东营凹陷南坡沙三段坡移扇沉积特征

Sedimentary characteristics of the slope-moving fans in the third member of Shahejie Formation on the southern slope of Dongying Depression

目前,东营凹陷南坡沙三段已钻遇到坡移扇这一新型的岩性油气藏类型,但是对坡移扇的地质认识较浅,且其识别特征尚不明确,从而制约了坡移扇勘探的进程。通过大量的岩芯精细观察和描述,统计分析了大量实验数据,在结合地震资料分析的基础上,系统总结坡移扇有别于浊积岩的沉积特征等识别标志。分析认为,坡移扇的形成受三角洲的规模和建设性、构造坡度或沉积坡度、构造运动及湖平面变化等因素所控制。

At present, the third member of the Shahejie Formation on the southern slope of Dongying Depression has penetrated a new lithological reservoir type of slope-moving fans, which has attracted much attention of geologists. However, the poor understanding of these slope-moving fans as well as their unclear identification features have restricted the exploration progress. Therefore, with plenty of precise core observations, this study conducted statistical analysis of massive experimental data, and systematically summarized their u- nique sedimentary characteristics different from turbidities based on analysis of seismic data. It is considered that the formation of slopemoving fans is controlled by the scale and construetivity of delta, slope angle, tectonic movement and variations of lake levels.