Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 323-345.doi: 10.13278/j.cnki.jjuese.20170302

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Genesis Classification, Development Mechanism and Sedimentary Model of Deep-Lacustrine Gravity Flow in Fushan Sag of Beibuwan Basin

Li Yuan1,2, Lin Song1, Lin Zhengliang3, Ma Qinglin4   

  1. 1. Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;
    2. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;
    3. Petroleum Geophysical Research Institute, SINOPEC, Nanjing 210014, China;
    4. Southern Petroleum Exploration and Development Co., Ltd., PetroChina, Guangzhou 510240, China
  • Received:2012-11-14 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China (41472084) and Social Public Welfare Research Project of China Seismological Bureau (IS201626261)

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Abstract: Fushan sag is a Cenozoic faulted lake basin on the slope of Hainan uplift in the southern margin of Beibuwan basin. This paper makes full use of the high-resolution three-dimensional seismic data covering the whole study area. Guided by various theories such as sequence stratigraphy and sedimentology, combined with relevant technologies such as sedimentary petrology and seismic sedimentology,a comprehensive study of the whole study area is carried out. In the period of SQEls2EST+LST of Liushagang Formation in Paleogene, four types of deep-lacustrine gravity flow sedimentary lithofacies were identified in Fushan sag. Through lithofacies assemblage and its transformation characteristics, sand dispersion system and seismic facies analysis, the distribution characteristics of sedimentary system were carefully analyzed, and then the sedimentary model of deep-lacustrine gravity flow in Fushan sag was established. The lake floor fan deposits with typical turbidite channel developed mainly in the western eastern regions. In this area, the distal solitary bodies formed by sandy clastic deposits are dominant. This study not only has direct significance for the study of sedimentary system in Fushan sag, but also provides theoretical support for many continental fault basins with the same background in Southern China.

Key words: deep-lacustrine gravity flow, sandy clastics, turbidite, sub-lacustrine fan, Fushan sag

CLC Number: 

  • P586
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