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| 渤海湾盆地垦东凸起北坡新近系馆陶组上段沉积相模式探讨 | |
| 引用本文： | 鹿洪友,袁静,陈小宏,杨鹏飞,郭玉新.渤海湾盆地垦东凸起北坡新近系馆陶组上段沉积相模式探讨[J].古地理学报,2008,10(5). |
| 作者姓名： | 鹿洪友 袁静 陈小宏 杨鹏飞 郭玉新 |
| 作者单位： | 1. 中国石化胜利油田分公司,山东东营,257061 2. 中国石油大学(华东)地球资源与信息学院,山东东营,257061 3. 中国石油大学(北京)CNPC物探重点实验室,北京,102249 |
| 基金项目： | 国家科技攻关计划 |
| 摘 要： | 主要通过岩心观察、粒度分析、参数计算、录井及测井分析等手段,充分吸收国内外河流研究成果,结合研究区区域地质背景,总结出渤海湾盆地垦东凸起北坡新近系馆陶组上段沉积相模式。研究认为：馆上段为河流相沉积,从沉积物特征和平面形态角度可以将研究区馆上段河流理解为介于辫状河与曲流河之间的过渡河型。其平均河道弯曲度大于1.7,垂向层序表现为泥多砂少,具有曲流河的特征;但沉积层序顶部常直接覆盖河漫/洪泛平原沉积,特别是河道内砂坝发育造成河道分汊河,砂坝沉积物粒度特征反映的受洪水控制的震荡性特点而与曲流河有重要差别。作者借用在水利学界和地貌学界广为使用的分汊河概念,建立了馆上段沉积相模式,包括河床、堤岸、河漫/洪泛平原和废弃河道等4个亚相,其沉积物组成下粗上细的正韵律。其中,河道砂坝是其主要砂体,顶部常被洪泛平原直接覆盖;决口扇是仅次于河道砂坝的次要砂体。 |
| 关 键 词： | 渤海湾盆地 垦东凸起北坡 新近系 馆陶组上段 相模式 分汊河 |
Investigation of sedimentary facies model of the Upper Member of Guantao Formation of Neogene on northern slope of Kendong uplift in Bohai Bay Basin |
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| Lu Hongyou,Yuan Jing,Chen Xiaohong,Yang Pengfei,Guo Yuxin.Investigation of sedimentary facies model of the Upper Member of Guantao Formation of Neogene on northern slope of Kendong uplift in Bohai Bay Basin[J].Journal of Palaeogeography,2008,10(5). | |
| Authors: | Lu Hongyou Yuan Jing Chen Xiaohong Yang Pengfei Guo Yuxin |
| Abstract: | The sedimentary model of the Upper Member of Guantao Formation of Neogene on the northern slope of Kengdong uplift in the Bohai Bay Basin was established based on core observations, granularity data, parameter calculation, drilling and logging data, combined with the domestic and foreign research results regarding fluvial facies. The investigation indicates that the Upper Member of the Guantao Formation in the study area was of fluvial deposition, and it could be determined as the transitional fluvial type between braided fluvial and meandering fluvial according to the sediment characteristics and the planar distribution. The average curvature of the channel is more than 1.7, and the vertical sequence is characterized by meandering fluvial deposits with higher content of mudstone and lower content of sandstone.The top of the sequence usually overlied the flood plain deposits directly. In particular the channel anabranched fluvial was formed due to the development of the sandbar in the interior of the channel. The granularity characteristics of the sandbar sediments show great differences from the meandering fluvial facies, that is, it is controlled by flood. In this paper, the sedimentary model for the Upper Member of the Guantao Formation was established in terms of the anabranched fluvial concept which is widely used in hydraulics and topography. The subfacies include fluvial bed, bank, floodplain, abandoned channel which constituted a fining upward normal cycle. The channel sandbar is the main sandbody and is usually directly overlain by floodplain deposits. The crevasee fan sandbody is the secondly favorable one to the channel sandbar. |
| Keywords: | Bohai Bay Basin northern slope of Kendong uplift Neogene Upper Member of Guantao Formation facies model anabranched fluvial |
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