Thermal Conductivity Characterization of Geological Materials

Thermal conductivity characterisation of geological materials examines how heat is transmitted through rocks, soils and sediments under varying environmental conditions. This field underpins our understanding of geothermal energy extraction, hydrocarbon maturation, heat flow in continental and oceanic crust, and the long‐term safety assessment of geological repositories. Measurements are made in the laboratory on core samples and in situ by borehole logging, complemented by theoretical models that account for mineral composition, pore structure, fluid saturation, temperature, pressure and anisotropy. Key factors influencing conductive heat transport include the volume fractions and arrangement of high‐conductivity minerals such as quartz and dolomite, the proportion of void space (porosity), and the nature of pore‐filling fluids whether air, water or hydrocarbons. Mixing laws, notably the geometric mean model, provide practical approaches to predict bulk conductivity from constituent properties, while advanced imaging and ultrasonic methods enable non-destructive estimation via petrophysical proxies. Recent trends highlight multi-scale integration of microstructural analysis with machine-learning algorithms to reduce uncertainties in heterogenous formations. By coupling accurate thermal property data with subsurface models, researchers enhance predictions of temperature distributions, improve the design of geothermal installations and inform strategies for unconventional resource recovery, carbon storage and nuclear waste isolation across diverse geological settings.

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Thermal Conductivity Characterization of Geological Materials publication trend

The graph below shows the total number of articles in thermal conductivity characterization of geological materials across all publications each year (not limited to Nature Index journals).

Technical terms

Thermal conductivity: The ability of a material to conduct heat, expressed in watts per metre-kelvin (W/m·K).

Porosity: The fraction of a rock or sediment’s volume occupied by void spaces, influencing fluid content and heat transfer.

Thermal diffusivity: A measure of how quickly a material can conduct thermal energy relative to its capacity to store heat, defined as thermal conductivity divided by the product of density and specific heat capacity.

Pore saturation: The degree to which pore spaces in a geological material are filled with fluids such as water or air, strongly affecting bulk thermal properties.

Specific heat capacity: The amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius or kelvin (J/kg·K).

Geometric mean model: A predictive mixing law estimating the effective thermal conductivity of heterogeneous materials based on the conductivities and volumetric proportions of individual constituents.

References

1. Thermal properties of rock core samples and their correlations with other physical properties in the volcanic region surrounding the Aso Volcano. Thermal Science and Engineering Progress (2025).
2. Study on the Thermophysical Properties and Influencing Factors of Regional Surface Shallow Rock and Soil in China. Frontiers in Earth Science (2022).
3. Effect of Temperature on the Thermal Conductivity of Rocks and Its Implication for In Situ Correction. Geofluids (2021).