天然气地球科学

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琼东南盆地中中新世重力流海底扇沉积特征及控制因素

谢玉洪,范彩伟,周家雄,张迎朝,谭建财,任科英   

  1. (中海石油(中国)有限公司湛江分公司,广东 湛江 524057)
  • 收稿日期:2015-04-08 修回日期:2015-10-27 出版日期:2016-02-10 发布日期:2016-02-10
  • 作者简介:谢玉洪(1961),男,河北沧州人,教授级高级工程师,博士,主要从事油气勘探研究. Email:xieyh@cnooc.com.cn.
  • 基金资助:

    国家科技重大专项“莺琼盆地高温高压天然气成藏主控因素及勘探方向”课题(编号:2011ZX05023004)资助.

Sedimentary features and controlling factors of the gravity flows in submarine fan of Middle Miocene in the Qiongdongnan Basin

Xie Yuhong,Fan Caiwei,Zhou Jiaxiong,Zhang Yingzhao,Tan Jiancai,Ren Keying   

  1. (Zhanjiang Branch of CNOOC Ltd.,Zhanjiang 524057,China)
  • Received:2015-04-08 Revised:2015-10-27 Online:2016-02-10 Published:2016-02-10

摘要:

以往研究认为琼东南盆地陆架坡折形成于中新世末期,而在中新世早中期盆地北部为古斜坡地形。通过对琼东南盆地中新统坡折带、区域海平面、三角洲与重力流海底扇沉积的关系分析,结合钻井、地震等资料确定了琼东南盆地中中新世海底扇沉积特征及控制因素。结果表明,在中新世早中期盆地北部发育沉积、断裂和挠曲3种类型坡折,海底扇的沉积分布主要是受到沉积坡折控制,尤其是10.5Ma区域海平面下降时期,陵水凹陷、乐东凹陷发育早、晚2期大型富砂海底扇,早期海底扇沉积在陵水凹陷,浊积水道迁移快,数量多但下切作用不强;晚期海底扇沉积在乐东凹陷,浊积水道稳定分布,数量少,下切明显,朵叶体平面呈扇形分布,海底扇水道和朵叶体是有利的沉积单元。

关键词: 琼东南盆地, 中中新统, 坡折带, 海底扇, 控制因素, 沉积特征

Abstract:

Previous research showed that shelf slope break zone in Qiongdongnan Basin was formed at the end of Miocene,while paleoslope was developed in the northern Basin at the earlymiddle period of the Miocene.Based on the analysis of the relationship of Miocene slope break zone,regional sea level,delta,and gravity flows,sedimentary features and controlling factors of the gravity flows were concluded with drilling and seismic data.The research showed that sedimentary,fault and flexure slope breaks were developed in the northern Basin at the earlymiddle period of the Miocene,and sedimentary break zone had an important effect on the distribution of the gravity flows.When regional sea level falling at 10.5Ma,Ledong Sag and Lingshui Sag developed largescale and sandrich submarine fans,which could be divided into two periods.Lingshui Sag developed early submarine fans,where turbidite channels moved quickly with large number and weak incision.Ledong Sag developed terminal submarine fans,where turbidite channels distributed stably with smaller amount and strong incision,and lobes bodies' morphology appeared flabellate.Turbidite channels and lobes bodies of submarine fans were the favorable sedimentary units.

Key words: Qiongdongnan Basin, Middle Miocene, Slope break zone, Submarine fan, Control factors, Sedimentary features

中图分类号: 

  • TE122.2

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