Acta Geodynamica et Geomaterialia

Title: ANALYSES OF THE FACTORS INFLUENCING SANDSTONE THERMAL CONDUCTIVITY
Authors: Sun Qiang, Chen Shen-en, Gao Qiao, Zhang Weiqiang, Geng Jishi and Zhang Yuliang
DOI: 10.13168/AGG.2017.0001
Journal: Acta Geodynamica et Geomaterialia, Vol. 14, No. 2 (186), Prague 2017
Full Text: PDF file (0.4 MB)
Keywords: sandstone, thermal conductivity, porosity, grain fabrics, moisture content
Abstract: Thermal conductivity is a thermodynamic parameter playing an important role in the heat transfer process in geothermic and numerous engineering fields. In order to analyze the factors influencing the thermal conductivity of sandstone, the data of thermal conductivity obtained from the literatures in China and abroad were summarized. The influences of porosity, moisture and fluidic content, pressure and temperature on the thermal conductivity were analyzed and discussed. The survey results show that the thermal conductivity of sandstones mainly depends on its mineralogical composition, microstructure, porosity, saturation, pressure and temperature. It increases with the degree of fluid saturation and pressure, while decreases with the increase of porosity and temperature. The result of analysis shows that when the degree of saturation is higher than 15%, the thermal conductivity curve is a linear function of the degree of saturation.