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<p>The complex deformation characteristics of small-scale intraplate strike-slip faults critically control hydrocarbon reservoir formation and distribution in the Tarim Basin. This study investigates intraplate strike-slip faults on the northern slope of the Tazhong Uplift using high-resolution seismic data to delineate structural deformation variations within the Shun-1 fault zone and decipher its genetic mechanisms. Results reveal that the Shun-1 zone exhibits a stratified deformation pattern characterized by high-angle basement faults underlying en echelon faults, manifesting as “compression below and extension above.” The NE-trending basement faults govern regional structural frameworks, while overlying NW-oriented en echelon faults represent secondary normal fault systems. Integrated tectonic analysis indicates that these en echelon structures result from sinistral slip along the NE-trending basement faults, driven by shear components derived from southeast-directed compressional forces during intense folding-orogenic activities of the Altyn Tagh belt. This mechanism aligns with the fault zone’s segmented deformation intensity—stronger in the south and weaker in the north—clarifying vertical and lateral structural variations of the Shun-1 fault system. These findings provide critical constraints for Paleozoic strike-slip fault-controlled hydrocarbon exploration in the Tazhong region.</p>

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Investigation into the Differential Structural Deformation of Intraplate Small-Scale Strike-Slip Faults:A Case Study of the Shun-1 Strike-Slip Fault Zone in the Northern Slope of Tazhong Uplift, Tarim Basin

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Xiao-ying Han,
  • Liang-jie Tang,
  • Shi-qiang Xia,
  • Zi-cheng Cao,
  • Peng Zhang

摘要

The complex deformation characteristics of small-scale intraplate strike-slip faults critically control hydrocarbon reservoir formation and distribution in the Tarim Basin. This study investigates intraplate strike-slip faults on the northern slope of the Tazhong Uplift using high-resolution seismic data to delineate structural deformation variations within the Shun-1 fault zone and decipher its genetic mechanisms. Results reveal that the Shun-1 zone exhibits a stratified deformation pattern characterized by high-angle basement faults underlying en echelon faults, manifesting as “compression below and extension above.” The NE-trending basement faults govern regional structural frameworks, while overlying NW-oriented en echelon faults represent secondary normal fault systems. Integrated tectonic analysis indicates that these en echelon structures result from sinistral slip along the NE-trending basement faults, driven by shear components derived from southeast-directed compressional forces during intense folding-orogenic activities of the Altyn Tagh belt. This mechanism aligns with the fault zone’s segmented deformation intensity—stronger in the south and weaker in the north—clarifying vertical and lateral structural variations of the Shun-1 fault system. These findings provide critical constraints for Paleozoic strike-slip fault-controlled hydrocarbon exploration in the Tazhong region.