Xinjiang Petroleum Geology ›› 2008, Vol. 29 ›› Issue (1): 41-44.

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Characteristics of Shallow Oil Reservoir in Youquanzi Field in Western Qaidam Basin

LIANG Chang-guo1, LIN Cheng-yan1, WANG Guo-min2, LIU Jian2, ZHANG Yong-mei2   

  1. 1. Faculty of Geo-Resource and Information, China University of Petroleum, Dongying, Shandong 257061, China;
    2. Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China
  • Received:2007-03-30 Published:2020-08-10

Abstract: The main oil-bearing series in Youquanzi shallow oil reservoir in western Qaidam basin is Shangyoushashan formation of Neocene (N2 2), being a lithologic-structural reservoir. Based on core analysis, imaging log, mercury injection, cast thin section, etc., this paper analyzes the main control factors to the structure, petrophysical property and reservoir quality in this studied area. It is pointed out that the lithology in this reservoir mainly includes sandy micrite limestone, (silty) algal limestone and limy (muddy) siltstone; reservoir spaces include intergranular pore and solution pore; the best lithology is (silty) algal limestone, and the second are silty micrite limestone and limy (muddy) siltstone. The main controlling factors for reservoir quality include sedimentary microfacies, fault/fracture action, atmospheric water solution along fault zones and organic acid solution.

Key words: Qaidam basin, Neocene, reservoir, feature

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