Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (3): 297-304.doi: 10.11743/ogg20050306

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Early Paleozoic palaeogeomorphology—characteristics of slope break zones and their control on stratigraphic-lithologic traps in Tarim Basin

Liu Hao1,2, Wang Yingmin2,3   

  1. 1. China University of Geosciences, Beijing;
    2. Key Laboratory for Hydrocarbon Accumulation of Ministry of Education, Beijing;
    3. China University of Petroleum, Beijing
  • Received:2005-04-14 Online:2005-06-25 Published:2012-01-16

Abstract:

Early Paleozoic slope breaks are well developed in Tarim basin.Typical shelf break was developed in Middie Cambrian-Middle-Late Ordovician.The Silurian slope break was a kind of palaeogeomorphology with landform difference,which was different from the shelf break.In Late Cambiran-Early Ordovician,the Manjiaer slope break acted as the boundary of platform edge facies and deep-sea basin facies.In Middle-Late Ordovician,the Manjiaer-Tadong slope break was the boundary of basin facies and diamictic shelf facies;while typical isolated platform facies and basin facies were developed above and below the Tazhong slope break,respectively.In Silurian,the southem Tazhong slope break evidently controlled the tidal flat and coastal deposits,while the northern Tazhong slope break was a good demarcation line between offshore and foreshore-shoreface in coastal system.Along the slope belt-lower footslope would be the favorable area for discovering lithologic traps,e.g.structural and lithologic traps are well developed in the Middle-Upper Ordovician above and below the Tazhong slope break and in the Tazhong segment of Manjiaer-Tadong slope break,and in the Silurian upper Kalpintag Fm Tazhong gentle slope-tidal flat belt;stratigraphic overlap and lithologic traps are well developed in the lower Kalpintag Fm in Awat-Southem Manjiaer slope break-coastal belt;and stratigraphic overlap and unconformity traps are well developed in lower Kalpintag Formation in Awat-Northern Manjiaer slope break-coastal belt.

Key words: stratigraphic-hthologic trap, slope break, palaeogeomorhology, Early Paleozoic, Tarim Basin

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