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<p>In recent years, significant breakthroughs have been achieved in deep carbonate hydrocarbon exploration in the Shunbei area of the Tarim Basin in China. However, the sequence development models and their key controlling factors remain poorly understood. Based on global eustatic changes, integrated with drilling, outcrop, and seismic data, this study divides the Middle-Lower Ordovician carbonate sequences in the Shunbei area, clarifies the sedimentary facies distribution patterns within the sequence stratigraphic framework, and establishes a sequence development model for these carbonates. The results indicate that: (1) The Middle-Lower Ordovician carbonates in the Shunbei area can be subdivided into 8 third-order sequences; (2) Sedimentary facies within the sequence framework exhibit an east-to-west distribution pattern of “carbonate platform-platform margin-slope-basin”; (3) Three sequence development models are identified in the Ordovician carbonates: transgressive systems tract (TST), highstand system tract(HST) and lowstand systems tract (LST); (4) The primary reservoir spaces in the Ordovician carbonates are medium- to large-scale karst caves, with lowstand and highstand karstification controlled by third-order sequence boundaries acting as the dominant factors in reservoir formation. This research provides novel insights for deep carbonate hydrocarbon exploration in the Tarim Basin and analogous basins worldwide.</p>

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Sequence of middle-lower Ordovician in Shunbei area of Tarim Basin, China, and its geological significance

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Rui Xiong,
  • Heng Fu,
  • Yong Li,
  • Caizhu Xie,
  • Ronggang Wang,
  • Shaoze Zhao,
  • Chuan Xu,
  • Chongyang Xiao

摘要

In recent years, significant breakthroughs have been achieved in deep carbonate hydrocarbon exploration in the Shunbei area of the Tarim Basin in China. However, the sequence development models and their key controlling factors remain poorly understood. Based on global eustatic changes, integrated with drilling, outcrop, and seismic data, this study divides the Middle-Lower Ordovician carbonate sequences in the Shunbei area, clarifies the sedimentary facies distribution patterns within the sequence stratigraphic framework, and establishes a sequence development model for these carbonates. The results indicate that: (1) The Middle-Lower Ordovician carbonates in the Shunbei area can be subdivided into 8 third-order sequences; (2) Sedimentary facies within the sequence framework exhibit an east-to-west distribution pattern of “carbonate platform-platform margin-slope-basin”; (3) Three sequence development models are identified in the Ordovician carbonates: transgressive systems tract (TST), highstand system tract(HST) and lowstand systems tract (LST); (4) The primary reservoir spaces in the Ordovician carbonates are medium- to large-scale karst caves, with lowstand and highstand karstification controlled by third-order sequence boundaries acting as the dominant factors in reservoir formation. This research provides novel insights for deep carbonate hydrocarbon exploration in the Tarim Basin and analogous basins worldwide.