Oil & Gas Geology ›› 2010, Vol. 31 ›› Issue (1): 91-97.doi: 10.11743/ogg20100115

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The Paleozoic tectonic evolution and the Carboniferous source rocks in the northern Juggar Basin

Yu Tengxiao1, Cao Zicheng1, Xu Qinqi1, Pan Quanyong1, Xue Hui2, Liu Shilin2, Xie Guojun2   

  1. 1. Research Institute of Petroleum Exploration and Development, SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China;
    2. Northwest Branch of SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China
  • Received:2009-09-27 Online:2010-02-25 Published:2012-01-16

Abstract:

The tectonic evolution history of the Northern Junggar Basin from the Sinian to the Carboniferous can be divided into two stages based on study of its fault evolution.The first is ocean basin spreading stage from the Sinian to the Middle Ordovician and the second is ocean basin subduction and plate suturing stage from the Late Ordovician to the Carboniferous.During the Carboniferous,the northern Junggar Basin was in bathyal-shallow marine and ocean-continent transitional environments,and therefore was suitable for the development of source rocks.Drilling data and field outcrops reveal that there are two sets of source rocks developed in the Lower and Upper Carboniferous respectively.Oil-source correlation and tectonic evolution analysis suggest that the oil/gas of the Lun-5 and DB-1 wells are mainly derived from the Carboniferous source rocks in the Wulungu depression.

Key words: tectonic evolution, source rock, Paleozoic, Wulungu Depression, northern Junggar Basin

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