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断陷盆地陡坡带扇三角洲模拟及沉积动力学分析 预览 被引量:15

THE SIMULATION AND SEDIMENTARY DYNAMIC ANALYSIS OF FAN DELTA IN THE STEEP SLOPE OF FAULT BASIN
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摘要 通过水槽实验模拟断陷盆地陡坡带扇三角洲的形成过程及其发育,剖析其沉积动力机制和内部结构特征.结果表明,扇三角洲平原、前缘斜坡和前扇三角洲3个亚相沉积动力机制不同,导致各相带的扇面坡度和粒度分布特征明显不同.扇三角洲平原以水流推力作用为主,沉积物以滚动、跳跃方式搬运,粒度最粗;前缘斜坡以重力作用为主,沉积物顺坡向下滚动、沉积,粒度略细,且具有明显的正粒序特征;前扇三角洲以浮力作用为主,沉积物为悬移质沉降,粒度最细.整体上,扇三角洲的形成是一个沉积物不断前积和垂向加积的过程,湖平面变化不同,二者作用强度不同,致使扇体形态有所差异,但扇面各部分基本维持相对固定的坡度,且沉积物的整体粒度分布趋势一致. The formation and characteristics of a fan delta in the steep slope of a fault basin are simulated through flume experiments. It is found that the plain, the front slope and the prodelta of the fan delta have different sedimentary mechanisms, leading to different surface gradients and grain size distributions. In the fan delta plain, the sediments, with relatively large grain sizes, jump forward with the thrust of water flow, while, in the front slope, the sediments have relatively small grain sizes, weltering and depositing along the slope under the force of gravity, forming typical normal grain size gradation. In the prodelta, the fine sediments spread around with the help of floatage and settle down under the force of gravity. So, it is the sustaining progradation and vertical accretion of sediments that build the whole fan delta. The experiment shows that the water level change controls the rate of the progradation and vertical accretion, resulting in different fan delta configurations. And each part of the fan delta keeps the fixed surface gradient, and the sediments have the same grain size distributions.
作者 程立华 陈世悦 吴胜和 鄢继华 姜在兴 王建伟 刘云兰 CHENG Li-hua, CHEN Shi-yue , WU Sheng-he , YAN Ji-hua, JIANG Zai-xing , WANG Jian-wei , LIU Yun-lan (1 Faculty of Geoscience & Information Technology, University of Petroleum, Beijing 102249, China; 2 Faculty of Geo-Resource & Information, University of Petroleum, Dongying 257061 ,China; 3 Huanxiling Oil Production Plant, Liaohe Oil Field, Panjin 124114, China; 4 Geological Institute of Dongxin Oil Production Plant, Shengli Oil Field, Dongying 257094, China)
出处 《海洋地质与第四纪地质》 CAS CSCD 北大核心 2005年第4期 29-34,共6页 Marine Geology & Quaternary Geology
基金 科技部专项基金
关键词 断陷盆地 沉积动力机制 扇三角洲 水槽实验 flume experiment lsedimentary mechanism fan delta fault basin
作者简介 程立华(1977-),男,博士生,从事储层沉积学研究,E-mail: oceanclh@163.com
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参考文献13

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