<p>The ultra-deep strike-slip fault-controlled hydrocarbon reservoirs in the Shunbei area are crucial for increasing reserves and production. However, the genesis mechanisms of the pressure-ridge structures and their reservoir-controlled patterns are not well understood, which directly limits exploration progress in this area. This study focuses on the strike-slip fault zones in the eastern Shunbei area. Based on fault structure analysis and finite element numerical simulation methods, the mechanical conditions and background of the formation of the pressure-ridge structures are investigated. Combined with typical drilling, 3D seismic data, and numerical simulation results, the reservoir-controlled pattern of strike-slip fault pressure-ridge structures is clarified. The results indicate that the formation of the pressure-ridge structures involves two main steps, initially, a near-vertical fault forms, followed by strong lateral compression. Additionally, the presence of the weak overlying cap rocks is essential for the development of these structures. In the lateral direction, the reservoir development exhibits a characteristic structure of a <i>central fault core flanked by fracture zones</i>. Vertically, it demonstrates a structure of <i>shallow tensile cavities with weak compressional shear fractures, transitioning to deeper compressional breccia zones accompanied by strong compressional shear fractures</i>. High-quality reservoirs are predominantly formed in the deeper layers along the fault. These findings are significant for enhancing the understanding of the genesis mechanisms of strike-slip faults within cratons in the Tarim Basin and for the exploration and evaluation of ultra-deep fault-controlled reservoirs in the Shunbei area.</p>

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Study on the mechanical genesis mechanism and reservoir-controlled pattern of strike-slip fault pressure-ridge structures in the Shunbei Area, Tarim Basin

  • Zhixing Ru,
  • Xinjing Yu,
  • Yingtao Li,
  • Huabiao Qiu,
  • Shuang Liu

摘要

The ultra-deep strike-slip fault-controlled hydrocarbon reservoirs in the Shunbei area are crucial for increasing reserves and production. However, the genesis mechanisms of the pressure-ridge structures and their reservoir-controlled patterns are not well understood, which directly limits exploration progress in this area. This study focuses on the strike-slip fault zones in the eastern Shunbei area. Based on fault structure analysis and finite element numerical simulation methods, the mechanical conditions and background of the formation of the pressure-ridge structures are investigated. Combined with typical drilling, 3D seismic data, and numerical simulation results, the reservoir-controlled pattern of strike-slip fault pressure-ridge structures is clarified. The results indicate that the formation of the pressure-ridge structures involves two main steps, initially, a near-vertical fault forms, followed by strong lateral compression. Additionally, the presence of the weak overlying cap rocks is essential for the development of these structures. In the lateral direction, the reservoir development exhibits a characteristic structure of a central fault core flanked by fracture zones. Vertically, it demonstrates a structure of shallow tensile cavities with weak compressional shear fractures, transitioning to deeper compressional breccia zones accompanied by strong compressional shear fractures. High-quality reservoirs are predominantly formed in the deeper layers along the fault. These findings are significant for enhancing the understanding of the genesis mechanisms of strike-slip faults within cratons in the Tarim Basin and for the exploration and evaluation of ultra-deep fault-controlled reservoirs in the Shunbei area.