Articles

Seismic Identification and Formation Mechanism of Large-scale Sandstone Intrusions in Deep-water Basin

  • MA Yubo ,
  • SUN Qiliang ,
  • YUAN Shengqiang ,
  • WU Shiguo ,
  • DONG Dongdong ,
  • SUN Yunbao
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  • 1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Graduste University of Chinese Academy of Sciences, Beijing 100049,China

Received date: 2008-01-03

  Revised date: 2008-04-22

  Online published: 2008-06-10

Abstract

Large-scale sandstone intrusions are important components of many deep-water clastic systems. They were formed by the unconsolidated sandstones of early burial stages remobilizing and injecting into the overlying strata and were commonly found in fine-grained argillaceous sediments developed in polygonal fault network. They can affect the distribution of sandstone reservoir, the vertical migration and oil/gas accumulation for their high porosity and high permeability. By integrating the research results at home and abroad,the seismic character and formation mechanism of large-scale sandstone intrusions are discussed. Results shows that they often form complex and spectacular features on 3D seismic data, such as a distinctive suite of discordant, high-amplitude reflections, the opposite polarity of upper and lower reflections, conical amplitude, horizon pull-down and so on. The sandstone intrusions are resulted from extremely high pressure in deep water environment. The presence of a widespread region of conical sandstone instrusions in the deep-water basin has important implications for vertical fluid migration in the region. 

Cite this article

MA Yubo , SUN Qiliang , YUAN Shengqiang , WU Shiguo , DONG Dongdong , SUN Yunbao . Seismic Identification and Formation Mechanism of Large-scale Sandstone Intrusions in Deep-water Basin[J]. Advances in Earth Science, 2008 , 23(6) : 562 -569 . DOI: 10.11867/j.issn.1001-8166.2008.06.0562

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