蠡县斜坡沙一段混合沉积控制因素

Control Factors of Mixed Sedimentation in First Member of Shahejie Formation in Lixian Slope

蠡县斜坡具有多物源、近物源和多沉积体系的沉积特点,油源条件优越,沙河街组是其勘探主要目的层,而长期被忽视的混合沉积研究正逐渐成为隐蔽油气藏研究的重要方向之一。通过岩心观察发现,研究区的沙一段沉积岩层中普遍发育混积岩,在前人研究的基础上,结合研究区的沉积相分析,对研究区沙一段混合沉积控制因素进行了讨论,并认为以构造活动和气候条件为主,其他影响因素如湖平面升降、物源和水动力条件都受前两者的制约。

The sedimentary characteristics of the Lixian slope are multi-source,near-source and multi-sedimentary systems,and the oil source conditions are superior.Shahejie Formation is the main target layer of exploration,and the long-neglected mixed sedimentation study is becoming a research one of the important research directions.Based on the previous studies,combined with the sedimentary facies analysis of the study area,the mixed deposition control factors of the Shahejie Formation in the study area were discussed.The results show that the tectonic activities and climatic conditions are the main factors,such as lake elevation,provenance and hydrodynamic conditions are subject to the former two constraints.