Sedimentary Characteristics and Model of Gravity Flow Deposition in the Depressed Belt of Rift Lacustrine Basin: A Case Study from Dongying Formation in Nanpu Depression
详细信息
- 责任者：Xian Benzhong (State Key Laboratory of Petroleum Resource and Prospecting ; Beijing 102249 ; China) ; Wan Jinfeng
- 刊名：Earth Science Frontiers
- 出版年：2012
- 卷期：19(1)
- 关键词：重力流沉积 ; gravity flow deposit ; 沉积相模式 ; sedimentary facies model ; 南堡凹陷 ; Nanpu Sag
- 页码：p.121-135
- 图表：12 illus., 2 tables, 38 refs.
- 分类号：0803
- 出版序号：20130201
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
Sedimentary characteristics and depositional model of Dongying Formation in depressed belt of eastern Nanpu Depression were studied based on core,grain size and logging data. Interpretation results showed that the gravity flows’ sediments included fine sandstone and siltstone with an average thickness of 2.94 m and a maximum thickness of 9.5 mfor a single bed. Among them, there were 22 single sandstone beds with over 3mthickness,which had a total thickness of 107.5 m. Basically, the sediment gravity flows were sprung by sediments’ slump on the delta front slope in studied area. During the processes, earthquake movements and intermittent volcano eruptions, besides natural sediments slump when the angle of delta front slope overrun the critical slope angel, brought the key dynamical mechanisms.
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