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Study on the Tight Gas Accumulation Process and Model in the Transition Zone at the Margin of the Basin: A Case Study on the Permian Lower Shihezi Formation, Duguijiahan Block, Ordos Basin, Northern China

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  • Hanwen Yu

    (Key Laboratory of Tectonics and Petroleum Resources, China University of Geoscience, Ministry of Education, Wuhan 430074, China)

  • Jiaren Ye

    (Key Laboratory of Tectonics and Petroleum Resources, China University of Geoscience, Ministry of Education, Wuhan 430074, China)

  • Qiang Cao

    (Key Laboratory of Tectonics and Petroleum Resources, China University of Geoscience, Ministry of Education, Wuhan 430074, China)

  • Yiming Liu

    (Key Laboratory of Tectonics and Petroleum Resources, China University of Geoscience, Ministry of Education, Wuhan 430074, China)

  • Wei Zhang

    (Exploration and Development Research Institute, SINOPEC North China Company, Zhengzhou 450006, China)

Abstract

Recent discoveries of oil and gas have principally been located in the central part of the Ordos Basin, which is a petroliferous basin with the largest discovered reserves and annual production of tight sandstone gas in China. For tight sandstone gas reservoirs in the transition zone of the basin margin, the process of natural gas accumulation has remained relatively vaguely understood, because of the transitional accumulation of geological conditions such as structure, sedimentation, and preservation. In this study, thin-section identification and scanning electron microscopic observations of the reservoir core, measurement of the physical properties of the reservoir, microscopic petrography research and measurement of the homogenization temperature of fluid inclusions, digital simulations, and laser Raman spectroscopy analysis were combined to analyze the process of natural gas accumulation of the Permian Lower Shihezi Formation in Duguijiahan block, Hangjinqi area, northern Ordos Basin. The results showed that the Lower Shihezi Formation reservoir in the Duguijiahan block began gas charging in the southern part as early as the Early Cretaceous (130–128 Ma), and then gradually charged in the northern part. Three stages were identified in the digital simulations of gas charging, i.e., the breakthrough, rapid, and fully saturated stages. The initial porosity of the Lower Shihezi Formation reservoir ranged between 28% and 40%. Later, because of strong compaction and interstitial filling during burial, the sandstone porosity decreased rapidly, and densification (porosity < 10%) occurred in the mid–late Jurassic. This late tectonic uplift caused a continuous reduction in ground temperature, and diagenesis had a weak effect on pore transformation. The present porosity of the Lower Shihezi Formation reservoir basically inherited its characteristics in the late Early Cretaceous. The current average porosity of the reservoir is 8.58%, and the average permeability is 0.88 mD, and it can thus be characterized as a tight reservoir. The gas accumulation process of the Lower Shihezi Formation has three stages: (1) the depositional stage (C–P), corresponding to the depositional stage of the source-reservoir-cap combination in gas reservoir; (2) the natural gas accumulation stage (T–K 1 ), corresponding to the period of rapid source rock maturation and natural gas charging step-by-step; and (3) the gas reservoir adjustment stage (K 2 –present), corresponding to the period of uplift and natural gas charging in the early stage that gradually migrated and accumulated northward along the fracture zone. Finally, the gas accumulation model in the transition zone at the margin of basin was established.

Suggested Citation

  • Hanwen Yu & Jiaren Ye & Qiang Cao & Yiming Liu & Wei Zhang, 2023. "Study on the Tight Gas Accumulation Process and Model in the Transition Zone at the Margin of the Basin: A Case Study on the Permian Lower Shihezi Formation, Duguijiahan Block, Ordos Basin, Northern C," Energies, MDPI, vol. 16(3), pages 1-30, February.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1493-:d:1055911
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    References listed on IDEAS

    as
    1. Tong Liu & Xu Jin & Moran Wang, 2018. "Critical Resolution and Sample Size of Digital Rock Analysis for Unconventional Reservoirs," Energies, MDPI, vol. 11(7), pages 1-15, July.
    2. Yue Zhang & Jingchun Tian & Xiang Zhang & Jian Li & Qingshao Liang & Xiaoyu Zheng, 2022. "Diagenesis Evolution and Pore Types in Tight Sandstone of Shanxi Formation Reservoir in Hangjinqi Area, Ordos Basin, Northern China," Energies, MDPI, vol. 15(2), pages 1-16, January.
    3. Ren Wang & Kai Liu & Wanzhong Shi & Shuo Qin & Wei Zhang & Rong Qi & Litao Xu, 2022. "Reservoir Densification, Pressure Evolution, and Natural Gas Accumulation in the Upper Paleozoic Tight Sandstones in the North Ordos Basin, China," Energies, MDPI, vol. 15(6), pages 1-21, March.
    4. Yun He & Hengwei Guo & Haoxiang Lan & Can Ling & Meiyan Fu, 2022. "The Effect of Single Sandstone Stacking Pattern on the Sandstone Reservoir Physical Properties—A Case Study from the Shanxi Formation in the Daniudi Area, Northeastern Ordos Basin," Energies, MDPI, vol. 15(13), pages 1-13, June.
    5. Guangjie Zhao & Xianqing Li & Mancang Liu & Caiyuan Dong & Daye Chen & Jizhen Zhang, 2022. "Reservoir Characteristics of Tight Sandstone and Sweet Spot Prediction of Dibei Gas Field in Eastern Kuqa Depression, Northwest China," Energies, MDPI, vol. 15(9), pages 1-17, April.
    6. Yunwen Guan & Qijun Guo & Renhai Pu & Xiaoping Gao & Shuo Chen & Tianyu Ji, 2022. "Distribution of Upper Paleozoic Coal Seams in the Southeastern Ordos Basin," Energies, MDPI, vol. 15(14), pages 1-15, July.
    7. Lewei Hao & Xiaofeng Ma & Wenqiang Gao & Zhaocai Ren & Huifei Tao & Weikai Huang, 2022. "Geochemical Characteristics of the Chang 7 Source Rocks of the Triassic Yanchang Formation in Ordos Basin, China: Implications for Organic Matter Accumulation and Shale Oil Potential," Energies, MDPI, vol. 15(20), pages 1-20, October.
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