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Volume 46 Issue 4
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(4): 868-879
CAI Zhenzhong, ZHANG Hui, XU Ke, YIN Guoqing, WANG Zhimin, WANG Haiying, QIAN Ziwei, ZHANG Yu. Geomechanics modeling of ultra-deep fault-controlled carbonate reservoirs and its application in development[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 868-879. doi: 10.11781/sysydz202404868
Citation: CAI Zhenzhong, ZHANG Hui, XU Ke, YIN Guoqing, WANG Zhimin, WANG Haiying, QIAN Ziwei, ZHANG Yu. Geomechanics modeling of ultra-deep fault-controlled carbonate reservoirs and its application in development[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(4): 868-879. doi: 10.11781/sysydz202404868
shu

Geomechanics modeling of ultra-deep fault-controlled carbonate reservoirs and its application in development

doi: 10.11781/sysydz202404868
  • 1.

    PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China

  • 2.

    Research and Development Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla, Xinjiang 841000, China

  • 3.

    Engineering Research Center for Ultra-Deep Complex Reservoir Exploration and Development, Xinjiang Uygur Autonomous Region, Korla, Xinjiang 841000, China

  • 4.

    Xinjiang Key Laboratory of Ultra-Deep Oil and Gas, Korla, Xinjiang 841000, China

  • 5.

    State Energy Key Laboratory of Carbonate Oil and Gas, Korla, Xinjiang 841000, China

  • 6.

    Key Laboratory of Carbonate, CNPC, Korla, Xinjiang 841000, China

  • Received Date: 2023-08-07
  • Rev Recd Date: 2024-05-30
  • Publish Date: 2024-07-28
    Abstract
  • To enhance the development efficiency of ultra-deep fault-controlled carbonate reservoirs, large-scale rock mechanical experiments were conducted to reveal the deformation and connectivity mechanisms of high-angle to near-vertical fault surfaces. Based on the mechanical and flow coupling principles of high-pressure water injection production, geomechanical modeling was employed to clarify the current in-situ stress field and fault activity distribution patterns in fault-controlled carbonate reservoirs. Significant differences were found in fault activities in different directions and in the connectivity of fracture and cavity bodies in different parts. The development effects of different wellbore trajectories were then analyzed, and an integrated geological and engineering working method was proposed to scientifically guide the design of wellbore trajectories and the optimization of water injection schemes. The results show: ① Large-scale fractured bodies and high-angle fracture systems in strike-slip fault deformation are key factors affecting reservoir quality. High-pressure water injection can activate existing fractures on one hand, and on the other hand, it can extend and expand based on existing fractures, even generating new fractures, promoting the interconnection of fault-controlled fracture and cavity bodies in both vertical and horizontal directions; ② During the high-pressure water injection process, coupling changes between mechanics and flow occur inside the fault body, improving the seepage environment, and increasing oil and gas recovery rate through cyclic lifting; ③ According to the shape and the occurrence of the fault body, and the dynamic shear deformation connectivity of the fault surface, the best well point and well trajectory for directional wells can be selected, and the water injection scheme can be optimized; ④ In the fault-controlled oil reservoir test area of Tarim Basin, the recovery rate was increased by 5% through high-pressure water injection. This method provides a good theoretical basis and technical support for the efficient development of ultra-deep fault-controlled reservoirs.

     

    • All authors disclose no relevant conflict of interests.
    The experiment was designed and the manuscript was reviewed by CAI Zhen-zhong and ZHANG Hui. The manuscript was drafted by CAI Zhenzhong, ZHANG Hui, and XU Ke. The experiment results were analyzed by YIN Guoqing and WANG Zhimin. The 3D modelling was made by WANG Haiying. QIAN Ziwei was responsible for drawing the diagrams and proofreading the paper. All authors have read the last version of the paper and consented to its submission.
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