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<p>Investigating the thermal characteristics of both the reservoir overburden and sediments is conducive to comprehending the coupling mechanism of the thermal, hydraulic, mechanical, and chemical multi-physical fields during deep-sea hydrate mining. Considering that marine sediments are rich in organic matter and mostly in a saturated state, artificially-prepared silty clay sediment was used as the base material, and humic acid was added to make saturated sediment samples with different organic matter contents. The transient hot-wire technique measured the thermal conductivity of sediment under different temperatures, porosities, and organic matter contents. Results show that thermal conductivity decreases with increasing temperature, organic matter content, and porosity. The Campbell model was modified with empirical parameters related to quartz content, water content, temperature, and organic matter content. The modified model is used to forecast sediment thermal conductivity. The prediction - measurement error of this model is within 10%. This indicates that the model can accurately estimate the thermal conductivity of cohesive soils containing organic matter.</p>

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Study on the influence of temperature on the thermal conductivity of organic-rich sediments

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Xinrui Zhang,
  • Haojie Shi,
  • Gangqiang Kong,
  • Pengfei Xie,
  • Xiaoliang Xu,
  • Xin Chen,
  • Zihua Jiang

摘要

Investigating the thermal characteristics of both the reservoir overburden and sediments is conducive to comprehending the coupling mechanism of the thermal, hydraulic, mechanical, and chemical multi-physical fields during deep-sea hydrate mining. Considering that marine sediments are rich in organic matter and mostly in a saturated state, artificially-prepared silty clay sediment was used as the base material, and humic acid was added to make saturated sediment samples with different organic matter contents. The transient hot-wire technique measured the thermal conductivity of sediment under different temperatures, porosities, and organic matter contents. Results show that thermal conductivity decreases with increasing temperature, organic matter content, and porosity. The Campbell model was modified with empirical parameters related to quartz content, water content, temperature, and organic matter content. The modified model is used to forecast sediment thermal conductivity. The prediction - measurement error of this model is within 10%. This indicates that the model can accurately estimate the thermal conductivity of cohesive soils containing organic matter.