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<p>The strike-slip fault can serve as reservoir spaces and migration channels for hydrocarbon, which is of great significance for hydrocarbon exploration. Taking the SB16 fault as the research object, the geometric and kinematic characteristics of it were analyzed through high-precision 3D seismic data analysis, and combined with the regional tectonic stress field background, a fault evolution model was established. The research results indicate that the SB16 fault has the characteristics of planar segmentation, longitudinal layering, and multi-stage superposition. On the plane, in deep formation, faults develop linearly along the NE trending, overlapping with each other to form uplift segment, pull-apart segment, and strike-slip segment. In shallow formation, the faults are manifested as NW trending en-echelon normal faults intersecting at a small angle with the principal displacement zone. Vertically, from deep to shallow formations, the faults are characterized by vertical fault, flower structure, and small graben. The SB16 fault is a left-lateral displacement, and the estimated displacement of the strike-slip is 1735&#xa0;m through three-dimensional seismic time slicing. The activity intensity of the uplift segment is strong, the activity intensity of the pull-apart segment is relatively weak, and the activity intensity of the strike-slip segment is generally weak. The activity intensity in the studying area has a characteristic of being strong in the south and weak in the north. The III phase of the Middle Caledonian was the formation period of faults. During this period, the ancient Kunlun Ocean closed and collided with the Tarim Plate. The compressive stress produced by the arc continent collision in the southeastern margin of the Tarim Basin led to the pre-existing fault activity and the formation of NE trending strike-slip faults. The Late Caledonian to Early Hercynian was the reactivation period of the faults. The further subduction of the ancient Kunlun Ocean resulted in the northward compressive stress in the southern Tarim Basin. The pre-exiting NE trending strike-slip faults were reactivated to form the en-echelon normal faults. The strike-slip faults stopped developing in the Late Hercynian.</p>

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Structural characteristics and evolution model of strike-slip fault in the Shunnan Area, Tarim Basin

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Teng Zhao,
  • Yuqing Liu,
  • Jibiao Zhang

摘要

The strike-slip fault can serve as reservoir spaces and migration channels for hydrocarbon, which is of great significance for hydrocarbon exploration. Taking the SB16 fault as the research object, the geometric and kinematic characteristics of it were analyzed through high-precision 3D seismic data analysis, and combined with the regional tectonic stress field background, a fault evolution model was established. The research results indicate that the SB16 fault has the characteristics of planar segmentation, longitudinal layering, and multi-stage superposition. On the plane, in deep formation, faults develop linearly along the NE trending, overlapping with each other to form uplift segment, pull-apart segment, and strike-slip segment. In shallow formation, the faults are manifested as NW trending en-echelon normal faults intersecting at a small angle with the principal displacement zone. Vertically, from deep to shallow formations, the faults are characterized by vertical fault, flower structure, and small graben. The SB16 fault is a left-lateral displacement, and the estimated displacement of the strike-slip is 1735 m through three-dimensional seismic time slicing. The activity intensity of the uplift segment is strong, the activity intensity of the pull-apart segment is relatively weak, and the activity intensity of the strike-slip segment is generally weak. The activity intensity in the studying area has a characteristic of being strong in the south and weak in the north. The III phase of the Middle Caledonian was the formation period of faults. During this period, the ancient Kunlun Ocean closed and collided with the Tarim Plate. The compressive stress produced by the arc continent collision in the southeastern margin of the Tarim Basin led to the pre-existing fault activity and the formation of NE trending strike-slip faults. The Late Caledonian to Early Hercynian was the reactivation period of the faults. The further subduction of the ancient Kunlun Ocean resulted in the northward compressive stress in the southern Tarim Basin. The pre-exiting NE trending strike-slip faults were reactivated to form the en-echelon normal faults. The strike-slip faults stopped developing in the Late Hercynian.