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Investigating the distribution patterns of hydrates in the pore spaces of sedimentary rocks and their resistivity characteristics is crucial for understanding and predicting the storage and extraction of natural gas hydrates. However, CT and resistivity joint measurements indicate that the resistivity measurements of Tetrahydrofuran (THF) hydrates in sandstone sediments do not fully conform to the Archie model.To address this issue and gain a deeper understanding of the complex petrophysical relationships in THF hydrate sediments, this study established digital rock based on the hydrate distribution from in-situ CT scans by segmenting the three-dimensional grayscale images of the sediments. The spatial distribution of hydrates within the sediment pores was then simulated using the Diffusion-Limited Cluster Aggregation (DLCA) model. Subsequently, the resistivity of sediments at various hydrate saturations is determined using the finite element method. Which offers novel insights and methodologies for understanding the petrophysical characteristics.

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Study on the Distribution Patterns and Resistivity Characteristics of THF Hydrates in Sandstone Sediments

  • 会议论文

  • 发表日期：

    2025年

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  • Zizeng Li,
  • Ming Chen,
  • Qin Dai,
  • Fei Xian,
  • Min Li,
  • Jiamin Hu,
  • Chenyu Li,
  • Jian Hou,
  • Xuefeng Liu

摘要

Investigating the distribution patterns of hydrates in the pore spaces of sedimentary rocks and their resistivity characteristics is crucial for understanding and predicting the storage and extraction of natural gas hydrates. However, CT and resistivity joint measurements indicate that the resistivity measurements of Tetrahydrofuran (THF) hydrates in sandstone sediments do not fully conform to the Archie model.To address this issue and gain a deeper understanding of the complex petrophysical relationships in THF hydrate sediments, this study established digital rock based on the hydrate distribution from in-situ CT scans by segmenting the three-dimensional grayscale images of the sediments. The spatial distribution of hydrates within the sediment pores was then simulated using the Diffusion-Limited Cluster Aggregation (DLCA) model. Subsequently, the resistivity of sediments at various hydrate saturations is determined using the finite element method. Which offers novel insights and methodologies for understanding the petrophysical characteristics.