现代潮白河岩相与沉积相特征  

Sedimentary facies and lithofacies characteristics of modern Chaobai River

作　　者：郭岭[1] 姜在兴[1] 徐杰[1] 

机构地区：[1]中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室

出　　处：《岩性油气藏》2011年第1期57-61,共5页Lithologic Reservoirs

基　　金：高校博士点基金项目(编号:200804910004);国家科技重大专项(编号:2008ZX05009-002)资助

摘　　要：以北京市通州区现代潮白河白庙沉积体为例,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,详细研究了现代潮白河白庙沉积体内部的沉积相类型。研究表明,现代潮白河白庙沉积体是一个曲流河沉积体。在现代潮白河白庙沉积体内部,共识别出8种岩相,即块状层理细砾岩相(泥砾为主)、大型低角度槽状交错层理细砂岩相、小型低角度槽状交错层理细砂岩相、同沉积变形层理细砂岩相、平行层理细砂岩相、板状和波状交错层理细砂岩相、薄层块状层理粉砂质泥岩与细砂岩相及块状层理泥质粉砂岩相;主要发育了2种沉积亚相和5种沉积微相,即河道和河漫滩亚相以及河床滞留沉积、边滩、天然堤、决口扇和泛滥平原微相。潮白河白庙沉积体在垂向上共发育了3期沉积旋回,其形成主要受沉积物供给、气候和河岸性质的控制。现代潮白河岩相和沉积相的研究,对于寻找古代曲流河岩性油气藏会有重要的启示意义,同时对潮白河今后的开发利用也具有重要的意义。The lithofacies and sedimentary facies of modern Chaobai River in Baimiao（Tongzhou district in Beijing） are detailedly studied by digging deep trenches,pits and field profile.It is shown that Baimiao is a meandering river sedimentary body.Eight lithofacies are identified,and they are massive bedding fine conglomerate（clay gravel-based）,large-scale low-angle trough cross bedding fine sandstone,low-angle trough cross bedding fine-grained sand-stone,synsedi-mentary distortion bedding fine sandstone,parallel bedding fine sandstone,tabular and wavy cross bedding fine sandstone,thin massive bedding silty mudstone and fine sandstone and massive bedding muddy siltstone.Two subfacies developed and they are river channel and flood plain sub-phase.Five kinds of microfacies named riverbed,point bar,levee,crevasse splay and floodplain developed in Chaobai River in Baimiao.Sedimentary body of Chaobai River developed three sedimentary cycles in vertical and they are controlled by sediment supply,climate and quality of river banks.The analysis of lithofacies and sedimentary facies is significant for finding lithologic reservoir and thedevelopment and utilization of Chaobai River.

关 键 词：现代沉积 曲流河 探槽 潮白河 

分 类 号：TE121.3[石油与天然气工程—油气勘探]