Depositional Features and Controls on Gravity Flow Channel of Dongying Formation of Paleogene System, Zhanhua Sag, Jiyang Depression, Shandong Province

• 责任者：Li Shunming (Research Institute of Petroleum Exploration and Development ; PetroChina ; Beijing 100083 ; China) ; Shen Pingping
• 刊名：Acta Sedimentologica Sinica
• 出版年：2010
• 卷期：28(1)
• 关键词：砂体 ; sand bodies ; 重力流 ; gravity flows ; 济阳坳陷 ; Jiyang Depression
• 页码：p.83-90
• 图表：9 illus., 24 refs.
• 分类号：1003
• issnNo：ISSN1000-0550
• isbnNo：CN62-1038/P

Sandstones of the lower member of Dongying Formation of Paleogene system in Zhuangxi oilfield, Zhanhua sag, Jiyang Depression are of string-belt shaped extension. It is considered that the sandstone of lower member of Dongying Formation was deposited by slumping-typed gravity flow-turbidity current channel of long distance sediments source in the semi-deep to deep lacustrine environment with the confine of lacustrine bottom configuration. The sedimentary sources were from the fan-deltas, sub-lacustrine fans in Chengdao area in the northern part. The turbidity channel was subdivided into three types of microfacies: central channel, channel margin, and subaqueous overflow. The external controls on the slumping-typed turbidity current channel in study area is of the long term base level fall caused by volcanic eruption, episodic activity of faults controlled basin, the internal controls of the abundant sediments source, stepped faults perpendicular to the long axis of faulted basin, and negative lacustrine bottom configurations. A depositional model of tubidity current channel is established.