摘要
以北京市通州区白庙现代潮白河沉积体为例,通过对深挖探槽、探坑和野外剖面的详细解剖,结合密集采样的分析结果,研究现代潮白河白庙沉积体的内部岩石类型、沉积相类型及沉积模式,同时分析沉积粒度较粗的决口扇沉积.结果表明:白庙潮白河现代沉积体是一个曲流河沉积体;岩石类型主要包括细砾岩(泥砾为主)、中细砂岩、泥质粉砂岩和粉砂质泥岩,发育块状层理、槽状交错层理、平行层理和板状交错层理等;工区河流沉积体发育3种亚相(河床亚相、堤岸亚相和河漫亚相)和5种微相(河床滞留沉积微相、边滩微相、天然堤微相、决口扇微相和河漫滩微相).这些沉积微相构成白庙沉积体内部3套沉积序列.
A detailed study of rock facies,sedimentary facies type and depositional model of modern Chaobai river in Baimiao( Tongzhou district in Beijing) have been conducted by digging deep trenches,pits and field profile.At the same time,a detailed analysis of crevasse splay,which is composed of coarse sediment grain,has also been made.It is shown that Baimiao sedimentary body is a meandering river sedimentary body.Rock types mainly include fine conglomerate (gravel-based mud),fine-grained sandstone and muddy siltstone and silty mudstone.Massive bedding,trough-shaped cross bedding,parallel bedding and tabular cross bedding also developed well in work area.Three subfacies have developed and they are riverbed,embankment and floodplain sub-phase.Five kinds of microfacies named riverbed,point bar,levee,crevasse splay and floodplain microfacies were found and these sedimentary facies constitutes the three Baimiao sedimentary sequence.
出处
《大庆石油学院学报》
CAS
北大核心
2010年第2期7-10,共4页
Journal of Daqing Petroleum Institute
基金
国家科技重大专项项目(2008ZX05009-002)
关键词
现代沉积
潮白河
岩相
沉积模式
决口扇
modern sedimentation
Chaobai River
lithofacies
depositional model
crevasse splay
