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Medium-deep ground source heat pumps are an important low-carbon heating technology. This study proposes a hybrid thermal conductivity model based on kilometer-scale formation variations. Well logging at a factory site in Shenyang, China, revealed that the upper 0–750 m is Cenozoic strata with higher porosity and argillaceous content, while the underlying Archean formation consists of dense, highly conductive rocks. Permeability is low in deep formations, indicating few aquifers. Borehole No.02, with the lowest porosity and argillaceous content, shows the highest thermal conductivity (2.64 W/(m·K)). Overall, the results highlight the strong influence of geological properties on the thermal performance of medium-deep borehole heat exchangers.

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Obtaining Thermal Conductivity of Medium-Deep Geothermal Boreholes: A Hybrid Modelling Based on Geological Test

  • 会议论文

  • 发表日期：

    2025年

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  • Yuelong Yu,
  • Shihao Dong,
  • Long Ni

摘要

Medium-deep ground source heat pumps are an important low-carbon heating technology. This study proposes a hybrid thermal conductivity model based on kilometer-scale formation variations. Well logging at a factory site in Shenyang, China, revealed that the upper 0–750 m is Cenozoic strata with higher porosity and argillaceous content, while the underlying Archean formation consists of dense, highly conductive rocks. Permeability is low in deep formations, indicating few aquifers. Borehole No.02, with the lowest porosity and argillaceous content, shows the highest thermal conductivity (2.64 W/(m·K)). Overall, the results highlight the strong influence of geological properties on the thermal performance of medium-deep borehole heat exchangers.