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<p>This study investigates the characteristics and controlling factors of deep-to-ultra-deep shale reservoirs in the Permian Wujiaping Formation, Eastern Sichuan, to address key questions on reservoir feasibility, pore evolution, and quality determinants at depths of 4500–6000&#xa0;m, thereby guiding future exploration. Our research is based on a systematic analysis of critical data from multiple shale gas drilling wells penetrating the 4,500 to 6,000&#xa0;m depth interval in the Hongxing area. Reservoir porosity remains effectively high and shows minimal reduction within the 4500–6000&#xa0;m depth range. Pore systems evolve with depth: organic pores become smaller, less connected, and morphologically simpler. Reservoir quality is primarily controlled by the synergy of biogenic silica (as the fundamental substrate for pores) and fluid over-pressure (as the key mechanism for porosity preservation). The deep-to-ultra-deep section holds vast potential, with a preliminary resource estimate of 7542.69 × 10⁸ m³ for the second section of the Wujiaping Formation in the study area. This study confirms the significant potential of deep shale gas exploration, highlighting that high-quality reservoirs can develop and be maintained even at ultra-deep conditions, governed by specific geological factors.</p>

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Characteristics of ultra-deep shale reservoirs of the Permian Wujiaping Formation and its significance for shale gas exploration in the Hongxing area, East Sichuan, China

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Luo Bin,
  • Xiao Suyun,
  • Zhao Shuai,
  • Zhang Daohong,
  • Zeng Furong

摘要

This study investigates the characteristics and controlling factors of deep-to-ultra-deep shale reservoirs in the Permian Wujiaping Formation, Eastern Sichuan, to address key questions on reservoir feasibility, pore evolution, and quality determinants at depths of 4500–6000 m, thereby guiding future exploration. Our research is based on a systematic analysis of critical data from multiple shale gas drilling wells penetrating the 4,500 to 6,000 m depth interval in the Hongxing area. Reservoir porosity remains effectively high and shows minimal reduction within the 4500–6000 m depth range. Pore systems evolve with depth: organic pores become smaller, less connected, and morphologically simpler. Reservoir quality is primarily controlled by the synergy of biogenic silica (as the fundamental substrate for pores) and fluid over-pressure (as the key mechanism for porosity preservation). The deep-to-ultra-deep section holds vast potential, with a preliminary resource estimate of 7542.69 × 10⁸ m³ for the second section of the Wujiaping Formation in the study area. This study confirms the significant potential of deep shale gas exploration, highlighting that high-quality reservoirs can develop and be maintained even at ultra-deep conditions, governed by specific geological factors.