方法,将有助于揭示真实沉积过程,为进一步研究沉积相、储层岩性、物性分析等提供参考。

Multivariate statistical analysis of sandstone heavy mineral provenance in the Dongying Formation, Nanpu Sag

Multivariate analysis is used to explore the developmental range of northern and southern provenances in the strata of the Dongying Formation, Nanpu Sag. 108 single-well samples were clustered according to 23 kinds of sandstone heavy mineral components, and the relationship between different clusters was used to judge whether they came from the same source in the two-dimensional plan. Finally, the conclusions were applied on the well map. The range of development of different provenances was divided, and the ZTR index and the gradient of magnetite were used to determine the direction of the source. The range of development of two provenances in the north and south of the three sub-members of the Dongying Formation was determined, which provided a basis for the basin-edge coupling analysis. Multivariate statistical analysis methods can be used to independently study the provenance distribution and source. Combined with other geological analysis methods, it will help reveal the real sedimentary process and provide reference for further sedimentary faices, reservoir lithology and physical property analysis.