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<p>The Bashkichik Formation in the Kuqa Depression contains deep tight sandstone gas reservoirs. These reservoirs are buried over 5000&#xa0;m deep and their porosity ranges from 4 to 8%. The in-situ stress significantly influences the quality of these tight sandstone reservoirs in the Bashkichik Formation, yet the underlying mechanism remains elusive. Focusing on the deep Bashkichik Formation in the central Kuqa Depression, this study undertakes a systematic and comprehensive evaluation of the in-situ stress in tight sandstone reservoirs. Leveraging extensive data from conventional logging, array acoustic logging, FMI imaging logging, hydraulic fracturing, and production, the research explores the impact of in-situ stress on the petrophysical properties and productivity of tight sandstone reservoirs. The findings reveal that the in-situ stress state in the Bashkichik Formation is characterized by <i>σ</i><sub>v</sub> &gt; <i>σ</i><sub>H</sub> &gt; <i>σ</i><sub>h</sub>, with both the maximum and minimum horizontal principal stresses exhibiting a strong positive correlation with fracture pressure. Evaluations using the wall rock collapse method and the drilling-induced fracture method indicate that the in-situ stress direction of the target layer is nearly NNW. Employing an improved Newberry model, the study achieves accurate predictions of the in-situ stress in the target layer, with an average error of merely 5%. Longitudinal bending-induced flexural folding deformation affects formation thickness, fracture development, and in-situ stress state, consequently influencing the petrophysical properties of tight sandstone reservoirs. This research underscores the intimate relationship between in-situ stress, petrophysical properties, and productivity in deep tight sandstone reservoirs. The productivity of the tight sandstone reservoirs in the Bashkichik Formation is directly governed by petrophysical properties and indirectly influenced by in-situ stress, with fractures serving as a crucial indicator of petrophysical conditions.</p>

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Coupling relationship between in-situ stress, petrophysical property, and productivity in deep tight sandstone gas reservoirs

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Yi Zhao

摘要

The Bashkichik Formation in the Kuqa Depression contains deep tight sandstone gas reservoirs. These reservoirs are buried over 5000 m deep and their porosity ranges from 4 to 8%. The in-situ stress significantly influences the quality of these tight sandstone reservoirs in the Bashkichik Formation, yet the underlying mechanism remains elusive. Focusing on the deep Bashkichik Formation in the central Kuqa Depression, this study undertakes a systematic and comprehensive evaluation of the in-situ stress in tight sandstone reservoirs. Leveraging extensive data from conventional logging, array acoustic logging, FMI imaging logging, hydraulic fracturing, and production, the research explores the impact of in-situ stress on the petrophysical properties and productivity of tight sandstone reservoirs. The findings reveal that the in-situ stress state in the Bashkichik Formation is characterized by σv > σH > σh, with both the maximum and minimum horizontal principal stresses exhibiting a strong positive correlation with fracture pressure. Evaluations using the wall rock collapse method and the drilling-induced fracture method indicate that the in-situ stress direction of the target layer is nearly NNW. Employing an improved Newberry model, the study achieves accurate predictions of the in-situ stress in the target layer, with an average error of merely 5%. Longitudinal bending-induced flexural folding deformation affects formation thickness, fracture development, and in-situ stress state, consequently influencing the petrophysical properties of tight sandstone reservoirs. This research underscores the intimate relationship between in-situ stress, petrophysical properties, and productivity in deep tight sandstone reservoirs. The productivity of the tight sandstone reservoirs in the Bashkichik Formation is directly governed by petrophysical properties and indirectly influenced by in-situ stress, with fractures serving as a crucial indicator of petrophysical conditions.