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<p>The Jurassic Shaximiao Formation in the central Sichuan Basin is a major source of tight gas reservoirs in China, with its formation primarily controlled by hydrocarbon source faults and the spatial distribution of high-quality channel sand bodies. In the Qiulin area, the structure is relatively gentle, and fault identification on seismic profiles is challenging due to the poor development of faults and the thin, intercut nature of the Shaximiao channel sand bodies. The similarities in physical properties between the reservoir and surrounding rocks further complicate conventional seismic interpretation. To overcome these challenges, we applied a combination of structurally oriented filtering and multi-angle scanning techniques, which enhanced fault identification and clarified breakpoints in seismic data. This approach enabled the effective recognition of hydrocarbon source faults. Additionally, we developed a technical workflow that transitioned from qualitative analysis to quantitative prediction, focusing on lithology, physical properties, and fluid phases. Key technologies, including multi-attribute channel carving, overlapping channel period stripping, and pre-stack elastic parameter inversion, were used to accurately map channel distribution and predict high-quality reservoir zones with high gas content. Our findings indicate that the most favourable zones for tight gas development are the high-quality channel sand bodies linked by hydrocarbon source faults. The accuracy of our predictions was validated through the successful deployment of horizontal wells, all of which encountered high-yield gas flows. This technology provides vital support for well site deployment and horizontal well design in the Shaximiao Formation's tight gas reservoirs.</p>

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Predicting high-yield tight gas sweet spots in the Qiulin area, Sichuan Basin

  • 期刊论文

  • 发表日期：

    2025年3月29日

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  • Xiaoer Chen,
  • Kun Fan,
  • Changyong Wang,
  • Shenghong Wu,
  • Rongcai Zheng,
  • Xiaoli Mi,
  • Jubiao Bao

摘要

The Jurassic Shaximiao Formation in the central Sichuan Basin is a major source of tight gas reservoirs in China, with its formation primarily controlled by hydrocarbon source faults and the spatial distribution of high-quality channel sand bodies. In the Qiulin area, the structure is relatively gentle, and fault identification on seismic profiles is challenging due to the poor development of faults and the thin, intercut nature of the Shaximiao channel sand bodies. The similarities in physical properties between the reservoir and surrounding rocks further complicate conventional seismic interpretation. To overcome these challenges, we applied a combination of structurally oriented filtering and multi-angle scanning techniques, which enhanced fault identification and clarified breakpoints in seismic data. This approach enabled the effective recognition of hydrocarbon source faults. Additionally, we developed a technical workflow that transitioned from qualitative analysis to quantitative prediction, focusing on lithology, physical properties, and fluid phases. Key technologies, including multi-attribute channel carving, overlapping channel period stripping, and pre-stack elastic parameter inversion, were used to accurately map channel distribution and predict high-quality reservoir zones with high gas content. Our findings indicate that the most favourable zones for tight gas development are the high-quality channel sand bodies linked by hydrocarbon source faults. The accuracy of our predictions was validated through the successful deployment of horizontal wells, all of which encountered high-yield gas flows. This technology provides vital support for well site deployment and horizontal well design in the Shaximiao Formation's tight gas reservoirs.