Advances in Earth Science ›› 2008, Vol. 23 ›› Issue (6): 562-569. doi: 10.11867/j.issn.1001-8166.2008.06.0562

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

Wu Shiguo 1,Sun Yunbao 1,2,Sun Qiliang 1,2,Dong Dongdong 1,2,Yuan Shengqiang 1,2,Ma Yubo 1,2   

  1. 1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Graduste University of Chinese Academy of Sciences, Beijing 100049,China
  • Received:2008-01-03 Revised:2008-04-22 Online:2008-06-10 Published:2008-06-10

Wu Shiguo,Sun Yunbao,Sun Qiliang,Dong Dongdong,Yuan Shengqiang,Ma Yubo. Seismic Identification and Formation Mechanism of Large-scale Sandstone Intrusions in Deep-water Basin[J]. Advances in Earth Science, 2008, 23(6): 562-569.

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. 

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