Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (1): 23-35.doi: 10.13278/j.cnki.jjuese.201601103

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Diagenesis and Pore Evolution of Triassic Baikouquan Formation in Mabei Region,Junggar Basin

Chen Bo1,2, Wang Zitian3, Kang Li4, Zhang Shuncun1, Shi Ji'an1   

  1. 1. Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, Xinjiang, China;
    4. Fengcheng Field Operation District, Xinjiang Oilfield Company, PetroChina, Karamay 834000, Xinjiang, China
  • Received:2015-04-19 Online:2016-01-26 Published:2016-01-26
  • Supported by:

    Supported by the State Key Development Program for Basic Research of China (2011CB201104), National Science and Technology Major Project (2011ZX05000-01-06) and Gansu Province Key Laboratory of Special Project(1309RTSA041)

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Abstract:

Base on core observation and casting thin section, combining with the analysis on scanning-electron microscope, as well as the comprehensive logging and mud logging data, the characteristics of reservoir sandstone, physical property, diagenesis, and pore evolution of the Triassic Baikouquan Formation in Mabei region,Junggar basin were studied. The results show that the study area of sand-conglomerate reservoir is low in composition, structure maturity, porosity, and permeability; and the pore types are mainly intergranular dissolution pores. The reservoir buried deeply in the study area, and the Triassic Baikouquan Formation in Mabei region is mainly formed in the late diagenetic stage B period, experienced complex diagenesis, including mainly compaction,cementation,dissolution. The compaction is the main factor that caused the original porosity reduction,By 19.5%,and cementation decreased the porosity for about 7.2%; while dissolution is constructive to the reservoir property as it can generate a great quantity of secondary porosity. Dissolutionin increased the porosity for about 5.2%. The secondary porosity zone formed by dissolution has become a high-quality reservoir zone with the background of low porosity and permeability in the study area.

Key words: Junggar basin, Mabei region, Triassic, Baikouquan Formation, diagenesis, pore evolution

CLC Number: 

  • P618.13

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