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Volume 45 Issue 4
Jul.  2023
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2023  >  45(4): 632-645
WANG Jian, GAO Chonglong, BAI Lei, XIANG Baoli, LIU Jin, XIAN Benzhong, LIAN Lixia, LIU Ke. Diagenesis and pore evolution of Cretaceous Qingshuihe Formation reservoir in western section of southern margin of Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 632-645. doi: 10.11781/sysydz202304632
Citation: WANG Jian, GAO Chonglong, BAI Lei, XIANG Baoli, LIU Jin, XIAN Benzhong, LIAN Lixia, LIU Ke. Diagenesis and pore evolution of Cretaceous Qingshuihe Formation reservoir in western section of southern margin of Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 632-645. doi: 10.11781/sysydz202304632
shu

Diagenesis and pore evolution of Cretaceous Qingshuihe Formation reservoir in western section of southern margin of Junggar Basin

doi: 10.11781/sysydz202304632
  • 1.

    Research Institute of Experiment and Detection, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

  • 2.

    CNPC Key Laboratory of Conglomerate Reservoir Exploration and Development, Karamay, Xinjiang 834000, China

  • 3.

    Xinjiang Laboratory of Petroleum Reserves in Conglomerate, Karamay, Xinjiang 834000, China

  • 4.

    College of Petroleum, China University of Petroleum-Beijing at Karamay, Karamay, Xinjiang 834000, China

  • 5.

    College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China

  • 6.

    College of Geosciences, Northeast Petroleum University, Daqing, Heilongjiang 163318, China

  • Received Date: 2022-12-08
  • Rev Recd Date: 2023-06-16
  • Publish Date: 2023-07-28
    Abstract
  • The Qingshuihe Formation in the western section of the southern margin of the Junggar Basin has excellent oil and gas exploration prospects. The systematic study of its diagenesis characteristics and pore evolution process will provide guidance for the later fine exploration and evaluation of oil and gas. Therefore, based on the analysis of ordinary thin sections, cast thin sections, whole rock X-ray diffraction, grain size, scanning electron microscopy, carbon and oxygen isotopes of carbonate cements and fluid inclusions, the diagenesis characteristics and pore evolution process of the Qingshuihe Formation in the western section of the southern margin of the Junggar Basin were systematically studied, and the differences of reservoir pore evolution process between different diagenetic facies were further discussed. The study shows that: (1)The reservoir of the Qingshuihe Formation in the studied area is dominated by glutenite. The content of rock debris is high, with an average of 65.97%, mainly tuff rock debris. The cement is mainly calcite. The average porosity of the reservoir is 6.2%, and the average permeability is 7.45×10-3 μm2. It is generally a tight reservoir of low porosity and low permeability, but high-quality reservoirs are still developed locally; (2)The reservoir burial mode of the Qingshuihe Formation in the southern margin of the Junggar Basin is characterized by long-term shallow burial and late rapid deep burial, and can be further divided into four evolutionary stages: long-term shallow burial, tectonic uplift to near surface, normal deep burial, and rapid deep burial. The diagenetic evolution of the reservoir was in early diagenetic stage A in the long-term shallow burial, tectonic uplift to near surface, and normal deep burial stages, while in the rapid deep burial stage, the reservoir was in early diagenetic stage B to middle diagenetic stage A; (3)The reservoir of the Qingshuihe Formation can be divided into four typical diagenetic facies types, namely, strong compaction facies, calcareous/iron argillaceous strong cementation facies, tuffaceous filling weak dissolution facies, and weak compaction pore development facies. The pore evolution model of the clastic rock reservoir of the Qingshuihe Formation in the southern margin of the Junggar Basin was established based on the constraints of diagenetic facies. The weak compaction pore development facies are high-quality reservoir diagenetic facies, followed by tuffaceous filling weak dissolution facies.

     

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