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<p>Research on deep-water fine-grained reservoirs in fan delta fronts, exemplified by the Hetaoyuan Formation in the eastern Nanxiang Basin, is crucial for unconventional oil and gas exploration. Analysis of core samples, thin sections, and well data of the He 3 Member in the eastern Nanxiang Basin reveals that sandstone types and rock debris content indicate proximity to source deposits. Hydrocarbon enrichment is significantly influenced by sand body distribution, local structures, and physical properties. The far sand bar and river channel flanks are key for hydrocarbon accumulation, with hydrodynamic conditions and sand body quality facilitating migration. The anticlinal nose is a primary migration area, but limited by the scale of underwater channels and sand bars, restricting hydrocarbon accumulation. Physical property improvements in the Hetaoyuan Formation, influenced by fluid expansion and brittle minerals, are critical for large-scale hydrocarbon accumulation.</p>

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Reservoir properties of fine-grained clastic interval and its control on hydrocarbon accumulation: a case study of Hetaoyuan formation

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Huan Wang,
  • Fang Shen,
  • Yunfei Feng,
  • Yingwei Di

摘要

Research on deep-water fine-grained reservoirs in fan delta fronts, exemplified by the Hetaoyuan Formation in the eastern Nanxiang Basin, is crucial for unconventional oil and gas exploration. Analysis of core samples, thin sections, and well data of the He 3 Member in the eastern Nanxiang Basin reveals that sandstone types and rock debris content indicate proximity to source deposits. Hydrocarbon enrichment is significantly influenced by sand body distribution, local structures, and physical properties. The far sand bar and river channel flanks are key for hydrocarbon accumulation, with hydrodynamic conditions and sand body quality facilitating migration. The anticlinal nose is a primary migration area, but limited by the scale of underwater channels and sand bars, restricting hydrocarbon accumulation. Physical property improvements in the Hetaoyuan Formation, influenced by fluid expansion and brittle minerals, are critical for large-scale hydrocarbon accumulation.