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<p>This study investigates how boundary fault activity and growth controlled stratigraphic infilling patterns in the Ludong Sag, a single-faulted dustpan-shaped continental lacustrine basin. Through integrated analysis of core samples, well logs, and seismic profiles, we reconstructs the activity intensity and segmented growth patterns of the steep-slope boundary fault during the deposition of the Jiufotang Formation. Additionally, we classify sedimentary facies architectures and propose a genetic model to elucidate fault-driven sedimentation dynamics. During the Jiufotang Formation period, the Ludong Sag experienced significant rifting. Seismic reflection data allowed subdivision of the stratigraphy into upper, middle, and lower intervals. Integrated analysis of fault throw versus line backstripping curves, combined with well-seismic calibration, revealed that intense boundary fault activity during the Lower Jiufotang stage rapidly increased accommodation space. This expansion promoted rapid clastic sediment accumulation on the boundary fault's hanging wall. Furthermore, fault segmentation led to the development of two distinct nearshore subaqueous fan systems. During the Middle Jiufotang stage, boundary fault activity markedly declined. Reduced accommodation space (due to prior sedimentary infilling) and gentler paleotopographic slopes resulted in widespread but thin sand deposition, creating a basin-wide "sand-rich" condition. A fan delta system developed, characterized by extensive distribution, thin layers, and finer-grained lithologies. In the Upper Jiufotang stage, boundary fault activity peaked with diminished segmentation. Two superimposed nearshore subaqueous fan systems formed, while the depocenter's deep lacustrine environment facilitated the deposition of thick mudstone-shale sequences.</p>

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The Characteristics of Differential Sedimentary Filling Under the Activity of Boundary Faults in Continental Faulted Lake Basins

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Xuntao Yu,
  • Jiaxue Pei,
  • Bo Ran,
  • Yunlong Fu,
  • Jiaming Zhang,
  • Liang Hao,
  • Yunfeng Zhang

摘要

This study investigates how boundary fault activity and growth controlled stratigraphic infilling patterns in the Ludong Sag, a single-faulted dustpan-shaped continental lacustrine basin. Through integrated analysis of core samples, well logs, and seismic profiles, we reconstructs the activity intensity and segmented growth patterns of the steep-slope boundary fault during the deposition of the Jiufotang Formation. Additionally, we classify sedimentary facies architectures and propose a genetic model to elucidate fault-driven sedimentation dynamics. During the Jiufotang Formation period, the Ludong Sag experienced significant rifting. Seismic reflection data allowed subdivision of the stratigraphy into upper, middle, and lower intervals. Integrated analysis of fault throw versus line backstripping curves, combined with well-seismic calibration, revealed that intense boundary fault activity during the Lower Jiufotang stage rapidly increased accommodation space. This expansion promoted rapid clastic sediment accumulation on the boundary fault's hanging wall. Furthermore, fault segmentation led to the development of two distinct nearshore subaqueous fan systems. During the Middle Jiufotang stage, boundary fault activity markedly declined. Reduced accommodation space (due to prior sedimentary infilling) and gentler paleotopographic slopes resulted in widespread but thin sand deposition, creating a basin-wide "sand-rich" condition. A fan delta system developed, characterized by extensive distribution, thin layers, and finer-grained lithologies. In the Upper Jiufotang stage, boundary fault activity peaked with diminished segmentation. Two superimposed nearshore subaqueous fan systems formed, while the depocenter's deep lacustrine environment facilitated the deposition of thick mudstone-shale sequences.