Thermal conductivity of rock-forming minerals

Hôrai, Ki-iti; Simmons, Gene

doi:10.1016/0012-821x(69)90186-1

Cited by 201 publications

(89 citation statements)

References 8 publications

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“…Properties determined by Horai & Simmons (1969), as well as the density of these samples are given in Table 1. The chemical composition of each sample was determined with a microprobe and these analyses along with that of the synthetic spinel are given in Table 2.…”

Section: Methodsmentioning

confidence: 99%

Thermal expansion of natural spinel, ferroan gahnite, magnesiochromite and synthetic spinel

Singh¹,

Simmons²,

McFarlin³

1975

Acta Cryst Sect A

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The lattice parameters of natural spinel, ferroan gahnite, magnesiochromite, and synthetic spinel at elevated temperatures have been determined. The results are: spinel at = 8.0870 + 35.24 x 10-6t+ 45.73 x 10-gt 2, 22 < t< 840°C; ferroan gahnite at = 8.1050+ 54.35 x 10-6t+ 10.53 x 10-9t 2, 22< t< 845°C; magnesiochromite at = 8.2965 + 56"82 x 10-6t+ 8"08 x 10-9t 2, 22 < t < 823 °C, synthetic spinel at = 8.0821 +45.79 x 10-6t+35.69 x 10-9t 2, 26< t< 800°C, where at is the lattice parameter in ~ at t°C. Expressions for thermal expansions are derived. The replacement of magnesium cations by zinc and iron and of A1203 by Cr203 in spinel decreases the mean thermal expansion in the range of temperatures covered, but increases the lattice parameters.

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Section: Methodsmentioning

confidence: 99%

Thermal expansion of natural spinel, ferroan gahnite, magnesiochromite and synthetic spinel

Singh¹,

Simmons²,

McFarlin³

1975

Acta Cryst Sect A

Self Cite

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“…As shown in Table 2, the 6B-22R sample contained a considerable fraction of non-quartz minerals (~36%), such as albite, feldspar, illite, and muscovite, whereas 5B-22H mostly consisted of quartz-dominant silicate sand with some calcareous fragments. Over the range of water saturation, as can be seen in Figure 11a, the thermal conductivity of 6B-22R was consistently lower than that of 5B-22H because of the higher non-quartz fraction in 6B-22R, as quartz is known to have higher thermal conductivity value (e.g., ~6-8 W•m −1 •K −1 ) than other minerals [55]. The results confirm that the measured thermal conductivity of 5B-22H at Sw = 100% is within a similar range to that of the same sediment sample containing methane hydrate under a brine-saturated condition (i.e., 1.47 W•m −1 •K −1 [9]) due to the similar thermal conductivity of water and methane hydrate.…”

Section: Variations In Thermal Conductivity and Electrical Resistancementioning

confidence: 85%

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

et al. 2016

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This study investigates the geomechanical, hydraulic and thermal characteristics of natural sandy sediments collected during the Ulleung Basin gas hydrate expedition 2, East Sea, offshore Korea. The studied sediment formation is considered as a potential target reservoir for natural gas production. The sediments contained silt, clay and sand fractions of 21%, 1.3% and 77.7%, respectively, as well as diatomaceous minerals with internal pores. The peak friction angle and critical state (or residual state) friction angle under drained conditions were~26 • and~22 • , respectively. There was minimal or no apparent cohesion intercept. Stress-and strain-dependent elastic moduli, such as tangential modulus and secant modulus, were identified. The sediment stiffness increased with increasing confining stress, but degraded with increasing strain regime. Variations in water permeability with water saturation were obtained by fitting experimental matric suction-water saturation data to the Maulem-van Genuchen model. A significant reduction in thermal conductivity (from~1.4-1.6 to~0.5-0.7 W·m −1 ·K −1 ) was observed when water saturation decreased from 100% to~10%-20%. In addition, the electrical resistance increased quasi-linearly with decreasing water saturation. The geomechanical, hydraulic and thermal properties of the hydrate-free sediments reported herein can be used as the baseline when predicting properties and behavior of the sediments containing hydrates, and when the hydrates dissociate during gas production. The variations in thermal and hydraulic properties with changing water and gas saturation can be used to assess gas production rates from hydrate-bearing deposits. In addition, while depressurization of hydrate-bearing sediments inevitably causes deformation of sediments under drained conditions, the obtained strength and stiffness properties and stress-strain responses of the sedimentary formation under drained loading conditions can be effectively used to assess sediment responses to depressurization to ensure safe gas production operations in this potential target reservoir.

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“…Under ambient conditions, the thermal conductivity values of calciumrich plagioclase feldspars, pyroxene, olivine, and amphibole are 1.68, 4.41, 4.83, and 3.65 W · m −1 · K −1 , respectively [30]. Thus, by using Eq.…”

Section: Thermal Transport Propertiesmentioning

confidence: 97%

“…From thin sections of the specimens, it is found that on the average, these samples consist of 69% calcium-rich plagioclase feldspars, 20% pyroxene, 6% olivine, and 5% amphibole by volume. Their densities are 2.769, 3.209, 3.469, and 3.059 g · cm −3 , respectively [30]. Thus, the density of the solid phase, true density, or grain density (ρ s ) was calculated for each sample by using [31] …”

Section: Density-related Propertiesmentioning

confidence: 99%

Modeling of the Effective Thermal Conductivity of Consolidated Porous Media with Different Saturants: A Test Case of Gabbro Rocks

Aurangzeb

Maqsood

2007

Int J Thermophys

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The thermal conductivity and thermal diffusivity of porous consolidated gabbro rocks have been measured simultaneously by the transient plane source technique at normal temperature and pressure using air and water as saturants. The density and porosity are measured using American Society for Testing and Materials (ASTM) standards under ambient conditions. The mineral composition is obtained using a petrography technique. Data are presented for 12 specimens of gabbro, taken from Warsik near Peshawar, Pakistan. A recently proposed empirical model for the prediction of the thermal conductivity of porous consolidated igneous rocks is established using different fluids in pore spaces, under ambient conditions. An exponential decay formula is also proposed for the prediction of the thermal conductivity at room temperature and normal pressure. The results are compared with different existing empirical models. A simple correlation between density and porosity is also reported.

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Thermal conductivity of rock-forming minerals

Cited by 201 publications

References 8 publications

Thermal expansion of natural spinel, ferroan gahnite, magnesiochromite and synthetic spinel

Thermal expansion of natural spinel, ferroan gahnite, magnesiochromite and synthetic spinel

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

Modeling of the Effective Thermal Conductivity of Consolidated Porous Media with Different Saturants: A Test Case of Gabbro Rocks

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