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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

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

CLC Number: 

  • TE122.2

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