Sequence Framework and Sedimentary Facies of Ed Formation in Paleogene, Nanpu Sag, Bohai Bay Basin
详细信息
- 责任者：Guan Hong （China University of Petroleum ; Beijing 102249 ; China） ; Zhu Xiaomin
- 刊名：Acta Sedimentologica Sinica
- 出版年：2008
- 卷期：26(5)
- 关键词：层序地层学 ; sequence stratigraphy ; 沉积体系 ; depositional system ; 东营组 ; Dongying Foumation ; 渤海湾盆地 ; Bohai Gulf Basin
- 页码：p.730-736
- 图表：5 illus., 14 refs.
- 分类号：1200
- issnNo：ISSN1000-0550
- isbnNo：CN62-1038/P
摘要
Comprehensively using the drilling, logging and seismic data, based on the boundary characteristics of the sequence systems tract,sequences of Ed Formation in Paleogene in the area of Nanpu sag were classified. Ed Formations were divided into three sedimentary sequences. By tracing MFS and FFS, lowstand, transgressive and highstand system tracts was ascertained. The basin palaeogeography and fault activity have influenced on framework and distributions of the sequence. On the area of hanging-wall of Gaoliu fault, Ed Formation was thin and eroded hardly,especially in Liuzan region. The centre of sequence thickness was located on Linque sub-sag, thickness is more than 2 500 m. While on the land, average sequence thickness is 1 800 m.Depositional systems were analysis on sequence stratigraphic framework. On the slope region in the northeast, alluvial fan and fan-delta were mainly depositional systems. And braided river-delta, fan delta and delta were distributed in the northwest and south slope. Tectonic activities were critical controlling factors on sequence system boundary; stack mode and distribution of deposition system. Strong active fault make retrogradation mode, and inertia fault make progradation. The favorable lithological traps are located mainly on fan-delta in the lowstand system tracts of sequence-1 and on turbidite fan in the sequence-2.