石油与天然气地质 ›› 2018, Vol. 39 ›› Issue (3): 438-453.doi: 10.11743/ogg20180303

• 油气勘探 • 上一篇    下一篇

异重流发育条件、演化过程及沉积特征

栾国强1, 董春梅1,2, 林承焰1,2, 任丽华1,2, 焦红岩3, 赵海燕3, 彭先国3   

  1. 1. 中国石油大学(华东)地球科学与技术学院, 山东 青岛 266580;
    2. 山东省油藏重点实验室, 山东 青岛 266580;
    3. 中国石化 胜利油田有限公司 现河采油厂, 山东 东营 257068
  • 收稿日期:2017-05-23 修回日期:2018-05-10 出版日期:2018-06-28 发布日期:2018-06-21
  • 作者简介:栾国强(1989-),男,博士,储层地质学。E-mail:luanupc@163.com。
  • 基金资助:
    国家科技重大专项(2017ZX05009-001)。

Development conditions, evolution process and depositional features of hyperpycnal flow

Luan Guoqiang1, Dong Chunmei1,2, Lin Chengyan1,2, Ren Lihua1,2, Jiao Hongyan3, Zhao Haiyan3, Peng Xianguo3   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    2. Shandong Provincial Key Laboratory of Reservoir Geology, Qingdao, Shandong 266580, China;
    3. Xianhe Oil Production Plant of Shengli Oilfield Company Ltd., SINOPEC, Dongying, Shandong 257068, China
  • Received:2017-05-23 Revised:2018-05-10 Online:2018-06-28 Published:2018-06-21

摘要: 异重流是指河流携带沉积物直接潜入蓄水体底部并沿盆地底部继续前进的高密度流体。通过大量文献调研,归纳总结了异重流的发育条件、沉积过程及相应沉积特征。异重流的形成受构造和气候条件控制,与所处的源汇系统密切相关。母岩固结程度低、半干旱气候、地形高差大、河流流域蒸发量低、一定的河口坡降和低密度的蓄水体等条件有利于异重流发生。异重岩沉积序列与异重流能量演化过程密切相关,反序(Ha)和正序(Hb)二元结构、内部突变/侵蚀界面、典型流动沉积构造和富含陆源植物碎屑等是识别异重岩的重要标志。在总结前人研究成果的基础上建立了由沟道充填沉积-沟道侧缘沉积-天然堤-前缘朵叶体4部分组成的异重流沉积模式。

关键词: 发育条件, 演化过程, 沉积特征, 沉积模式, 异重流

Abstract: Hyperpycnal flows are dense,formed when a sediment-laden fluid plunges into the bottom of a water body and flows basinward.After a large number of literature review,we summarized the development conditions,evolution process and depositional features of hyperpycnal flow.The formation of hyperpycnal flow is controlled by tectonic and climatic conditions,closely related to the location of the source-to-sink system.And the favorable conditions for its development are loose parent rocks,semi-arid climate,high elevation difference,low degree of evaporation of river drainage area,a significant slope at the river mouth and low-density water body.Typically,sedimentary sequence of hyperpycnites can reflect the evolution of hyperpycnal flow energy.To identify hyperpycnites,we should pay attention to important features such as coupling of inverse and normal grading (Ha-Hb),internal mutation/erosion contact,typical flowing depositional structures and concentration of plant debris.Based on previous workers'studies,we established an ideal model of hyperpycnal facies consisting of channel-filling sedimentation,channel margin sedimentation,natural levees and front lobes.

Key words: development condition, evolution process, depositional feature, depositional model, hyperpycnal flow

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