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<p>Conducting refined sequence stratigraphic division and sedimentary evolution research on the Permian Shanxi Formation Member 1 (Shan-1 Member) in the Qingyang Gas Field, Ordos Basin, provides a crucial geological foundation for refined reservoir evaluation and development planning of complex tight gas reservoirs in this area. Based on integrated analysis of core, drilling-logging, 3D seismic, laboratory analysis, and other datasets, through well-seismic integration, major se-quence boundaries and high-order transgressive surfaces were traced and correlated. Combined with well-log Daubechies wavelets (DB-wavelet) transform analysis, an isochronous stratigraphic framework for the Shan-1 Member was estab-lished, revealing evolutionary patterns of sedimentary sequences and discussing their controlling factors. Results indicate that the Shan-1 Member can be divided into one third-order sequence (SQ1), internally composed of lowstand (LST), transgressive (TST), and highstand (HST) systems tracts, further subdivided into five fourth-order sequences (s1–s5). Deltaic systems predominantly developed in the Shan-1 Member, with distribution of sedimentary sand bodies jointly controlled by micro-paleogeomorphology, paleocurrent direction, and lake-level fluctuations. During the LST period, limited accommodation space led to abundant sediment delivery by southwest-provenance paleo-drainage. Subaqueous distributary channels rapidly aggraded with multi-phase incision on micro-paleogeomorphologic slopes and depressions in the central study area, forming sand-rich belts characterized by compound distributary channels. During the TST period, lacustrine transgression caused overall retrogradation of sedimentary systems toward the SW provenance area. In the HST period, pronounced progradation occurred during s3–s5 intervals, with subaqueous distributary channels advancing long distances in ribbon-shaped patterns. Lake-level fluctuations controlled sedimentary facies migration, while internal high-frequency oscillations influenced variations in parasequence architecture. High-resolution sequence evolution analysis constrained at multiple scales and refined sedimentary paleogeographic reconstruction provide theoretical foundations for predicting distributions of analogous complex thin tight gas reservoirs.</p>

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Sequence Stratigraphy, Sedimentary Evolution and Controlling Factors of the Shan-1 Member in Permian Shanxi Formation, Qingyang Gas Field, Ordos Basin, Central China

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Qian-qian Fan,
  • Shi-qiang Xia,
  • Hui Xia,
  • Wei Wang,
  • Long Wang,
  • Yan Wang,
  • Shi-cheng Wang,
  • Shuai-shuai Feng,
  • Wei Zhang,
  • Ya Li,
  • Ping Liu,
  • Qian-yun Dong

摘要

Conducting refined sequence stratigraphic division and sedimentary evolution research on the Permian Shanxi Formation Member 1 (Shan-1 Member) in the Qingyang Gas Field, Ordos Basin, provides a crucial geological foundation for refined reservoir evaluation and development planning of complex tight gas reservoirs in this area. Based on integrated analysis of core, drilling-logging, 3D seismic, laboratory analysis, and other datasets, through well-seismic integration, major se-quence boundaries and high-order transgressive surfaces were traced and correlated. Combined with well-log Daubechies wavelets (DB-wavelet) transform analysis, an isochronous stratigraphic framework for the Shan-1 Member was estab-lished, revealing evolutionary patterns of sedimentary sequences and discussing their controlling factors. Results indicate that the Shan-1 Member can be divided into one third-order sequence (SQ1), internally composed of lowstand (LST), transgressive (TST), and highstand (HST) systems tracts, further subdivided into five fourth-order sequences (s1–s5). Deltaic systems predominantly developed in the Shan-1 Member, with distribution of sedimentary sand bodies jointly controlled by micro-paleogeomorphology, paleocurrent direction, and lake-level fluctuations. During the LST period, limited accommodation space led to abundant sediment delivery by southwest-provenance paleo-drainage. Subaqueous distributary channels rapidly aggraded with multi-phase incision on micro-paleogeomorphologic slopes and depressions in the central study area, forming sand-rich belts characterized by compound distributary channels. During the TST period, lacustrine transgression caused overall retrogradation of sedimentary systems toward the SW provenance area. In the HST period, pronounced progradation occurred during s3–s5 intervals, with subaqueous distributary channels advancing long distances in ribbon-shaped patterns. Lake-level fluctuations controlled sedimentary facies migration, while internal high-frequency oscillations influenced variations in parasequence architecture. High-resolution sequence evolution analysis constrained at multiple scales and refined sedimentary paleogeographic reconstruction provide theoretical foundations for predicting distributions of analogous complex thin tight gas reservoirs.