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Volume 46 Issue 3
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(3): 553-564
WANG Junjie, LU Shuangfang, LIN Zizhi, ZHOU Nengwu, ZHANG Pengfei, HUANG Hongsheng, ZHI Qi, LI Baizhi. Reservoir limits and grading evaluation criteria of tight glutenite: a case study of Cretaceous Shahezi Formation in Xujiaweizi Fault Depression, Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 553-564. doi: 10.11781/sysydz202403553
Citation: WANG Junjie, LU Shuangfang, LIN Zizhi, ZHOU Nengwu, ZHANG Pengfei, HUANG Hongsheng, ZHI Qi, LI Baizhi. Reservoir limits and grading evaluation criteria of tight glutenite: a case study of Cretaceous Shahezi Formation in Xujiaweizi Fault Depression, Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(3): 553-564. doi: 10.11781/sysydz202403553
shu

Reservoir limits and grading evaluation criteria of tight glutenite: a case study of Cretaceous Shahezi Formation in Xujiaweizi Fault Depression, Songliao Basin

doi: 10.11781/sysydz202403553
  • 1.

    Sanya Offshore Oil & Gas Research Institute, Northeast Petroleum University, Sanya, Hainan 572025, China

  • 2.

    Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing, Heilongjiang 163318, China

  • 3.

    School of Geoscience, China University of Petroleum (East China), Qingdao, Shandong 266580, China

  • 4.

    College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China

  • Received Date: 2023-06-05
  • Rev Recd Date: 2024-03-29
  • Publish Date: 2024-05-28
    Abstract
  • The Lower Cretaceous Shahezi Formation glutenite reservoirs in the Xujiaweizi Fault Depression are important tight gas reservoirs in the deep strata of the Songliao Basin. Their complex porosity and permeability relationships pose challenges to determining reservoir boundaries and evaluating reservoir grades. For the Shahezi Formation glutenite reservoirs, the water film thickness method, charge dynamics method, gas testing productivity method, and buoyancy balance method were used to determine theoretical lower limits, gas accumulation lower limits, effective flow lower limits, and reservoir-forming upper limits. The petrophysical values of the reservoir boundaries were determined based on the porosity and permeability relationships under different diagenetic controlling factors. On this basis, reservoir types were classified according to differences in microscopic pore structures, and a grading evaluation standard for tight reservoirs was established. This standard was then applied using logging data to provide a basis for selecting sweet spots in the tight gas exploration areas. The Shahezi Formation glutenite was divided into conventional reservoirs, Class Ⅰ-Ⅳ tight glutenite reservoirs, and non-reservoirs. The reservoir boundaries and classification evaluation results were well matched. Conventional reservoirs had porosity greater than 9% and permeability greater than 0.05×10-3 μm2. Class Ⅰ tight reservoirs had porosity of 8%-9% and permeability of (0.01-0.05)×10-3 μm2. Class Ⅱ tight reservoirs had porosity of 5%-8% and permeability of (0.001-0.01)×10-3 μm2. Class Ⅲ tight reservoirs had porosity of 3.5%-5% and permeability of (0.2-1)×10-3 μm2. Class Ⅳ tight reservoirs had porosity of 2%-3.5% and permeability of (0.05-0.2)×10-6 μm2. Non-reservoirs had porosity less than 2% and permeability less than 0.05×10-6 μm2. The gas production of tight glutenite was controlled by the reservoir type. Class Ⅰ and Class Ⅱ tight reservoirs were favorable high-yield layers. The thickness of favorable reservoirs in the Anda-Songzhan area of the northern Xujiaweizi Fault Depression was large, making it a sweet spot for tight gas exploration and development.

     

    • All authors disclose no relevant conflict of interests.
    WANG Junjie and LU Shuangfang participated in experimental design and manuscript writing. The experimental operation was completed by WANG Junjie, LIN Zizhi, ZHOU Nengwu and ZHANG Pengfei. HUANG Hongsheng, ZHI Qi and LI Baizhi participated in data organization and diagram drawing. All authors have read the last version of the paper and consented to its submission.
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