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<p>The Bongor Basin, a part of Central African Rift System (CARS), presents a complex geological history marked by phases of strike-slip extension in the Early Cretaceous, weak extension in the Late Cretaceous, and significant reformation through intense inversion and uplifting during the Late Cretaceous–Paleocene. These tectonic inversions have played a critical role in shaping the basin’s hydrocarbon potential. This study employs balanced cross section techniques to demonstrate that the inversion processes reactivated both pre-existing and newly formed faults, creating anticlines that are vital for hydrocarbon trapping. The regional tectonic compressional forces have driven the principal extensional phases associated with rift formation and subsequent inversion events. As a result, these tectonic processes have facilitated the creation of structural traps and modified sedimentary pathways, which are essential for hydrocarbon migration and entrapment. Our findings indicate that the initial extensional phase led to the formation of fault-bounded depocenters that subsequently underwent inversion, enhancing trap integrity and establishing favorable conditions for hydrocarbon preservation. The balanced cross section methodology offers valuable insights into the subsurface geometry and deformation history, highlighting prospective areas with high hydrocarbon potential. This research emphasizes the necessity of integrating studies of tectonic evolution with hydrocarbon exploration strategies in rift basins, ultimately contributing to more effective resource exploitation.</p>

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The phase of extension and inversion in the Bongor Basin and its impact on the hydrocarbon accumulation

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Ying Jia,
  • Minqiang Jia,
  • Hakro Ahmed Suhail,
  • Hong Liu,
  • Yadi Wang,
  • Yingxiao Wang,
  • Hao Liu

摘要

The Bongor Basin, a part of Central African Rift System (CARS), presents a complex geological history marked by phases of strike-slip extension in the Early Cretaceous, weak extension in the Late Cretaceous, and significant reformation through intense inversion and uplifting during the Late Cretaceous–Paleocene. These tectonic inversions have played a critical role in shaping the basin’s hydrocarbon potential. This study employs balanced cross section techniques to demonstrate that the inversion processes reactivated both pre-existing and newly formed faults, creating anticlines that are vital for hydrocarbon trapping. The regional tectonic compressional forces have driven the principal extensional phases associated with rift formation and subsequent inversion events. As a result, these tectonic processes have facilitated the creation of structural traps and modified sedimentary pathways, which are essential for hydrocarbon migration and entrapment. Our findings indicate that the initial extensional phase led to the formation of fault-bounded depocenters that subsequently underwent inversion, enhancing trap integrity and establishing favorable conditions for hydrocarbon preservation. The balanced cross section methodology offers valuable insights into the subsurface geometry and deformation history, highlighting prospective areas with high hydrocarbon potential. This research emphasizes the necessity of integrating studies of tectonic evolution with hydrocarbon exploration strategies in rift basins, ultimately contributing to more effective resource exploitation.