Oil & Gas Geology ›› 2008, Vol. 29 ›› Issue (2): 181-188.doi: 10.11743/ogg20080205

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Reassessment of the Carboniferous oil pooling in Tz-4 field,the Tarim Baisn

Yang Chupeng1,2, Zhang Baomin3, Wang Feiyu4, Lu Yuhong5, Xiao Qilin1,2, Zhang Haizu5, Liao Zewen1, Geng Ansong1   

  1. 1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;
    2. Graduate School of CAS, Beijing 100039, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    4. Faculty of Resources and Information, China University of Petroleum, Beijing 102349, China;
    5. Research Institute of Petroleum Exploration & Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
  • Received:2007-12-21 Online:2008-04-24 Published:2012-01-16

Abstract:

The oil pooling process in the Carboniferous Tz-4 field is quite typical in the Lower Paleozoic petro-leum system,Tarim basin.The molecule and carbon isotope geochemical behavior of oil in the field was analyzed systematically and the pooling process was reassessed based on regional sedimentology and tectonics as well as geochemical data of reservoir bitumen and fluid inclusions.The results indicate that two kinds of source kitchens(i.e.the Middle-Upper Ordovician and the Middle-Lower Cambrian) with different thermal evolution history in the central Tarim basin might have contributed to the formation of the Carboniferous Tz-4 oil pool.The C reservoir is thought to be formed by one hydrocarbon charging from a single oil source and suffered almost no geochemical alteration,whereas the C reservoir is characterized by diversified hydrocarbon sources,multiphase charging,and late modification.The results also suggest that the C reservoir has a close relationship with C reservoir,and is partly the product of C reservoir adjustment and modification.

Key words: pooling process, Carboniferous, Tz-4 oilfield, Tarim Basin

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