Oil & Gas Geology ›› 2008, Vol. 29 ›› Issue (2): 268-275.doi: 10.11743/ogg20080217

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Distribution patterns of the end of the Middle Devonian tectonic unconformity and their constrain on the development and distribution of favorable stratigraphic traps in the Tarim Basin

Liu Jingyan1, Lin Changsong1, Peng Li1, Chen Qingqing1, Zhang Xiangxiang2, Zhou Xiaojun1   

  1. 1. China University of Geosciences, Beijing 100083, China;
    2. PetroChina Exploration & Development Research Institute, Beijing 100083, China
  • Received:2008-01-03 Online:2008-04-24 Published:2012-01-16

Abstract:

As a result of the early Hercynian Movement,the latest Middle Devonian tectonic unconformity is one of the most important unconformities in Tarim basin.It is widely distributed in the basin,occurring in the forms of superimposed unconformity,high angle unconformity,parallel unconformity,and conformity from the uplifted area to the depression.The underlying strata in Tabei and Tazhong areas were eroded severely and were accompanied by deposition and onlapping of the Donghe sandstone along the unconformity in Late Devonian,forming several erosional unconformity triangle zones and onlapping unconformity triangle zones.The distribution and structural styles of the unconformity are the results of tectonic movement and controls the distribution of the favorable stratigraphic traps.The erosional unconformity triangle zones are the potential areas for the Silurian lithologic traps,while the onlapping unconformity triangle zones are regarded as the favorable areas for the Devo-nian Donghe sandstone lithologic traps.

Key words: tectonic unconformity, erosional unconformity, onlapping unconformity, lithologic-stratigraphic trap, the end of the Middle Devonian, Tarim Basin

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