西南石油大学学报(自然科学版)

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Identification of the Lithology of Carboniferous and Its Reservoir Characteristics in Chepaizi Uplift,Junggar Basin

Wang Kun1, Zhang Feng2, Zhang Yi2, Wang Dongkun3   

  1. 1. Research Institute of Petroleum Exploration and Development,PetroChina,Haidian,Beijing 100083,China
    2. Western Prospect Research Center,Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257000,China
    3. School of Geoscience,China University of Petroleum(Huadong),Qingdao,Shandong 266580,China
  • Online:2014-08-01 Published:2014-08-01

Abstract:

The develop sedimentary rocks and igneous rocks with complicated lithology in the Carboniferous in Chepaizi uplift,and the degree of exploration for Carboniferous is very low as well as the reservoir characters are undefined. By using logging identification plates,imaging logging and Fisher discriminant analysis,we identified the lithology. The identification plates can well distinguish lava and sedimentary rock. Imaging logging can distinguish the characteristics of different lithology. Fisher discriminant analysis can integrate various logging information and achieve auto identification. A comparison of the log interpretation section with the final well logging section suggests the feasibility of the identification method. This method can decrease the cost and time consumption for lithology identification. The reservoir space,physical characteristics,distribution characteristics and facies of Carboniferous igneous reservoir were analyzed by thin sections and magnetic data. The main Carboniferous reservoir space are cracks and holes and the volcanic breccia has best reservoir qualities. Volcanic breccia and lava are better developed in the eastern region than in the west,suggesting a better reservoir quality. Volcanic sedimentary facies,effusive facies and outbreak facies mainly develop in Carboniferous,among which outbreak facies reservoir has the best property,followed by effusive facies and the volcanic sedimentary facies is of the worst.

Key words: Junggar Basin, Chepaizi uplift, Carboniferous, igneous, lithology identification, reservoir property