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侧积交错层——辫状河道的主要沉积构造类型 预览 被引量:51

LATERAL ACCRETION CROSS-BEDDING:THE MAIN TYPE OF SEDIMENTARYSTRUCTURES IN THE BRAIDED CHANNEL
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摘要 侧积交错层是砂体侧向迁移加积所形成,在辫状河道砂体中特别发育,其特点:(1)层系的整体形态呈板状,而细层呈“S”形弯曲,向上,向下收敛明显;(2)侧积交错层的某些细层内部可见次一级的前积交错层及滑塌构造;(3)层系厚度与沉积物粒度无关;94)同一层系内各细层的厚度,层分和粒度有较大差异;(5)细层倾向垂直于区域古流内。 Lateral accretion cross-bedding results from lateral accretion of sandbodies induced bythe lateral migration of channels and is very abundant in the braided channels. Its characteristics are: ① the overall shape of its sets is tabular, but its laminae are sigmoid, clearlyconverging both upward and downward. ② there is secondary cross-bedding or crosslaminations as well as slump structures in the inner part of some 'laminae'. ③ the setthickness has nothing to do with the grain size of the sediments. ④ the thickness, grainsize and composition of each lamination within the same set are significantly different eachother. ⑤the laminae dip is at approximate vertical angles to palaeocurrent direction. Thelateral accretion cross-beddings are very abundant in the braided channel as there are moretransverse circulation flows in it and more sand and less mud in the sediments.
作者 李维锋 高振中 Li Weifeng;Gao Zhenzhong;Peng Detang(Jianghan Petroleum Institute, Hubei 434102)
出处 《石油实验地质》 CAS CSCD 北大核心 1996年第3期 298-302,共5页 Petroleum Geology & Experiment
基金 “八五”国家重点科技攻关项目
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参考文献4

  • 1里丁 H G,沉积环境和相,1986年 被引量:1
  • 2尤联元,第三届河流泥沙国际学术讨论会论文集,1983年 被引量:1
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  • 4瑞内克 H E,陆源碎屑岩的沉积环境,1979年 被引量:1

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