Oil & Gas Geology ›› 2007, Vol. 28 ›› Issue (3): 433-440.doi: 10.11743/ogg20070320

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Geochemical behaviors of crude oil in the southern margin of Junggar basin

Wei Dongtao1,2, Jia Dong1, Zhao Yingcheng2, Yang Haibo3, Chen Tao2, Wu Liangyu2, Shao Hongshun4   

  1. 1. Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093;
    2. Northwest Research Institute ofPetroleum Exploration & Development, PetroChina, Lanzhou, Gansu 730020;
    3. Institute of Petroleum Exploration & Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000;
    4. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou, Gansu 730000
  • Received:2006-07-07 Online:2007-06-25 Published:2012-01-16

Abstract:

A comprehensive geochemical analysis of the crude oil samples frorn the southem margin of Junggar basin helps to classify them into six basic types of three categories.They are oil from the Jurassic coal measure(type (一七)),and from lacustrine source rocks of the Permian(type (一四)),Cretaceous(type (一五)),and Eogene(type (九)),and mixed oils from the Jurassic and the Eogene(type V),and from the Jurassic and the Eogene(type V).It is showed that different tectonic units from the east to the west have different types of oils.The type iv,type (一七),and type V,are found in Fukang fault zones.The Qigu faulted-fold belts have similar oil types to those of the Fukang fault zones but with the additional type (一五).While the Huoerguosi-Manasi-Tugulu anticline and Sikeshu sag are relatively simple with the former contains mainly type (一四) and later harbors type (九) and type iv.According to the above oil-source analyses,it is suggested that the (一四)-type oil from the Cretaceous should be the source of oil in the study area.

Key words: oil-source analysis, geochemistry, Cretaceous, southern margin of Junggar basin

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