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Deposition system and formation mechanism of deepwater channel in Baiyun deepwater area,Pearl River Mouth Basin

Wang Qi,Tian Bing,Ma Xiao-feng,Mou Wei-wei,Gao Li-hua   

  1. 1.Key Laboratory of Petroleum Resources Research,Gansu Province/ Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China
  • Received:2017-04-19 Revised:2017-08-13 Online:2017-10-10 Published:2017-10-10

Abstract:

Deepwater channel deposits are one of the main depositional types in petroleum exploration and development.Based on high-resolution 3D seismic data,logging data and drilling data,a deepwater channel system was discovered in the Zhujiang Formation,Baiyun deepwater area,and the distribution character and genetic model of the system were identified by integrated with geological analysis and geophysical data interpretation.This system is NS-trending in a low sinuosity meandering form,and three types of deepwater gravity-flow deposits were identified,i.e.mass-transport,channel-levee complex and lobate deposits.The mass-transport deposit is developed in the northeast of Baiyun Sag,and has dome shaped appearance,internal chaotic seismic reflection with basal erosion scratches.The channel-levee complex deposit is the main pathway of the deepwater fan system,and can be classified as erosion,erosion/accretion and aggradations according to the origin.The channel deposit has the development feature of generation and segment controlled by source and geomorphology characteristics,and is a typical turbidite channel complexes configuration within complex superposition and migration relations.The lobate deposit which is located in the front of the channel is developed in the south of the Liwan Sag,and comes in a lobe-like shape on plane within a high-amplitude parallel to sub-parallel seismic reflection.And then the genetic model of the deepwater channel system was discussed by integrated with the ancient water depth,palaeotopography,triggering mechanism and the ancient source.The ancient Pearl River delta was speculated as its main source,and the carbonate deposition of Dongsha Massif as a secondary source.The research is of the theoretic significance in studying various depositional processes of deepwater gravity flow.

Key words: Deepwater channel, Deposition system, Depositional model, Baiyun deepwater area, Pearl River Mouth Basin

CLC Number: 

  • TE122.1

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