天然气地球科学

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琼东南盆地水合物探区第四系深水沉积体系演化及与BSR关系

金丽娜,于兴河,董亦思,单新,何玉林,林霖   

  1. 1.中国地质大学(北京),北京100083;2.中国科学院地质与地球物理研究所,北京 100029;
    3.国家海洋局第一海洋研究所,山东  青岛 266061;4.广州市海洋地质调查局,广东 广州 510700
  • 收稿日期:2017-09-13 修回日期:2018-01-01 出版日期:2018-05-10 发布日期:2018-05-10
  • 通讯作者: 于兴河(1958-),男,湖北襄樊人,教授,博士生导师,主要从事沉积、储层研究. E-mail:billyu@cugb.edu.cn
  • 作者简介:金丽娜(1992-),女,黑龙江大庆人,硕士研究生,主要从事海洋沉积学研究.E-mail:jinlina92@qq.com.
  • 基金资助:

    广州海洋地质调查局“天然气水合物资源勘查与试采工程”国家专项(127)项目(编号:GZH201100305);山东省博士后创新项目专项(编号:201702045)联合资助.

The evolution of Quaternary depositional system in gas hydrate exploration area in Qiongdongnan Basin and its relationship with BSR

Jin Li-na,Yu Xing-he,Dong Yi-si,Shan Xin,He Yu-lin,Lin Lin   

  1. 1.China University of Geosciences (Beijing),Beijing 100083,China;
    2.Institute of Geology and Geophysics,Chinese academy of Sciences,Beijing 100029,China;
    3.First Institute of Oceanography,SOA,Qingdao 266061,China;
    4.Guangzhou Marine Geological Survey,Guangzhou 510700,China
  • Received:2017-09-13 Revised:2018-01-01 Online:2018-05-10 Published:2018-05-10

摘要:

为查明琼东南盆地深水区第四系沉积特征及其与似海底反射层(BSR)的关系,通过对研究区三维地震数据进行层序划分、剖面地震特征识别以及地震属性综合分析,查明琼东南盆地深水区第四系发育包括充填状、丘状、席状、透镜状、楔状及乱岗状在内共6个大类18种地震相。根据地震相分析,认为研究区主要发育半深海稳定沉积、水道—天然堤复合沉积和块体搬运3种沉积体系。根据层序界面识别可将琼东南盆地深水区第四系划分为3个层序。层序Ⅰ为半深海稳定沉积上伴生大面积水道及天然堤复合体沉积。层序Ⅱ为北部和南部发育小规模水道及天然体复合体,东部发育大面积块体搬运沉积。层序Ⅲ中部为小型水道及天然体复合体,东部至北部都发育块体搬运沉积。为明确水合物空间分布规律,在研究区内进行BSR识别与建模,研究发现该区BSR多位于三级层序界面T0-1附近或与其重合,通过叠合发现其与块体搬运相有良好的耦合关系,表明块体搬运相有望作为水合物赋存可能的有利区。

关键词: 琼东南盆地, 第四系, 地震相, 块体搬运, 水合物

Abstract:

The purpose of this study is to determine the relationship between gas hydrate position and sedimentary features of Quaternary deposits.Based on 3-D seismic data,6 groups and 18 types of seismic facies are identified through sequence division,identification of reflection pattern,integrated seismic property analysis.These seismic facies indicate the development of hemipelagic deposits,channel and levee sedimentation,and mass transport deposits.Sequence Ⅰ is featured by hemipelagic deposits and co-development of channel and levee.Sequence Ⅱ is characterized by small scale channel and levee in the north and south,and mass transport deposit in the east.Sequence Ⅲ has a characteristic of having small scale channel and levee complex,and mass transport deposit in the east and north.BSR identification and modeling were conducted in order to determine gas hydrate spatial distribution mechanism.  The result shows that BSR develops along 3-order  sequence  boundary   T0-1.This study indicates BSR has a close relationship with mass transport deposits,which also proposed mass transport deposits could be a favorable place for gas hydrate accumulation.

Key words: Qiongdongnan Basin, Quaternary, Seismic facies, Sedimentary evolution;, Gas hydrate

中图分类号: 

  • TE122.2

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