断陷湖盆萎缩期浅水三角洲沉积演化与沉积模式——以东营凹陷牛庄洼陷古近系沙三段上亚段和沙二段为例
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Depositional Characters and Models of Shallow-water Delta in the Rift Lacustrine Basins during the Shrinking Stage: a Case Study of Upper Submember of Member 3 and Member 2 of Paleogene Shahejie Formation in the Area of Niuzhuang subsag, Dongying Sag
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    摘要:

    本文通过对东营凹陷牛庄洼陷沙三上亚段和沙二段地层沉积体系的划分以及沉积体系与层序格架之间关系的研究,发现在断陷湖盆的萎缩期也可以发育大型浅水三角洲,与坳陷型湖盆浅水三角洲不同的是,它的主要的沉积微相类型、平面形态和砂体展布特征等具有明显阶段性的变化,并且该变化与湖盆体系域的演化有着密切联系。在低位和湖退体系域,三角洲主要发育水下分流河道微相,平面上形态与曲流河类似,有水下决口扇,单砂体厚度较大,但横向连续性差;而在湖进和高位体系域,三角洲主要发育分流河口砂坝微相,平面呈朵页状或舌状,单砂体厚度薄,但横向连续性好。浅水三角洲的形成主要受古物源、古地形、古水深和古水动力强度的共同影响,而构造运动引起的体系域和水深变化是造成三角洲阶段性发育的关键因素。

    Abstract:

    Large shallow-water delta was found in the rift lacustrine basins based on the study of depositional systems, sedimentary characters and sedimentary modles of Es3s~Es2 formation in Niuzhuang subsag, Dongying sag. There are some differences between the shallow-water delta which can be found in the rift lacustrine basins and in the depression lake basins. The style of microfacies, the figure in the plane and the characters of sand bodies changed by phases, and this change is closely related to the system tracts. In the lowstand systems tract and regressive systems tract, the subaqeous distributary channel is the most common microfacies and the delta’s figure looks like the meandering river’s and the subaqeous crevasse splay can be found. The sand bodies are thick but poor continuity. However, in the transgressive systems tract and highstand systems tract, the most common microfacies is distributary-mouth bar and the figure looks like the leaf or the tongue. The sand bodies are thin but continuity. The form of the shallow-water delta is affected by paleoprovenance, paleotopography, paleobathymetry and palaeohydrodynamic. The change of system tract and water depth which caused by tectonic movement is the control factor of the delta’s evolution by phases.

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赵伟,邱隆伟,姜在兴,陈妍.2011.断陷湖盆萎缩期浅水三角洲沉积演化与沉积模式——以东营凹陷牛庄洼陷古近系沙三段上亚段和沙二段为例[J].地质学报,85(6):1019-1027.
Zhao Wei, Qiu Long-wei, Jiang Zai-xing, Chen Yan.2011. Depositional Characters and Models of Shallow-water Delta in the Rift Lacustrine Basins during the Shrinking Stage: a Case Study of Upper Submember of Member 3 and Member 2 of Paleogene Shahejie Formation in the Area of Niuzhuang subsag, Dongying Sag[J]. Acta Geologica Sinica,85(6):1019-1027.

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历史
  • 收稿日期:2010-03-30
  • 最后修改日期:2011-01-07
  • 录用日期:2011-01-11
  • 在线发布日期: 2011-05-20