关键词: 特征元素, 重矿物, 聚类分析, 民丰洼陷, 物源体系, 沉积学

Abstract:

The analysis of sediment source is an important part of basin research, and it plays an important role in favorable reservoir prediction and oil exploration. The parent rocks from different provenances and the difference of sedimentary environment caused differences in the micro characteristics of sediment components from different provenances. The authors choose the characteristic elements and heavy minerals content of the middle part of Third Member of Shahejie Formation in deposit of Minfeng depression as a sample, study the provenance system by the clustering analysis. First, based on the optimization of the trait element ratios, the scope of each provenance system was accurately defined by Q-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 was influenced by the delta of Yonganzhen in Qingtuozi area and the delta of Dongying in the south. The analysis result was consistent with sedimentology features, indicate this method could be used effectively in estimating source direction of sediment.

Key words: characteristic elements, heavy mineral, cluster analysis, Minfeng sag, provenance system, sedimentology