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<p>Research on the sedimentary facies of the Middle Permian Maokou Formation in the Sichuan Basin has predominantly concentrated on inner-platform settings, with the evolution of its platform-margin facies belts being less well understood. This study, utilizing integrated well-log, core and seismic data from the Jiange-Yuanba area, employs sequence stratigraphy, sedimentology and seismic geomorphology to delineate sequence architecture, interpret depositional environments and characterize platform-margin development. Key findings include: (1) The Maokou Formation comprises three third-order sequences (SQ1–SQ3); SQ1 features subdued palaeotopography, whereas SQ2–SQ3 exhibit pronounced south-thick/north-thin differential subsidence. (2) Deposition evolved from an early gentle carbonate ramp to a progradational, rimmed carbonate platform during its middle–late stages. (3) Whereas SQ1 contains sporadic, low-energy shoals on subtle palaeo-highs, SQ2–SQ3 developed NW–SE-trending, vertically stacked platform-margin shoal complexes. These shoals constitute potential large-scale, high-quality reservoirs and represent key exploration targets. This work refines the sedimentary model for the northwestern Sichuan Basin and provides insights for hydrocarbon exploration in the Maokou Formation.</p>

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Sedimentary characteristics and evolutionary processes of platform margin shoals of the Permian Maokou Formation in the Jiange-Yuanba area, Sichuan Basin, SW China

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Wei Wei,
  • Hong Liu,
  • Dong Wang,
  • Xin Hu,
  • Lei Tan,
  • Bai Liu,
  • Chen Yin,
  • Wen-Jie Yang

摘要

Research on the sedimentary facies of the Middle Permian Maokou Formation in the Sichuan Basin has predominantly concentrated on inner-platform settings, with the evolution of its platform-margin facies belts being less well understood. This study, utilizing integrated well-log, core and seismic data from the Jiange-Yuanba area, employs sequence stratigraphy, sedimentology and seismic geomorphology to delineate sequence architecture, interpret depositional environments and characterize platform-margin development. Key findings include: (1) The Maokou Formation comprises three third-order sequences (SQ1–SQ3); SQ1 features subdued palaeotopography, whereas SQ2–SQ3 exhibit pronounced south-thick/north-thin differential subsidence. (2) Deposition evolved from an early gentle carbonate ramp to a progradational, rimmed carbonate platform during its middle–late stages. (3) Whereas SQ1 contains sporadic, low-energy shoals on subtle palaeo-highs, SQ2–SQ3 developed NW–SE-trending, vertically stacked platform-margin shoal complexes. These shoals constitute potential large-scale, high-quality reservoirs and represent key exploration targets. This work refines the sedimentary model for the northwestern Sichuan Basin and provides insights for hydrocarbon exploration in the Maokou Formation.