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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

湖泊岸线带直坝和斜坝：形成机制与沉积特征

卫平生1,2,潘树新1,2,陈彬滔1,2,刘彩燕1,2,梁苏娟1,2   

  1. 1.中国石油勘探开发研究院西北分院，甘肃 兰州 730020; 2.中国石油天然气集团公司油藏描述重点实验室，甘肃 兰州 730020
  • 收稿日期:2014-01-02 修回日期:2014-08-13 出版日期:2014-11-10 发布日期:2014-11-10
  • 作者简介:卫平生(1965-),男,山西新绛人,教授级高级工程师，博士,主要从事石油地质理论和应用研究. E-mail：weips@petrochina.com.cn.
  • 基金资助:
    中国石油股份有限公司重大专项(编号：2014B-0302)|“青西老君庙构造带整体评价研究”项目(编号：2013E-3304)联合资助.

Lakeshore Oblique and Orthogonal Bars:Sedimentary Features and Formation Mechanism

WEI Ping-sheng1,2,PAN Shu-xin1,2,CHEN Bin-tao1,2,LIU Cai-yan1,2,LIANG Su-juan1,2   

  1. (1.Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China; 2.Key Laboratory of Reservoir Description,CNPC,Lanzhou 730020,China)
  • Received:2014-01-02 Revised:2014-08-13 Online:2014-11-10 Published:2014-11-10

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摘要： 湖浪、环流和沿岸流等湖流对滩坝砂的形成和分布起到了重要的控制作用。为研究湖流对滨浅湖滩坝砂的改造作用及坝体边缘砂体的分布规律和沉积特征，以青海湖现代沉积和松辽盆地南部青山口组滩坝砂为基础，对上述问题进行了讨论。研究发现，青海湖和松辽盆地青山口组滩坝砂的边缘发育大量直坝和斜坝沉积。直坝和斜坝分别垂直或斜交于湖岸线生长，砂体具有狭长分布的特点，二者的形成主要受向岸浪和反射离岸浪的控制。直坝和斜坝常发育交错层理、平行层理及透镜状层理等浅水构造。直坝和斜坝砂体在坝体边缘呈群带状展布，平面上容易形成岩性油气藏。直坝和斜坝的研究对于完善陆相盆地滩坝砂的沉积模式和拓展我国陆相盆地岩性油气藏的勘探领域都具有重要的价值。

关键词: 直坝, 斜坝, 湖流, 形成机制, 松辽盆地, 青海湖

Abstract: Lake currents,such as lake wave,alongshore current and circulation,control the formation and distribution of lakeshore bars.Based on seismic sedimentological case study of modern sedimentation in Lake Qinghai and lakeshore bars of Qingshankou Formation in Songliao Basin,the above issue is studied.A large number of oblique bars and orthogonal bars were developed on the edge of lakeshore bars in Lake Qinghai and Qingshankou Formation of Songliao Basin.Oblique bars and orthogonal bars respectively were developed vertically or obliquely to the shorelines,their sand body is spread as narrow belts,and their formation is controlled by the onshore wave and offshore wave.The bars are characterized by shallow water sedimentary structures,such as wave cross bedding,parallel and linsen bedding,and inverted and composite facies sequences.As the study shows,the bars perform fine petrophysics to easily develop into native lithologic and stratigraphic reservoirs.The study of oblique and orthogonal bars is valuable to improve the knowledge of sedimentary pattern of beach-bars of terrestrial basin and to expand exploration field of lithologic reservoirs.

Key words: Oblique bar, Orthogonal bar, Lake current, Formation mechanism, Songliao Basin, Lake Qinghai

中图分类号: 

  • TE121.3

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