Thermal properties rocks

Thermal Properties and Temperature related Behavior of Rock/fluid Systems... 

Gehlin, S., 1998. Thermal Response Test, In-Sim Measurements of Thermal Properties in Hard Rock, Licentiate Thesis, No. 37, Lulea University of Technology, Department of Environmental Engineering, Division of Water Resources Engineering, 41 pp. 

Wrong assumption about thermal properties of the rock, i.e., thermal conduction. 

Sundberg, J. 1991. Termiska Egenskaper i Jord Och Berg [Thermal properties of soils and rock - in Swedish]. Statens geotekniska institut Report, Lin-koping, Sweden. 

Joeleht A. and Kukkonen I. T. (1998) Thermal properties of granuUte facies rocks in the Precambrian basement of Finland and Estonia. Tectonophysics 291, 195-203. 

Somerton, W.H., 1992. Thermal properties and temperature-related behavior of rock/fluid systems. Developments in Petroleum Science 37. Elsevier, Amsterdam, 257 pp. 

W.H. SOMERTON - Thermal Properties and Temperature Related Behavior of Rock/Fluid Systems... 

Table 2 shows the properties used for the coupled analysis. Thermal properties are the same for rock mass and bentonite. It is assumed that the repository consists of bentonite having very low permeability. To examine the uncertainty of up-scaling process on the performance assessment, the cases shown in Table 3 are examined. 

An interesting relation has been observed between thermal conductivity and density for the rock types at Aspo, and this may be used to evaluate the spatial distribution of the thermal properties from density logging. There is currently insufficient knowledge concerning the variation of thermal properties at different scales. If the whole observed variation within a rock type is based on the cm-m scale, the thermal influence at the canister scale is small. This is due to the fact that the small-scale variation in thermal properties is mainly averaged out on the 5-10 m scale. If the main variation within rock types is on the 5-10 m scale, there is probably a significant effect on the canister temperature. However, it is likely that the observed variation occurs on both these scales. 

The complete results from the various can be found in Fredriksson (2003). The results presented in this article focus on the influence of mechanical and thermal properties of the rock mass for the horizontal section located 1.5 m below the tunnel floor, and assuming the mean value for the major principal stress, ai=30MPa. 

In this study, the thermal properties of the rock mass were modified to take the effect of groundwater and latent heat of freezing into account. The result of the analysis with these modified thermal properties shows good agreement with the measured temperature distribution. 

In this study, briefly explained is the site investigation made in earlier design stage to determine the dimension of cavern. The predicted temperature distribution around cavern was compared with measured values during the 5 years of operation. Also a practical method to evaluate the thermal properties of Jointed rock mass was suggested and verified. 

To evaluate the thermal properties of rock, NX sized boreholes were drilled and rock specimens were sampled at the same level of rock cavern. 

Park et al (1999) conducted the research project on the prediction of temperature distribution around rock cavern on pilot scale in Korea. They proposed that the specific heat increased 25% and thermal conductivity is decreased 23% that of intact value from comparison of the predicted and measured temperature. They also proposed that change of thermal properties are caused from the effect of groundwater and joint for the reason that discontinuity makes thermal conductivity lower and water content makes thermal conductivity and specific heat higher. 

During the numerical calculation, thermal properties were changed into modified values considering the latent heat of freezing when temperature of rock mass is reached 0°C. The modification was made by using the numerical formula (1) and (2). And latent heat term is considered to evaluate the energy need to freezing the water in unit volume of rock mass. 

After the rock mass temperature reached -1 °C, thermal properties were changed into that of thermal properties calculated from 80% of rock mass and 20% of ice. Initial thermal properties and modified thermal properties are shown in table 4. 

Buntebarth G. and J.R. Schopper, 1998. Experimental and Theoretical Investigations on the Influence of Fluids, Solids and Interactions between them on Thermal Properties of Porous Rocks. Phys. Chem. Earth. Vol. 23, No.9-10 pp 1141-1146. 

Sundberg J. (1988). Thermal Properties of Soils and Rocks. Swedish Geotechnical Institute, Linkoping, Sweden. Report Number 35. 

It is meaningful to study the thermal properties of spider s silk thread from the heat resistant point of view since spider silks adhere to some objects such as rock and metal and may be heat-stable even at high temperatures between 60 °C and 100 °C. However, the thermal properties have not previously been studied, probably due to the difficulty in collecting draglines. Spider threads have been studied mainly from the morphological point of view. ... 

The mine shaft was excavated through layers of shale rock. Table 1 lists the thermal properties of the rock. For simplicity of the analysis presented here, the thermal properties of different rock compositions were assumed to be constant throughout the depth of the excavation regardless its temperature variation (thermal properties were temperature independent). 

Table 13.35. Physical, mechanical and thermal properties of selected rocks ... 

An important point to note when considering the cooling effect in reservoirs is that the thermal properties of the reservoir rocks do not vary substantially between rocks of a wide range of different types. Somerton (1958) has measured heat capacities and conductivities of a wide range of rock types from sandstones to shales, containing air, oil and water. The ranges of values obtained do not in most cases differ by more than 20% from those used in this paper. A similar range of values of conductivity is shown specifically for North Sea rocks by Evans (1977). It is not possible for a reservoir to contain... 

Evans, T. R. (1977) Thermal properties of North Sea rocks. Log Analyst 18, Part 2, 3. 

The fibrous fluorosilicates obtained in our study from mining rocks did not concede by their properties to the fibrous fluoramphiboles synthesized from chemical reactants. Furthermore, the thermal properties and chemical resistance of fluorosilicates from mining rocks were better than those of natural asbestos croddolite. The decomposition temperature of fluorosilicates from mining rocks was by 120-180°C higher compared with the natural and synthetic hydroxyl amphyboles (Hodgson, 1965 Khachatryan, 1969 Grigor eva et al., 1975). 

Some of my former students have followed the petrophysics way and helped me, for example, with experimental data—one of the rarest components in our science. Frank Bdmer has contributed valuable insight for electrical properties. Nina Gegenhuber made measurements of elastic and thermal properties and developed components of Rock Physics Templates. Edith Mliller-Huber contributed to carbonate properties and model calculations. 

Empirical fundamentals of rock physics are generated from measurements of rock samples under defined conditions (pressure and temperature). Laboratory measurements determine physical properties (for example pore spaces, or electrical, elastic, thermal properties) for different groups of rocks. 

TABLE 9.2 Thermal Properties of Rock-Forming Minerals... 

THERMAL PROPERTIES OF ROCKS—EXPERIMENTAL DATA 9.3.1 Overview... 

Vosteen and Schellschmidt (2003) compiled thermal properties of magmatic, metamorphic, and sedimentary rocks of the Eastern Alpine crust. Figure 9.3 shows mean values and ranges of variation of specific heat capacity as a function of temperature. 

Thermal properties of these two rock groups are controlled mainly by mineral composition and the influence of fractures. Alignment of mineral axes and fractures can create anisotropy this is characteristic for metamorphic rocks like gneisses (see Fig. 9.6). Table 9.4 shows a compilation of some data from the literature. 

TABLE 9.4 Thermal Properties of Igneous and Metamorphic Rocks (n Number of Samples)... 

Sedimentary rocks are characterized by a broad scatter of thermal properties within a single lithological type. This is originated mainly by the complex influence of mineral composition, texture and grain cementation, porosity, and pore fluids (Table 9.7). 

---