Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (6): 1689-1699.doi: 10.13278/j.cnki.jjuese.20200134

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Diagenesis of Lower Cretaceous Clastic Reservoir and Its Influence on Physical Properties in Bongor Basin, Southern Chad

Tao Yongfu1, Li Da1, Huang Changbing2, Liao Honghui1, Zhang Huaqin1, Xun Sheng1, Li Chong1, Wu Wei3   

  1. 1. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735000, Gansu, China;
    2. School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China;
    3. Geological Research Institute of CNPC Logging Co., Ltd., Xi'an 710000, China
  • Received:2020-06-03 Online:2021-11-26 Published:2021-11-24
  • Supported by:
    Supported by the Science and Technology Project of CNPC (2018D-0704)

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Abstract: Based on the data of cast thin section, X-ray diffraction, cathodoluminescence, scanning electron microscope, physical property analysis, vitrinite reflectivity and wrapping temperature, combined with core observation method, the basic characteristics and diagenesis of Lower Cretaceous clastic reservoir in Bongor basin are studied. According to the volume fraction and morphology of cement, the distribution of clay mineral components, microscopic characteristics of rock structure, pore evolution and thermal evolution of organic matter, the rock diagenetic stages are divided, and the influence of diagenesis on physical properties is analyzed. The results show that:The reservoir rock type in this area is mainly feldspathic sandstone, and the cement is mainly carbonate and clay minerals; Dissolved pore intergranular pore combination has the best reservoir performance, followed by intergranular pore dissolved pore combination; Diagenesis mainly includes compaction, cementation, metasomatism and dissolution; The diagenetic stage of the target layer is mainly middle diagenetic stage A, and the diagenesis is weak to medium; Diagenesis is the main factor controlling reservoir physical properties. Compaction and cementation are destructive diagenesis, which make the original porosity lose 54.93% and 31.30% respectively; In the rock particles, feldspar, carbonate cement and other soluble substances are developed, with strong dissolution, which is the main constructive diagenesis.

Key words: reservoir characteristics, diagenesis, clastic rock, Bongor basin, Lower Cretaceous, southern Chad

CLC Number: 

  • TE112.23
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