Volume 42 Issue 1
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LI Bing, NING Xianyi, ZHU Weiping, et al.Stress sensitivity experiment on shale gas formations in marine-continental transitional facies in easten margin of Ordos basin[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：30-40 doi: 10.12358/j.issn.1001-5620.2025.01.003
Citation: LI Bing, NING Xianyi, ZHU Weiping, et al.Stress sensitivity experiment on shale gas formations in marine-continental transitional facies in easten margin of Ordos basin[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：30-40 doi: 10.12358/j.issn.1001-5620.2025.01.003
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Stress Sensitivity Experiment on Shale Gas Formations in Marine-Continental Transitional Facies in Easten Margin of Ordos Basin

doi: 10.12358/j.issn.1001-5620.2025.01.003
  • 1.

    Institute of Engineering Technology, Petro China Coalbed Methane Company Limited, Xi'an, Shaanxi 710082

  • 2.

    China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095

  • 3.

    National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu，Sichuan 610500

  • Received Date: 2024-09-18
  • Rev Recd Date: 2024-10-24
  • Publish Date: 2025-02-01
    Abstract
  • The shale gas formations in the marine-continental transitional facies of the eastern margin of the Ordos Basin are tight gas formations with complex pore and fracture structures as well as high heterogeneity which result in special stress sensitivity of the formations. To understand the degree of the stress sensitivity of the reservoirs, stress sensitivity experiments were performed on cores taken from the marine-continental transitional facies of the eastern margin of the Ordos Basin. The experimental results, combined with the understanding of the lithology and the physical properties of the reservoirs, help reveal the mechanisms of stress sensitivity of the shale gas reservoirs concerned. The studies performed indicate that when the effective stress is increased from 3 MPa to 35 MPa, the permeability of the artificial fractures, the natural fractures and the base core decreases by 97.1%, 86.8% and 50,5%, respectively. During unloading of the effective stress, the permeability of the artificial fractures, the natural fractures and the base core is recovered by 21.4%, 19.0% and 11.6%, respectively, showing significant stress sensitivity hysteresis effects. The stress sensitivity coefficients of the artificial fractures, the natural fractures and the base core are 0.65, 0.58 and 0.19, respectively, and the degrees of stress sensitivity corresponding to these stress sensitivity coefficients are classified as strong-moderate to strong, strong-moderate to weak and weak. The stress sensitivity coefficients show that the multi-scale pore-fracture structure of the shales under research have significant stress sensitivity. The main control factors of formation damage by stress sensitivity include the mineral components, the development of the fractures as well as the pore structure of the shales in the marine-continental transitional facies. It is thus suggested that a reservoir-protective gas production system be developed, and the production of gas be controlled to ensure high production rate and stable production of the gas wells drilled in the marine-continental transitional facies of the eastern margin of the Ordos Basin.

     

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