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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2020  >  42(1): 60-68
CHENG Leli, YIN Senlin, WAN Youli, WANG Jian, FENG Xinglei, LI Xueren, ZENG Shengqiang. Diagenesis and pore evolution of tight sandstone reservoirs in Upper Triassic Bagong Formation, North Qiangtang Depression, Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(1): 60-68. doi: 10.11781/sysydz202001060
Citation: CHENG Leli, YIN Senlin, WAN Youli, WANG Jian, FENG Xinglei, LI Xueren, ZENG Shengqiang. Diagenesis and pore evolution of tight sandstone reservoirs in Upper Triassic Bagong Formation, North Qiangtang Depression, Qiangtang Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2020, 42(1): 60-68. doi: 10.11781/sysydz202001060
shu

Diagenesis and pore evolution of tight sandstone reservoirs in Upper Triassic Bagong Formation, North Qiangtang Depression, Qiangtang Basin

doi: 10.11781/sysydz202001060
  • 1.

    Institute of Mud Logging Technology and Engineering, Yangtze University, Jingzhou, Hubei 434023, China

  • 2.

    Chengdu Geological Survey Center, China Geological Survey, Chengdu, Sichuan 610081, China

  • 3.

    Key Laboratory for Sedimentary Basin and Petroleum Resources, Ministry of Natural Resources, Chengdu, Sichuan 610081, China

  • 4.

    School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

  • Received Date: 2019-08-29
  • Rev Recd Date: 2019-11-28
  • Publish Date: 2020-01-28
    Abstract
  • The diagenesis and pore evolution process of tight sandstone reservoirs in the Upper Triassic Bagong Formation of the North Qiangtang Depression were studied by means of physical properties, casting thin slice, SEM, X-ray-diffraction and fluid inclusion temperature measurement. The compositional maturity and structural maturity of the Bagong sandstones are moderately low. Their physical properties are extremely tight. The main diagenetic effects include compaction, cementation, dissolution and metasomatism. The cement components are mainly siliceous, clay minerals and carbonate minerals, and the dissolution component is feldspar. According to the comprehensive analysis of various characteristics, the shallow buried area near the uplift is in the middle diagenesis stage B, and the deep buried area inside the depression is in the late diagenetic stage. Under the premise of considering the apparent volume change and compaction of rock, a quantitative calculation of pore evolution of different diagenetic facies is carried out. The calculation results show that compaction is the primary cause of reservoir porosity reduction, followed by cementation, while dissolution and the formation of chlorite lining are beneficial to reservoir porosity.

     

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