Thermal expansion of rocks: some measurements at high pressure

Wong, Teng-fong; Brace, W. F.

doi:10.1016/0040-1951(79)90143-4

Cited by 123 publications

(40 citation statements)

References 40 publications

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“…A literature survey shows that there are very few experimental results on the dependence of the drained thermal expansion to compaction or porosity changes. The experimental results of Wong and Brace [4] show the reduction of the thermal expansion coefficients of very low porosity rocks with confining pressure increase. Considering the limited number of experimental results in the literature, the dependence of thermal expansion on the porosity can be evaluated indirectly by using the temperature dependency of drained compressibility for which more experimental results are available.…”

Section: Effect Of Porosity On Thermal Expansion Coefficientmentioning

confidence: 97%

Effect of porosity on the thermal expansion coefficient: A discussion of the paper ‘Effects of mineral admixtures on the thermal expansion properties of hardened cement paste’ by Z.H. Shui, R. Zhang, W. Chen, D. Xuan, Constr. Build. Mater. 24 (9) (2010) 1761–1767

Ghabezloo¹

2010

Construction and Building Materials

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Section: Effect Of Porosity On Thermal Expansion Coefficientmentioning

confidence: 97%

Effect of porosity on the thermal expansion coefficient: A discussion of the paper ‘Effects of mineral admixtures on the thermal expansion properties of hardened cement paste’ by Z.H. Shui, R. Zhang, W. Chen, D. Xuan, Constr. Build. Mater. 24 (9) (2010) 1761–1767

Ghabezloo¹

2010

Construction and Building Materials

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“…Application of Equation (8) suggests that the model can only contain three sets of orthogonal cracks align with the principal stress. Cracks in rock have been observed to be rarely in random orientations and this is primarily the result of non-uniform temperature and/or non-hydrostatic stress conditions [36][37][38].…”

Section: General Comment On Rock Physics Modelsmentioning

confidence: 99%

Exploring Trends in Microcrack Properties of Sedimentary Rocks: An Audit of Dry and Water Saturated Sandstone Core Velocity–Stress Measurements

Angus

Fisher²,

Verdon³

2012

IJG

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Stress dependent rock physics models are being used more routinely to link mechanical deformation and stress perturbations to changes in seismic velocities and seismic anisotropy. In this paper, we invert for the effective non-linear microstructural parameters of 69 dry and saturated sandstone core samples. We evaluate the results in terms of the model input parameters of two non-linear rock physics models: A discrete and an analytic microstructural stress-dependent formulation. The results for the analytic model suggest that the global trend of the initial crack density is lower and initial aspect ratio is larger for the saturated samples compared to the corresponding dry samples. The initial aspect ratios for both the dry and saturated samples are tightly clustered between 0.0002 and 0.001, whereas the initial crack densities show more scatter. The results for the discrete model show higher crack densities for the saturated samples when compared to the corresponding dry samples. With increasing confining stress the crack densities decreases to almost identical values for both the dry and saturated samples. A key result of this paper is that there appears to be a stress dependence of the compliance ratio N T B B within many of the samples, possibly related to changing microcrack geometry with increasing confining stress. Furthermore, although the compliance ratio N T B B for dry samples shows a diffuse distribution between 0.4 and 2.0, for saturated samples the distribution is very tightly clustered around 0.5. As confining stresses increase the compliance ratio distributions for the dry and saturated samples become more diffuse but still noticeably different. This result is significant because it reaffirms previous observations that the compliance ratio can be used as an indicator of fluid content within cracks and fractures. From a practical perspective, an overarching purpose of this paper is to investigate the range of input parameters of the microstructural models under both dry and saturated conditions to improve prediction of stress dependent seismic velocity and anisotropy observed in time-lapse seismic data due to hydro-mechanical effects related to fluid production and injection.

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“…Typical values for the thermal expansion coefficient for saturated rock at high temperature and pressure range from 5 Â 10 À6°CÀ1 to 1.5 Â 10 À5°CÀ1 [Bauer and Handin, 1983;Heard and Page, 1982;Wong and Brace, 1979], and we use a value of 1 Â 10 À5°CÀ1 in all simulations. Crustal deformation scales inversely with shear (rigidity) modulus, and laboratory experiments at high pressures and temperatures indicate that the intrinsic shear modulus of crystalline rocks varies from 0.2 to 50 GPa depending on rock type, temperature, pressure, and porosity [Heard and Page, 1982].…”

Section: à2mentioning

confidence: 99%

Numerical models of caldera deformation: Effects of multiphase and multicomponent hydrothermal fluid flow

et al. 2009

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[1] Ground surface displacement (GSD) in large calderas is often interpreted as resulting from magma intrusion at depth. Recent advances in geodetic measurements of GSD, notably interferometric synthetic aperture radar, reveal complex and multifaceted deformation patterns that often require complex source models to explain the observed GSD. Although hydrothermal fluids have been discussed as a possible deformation agent, very few quantitative studies addressing the effects of multiphase flow on crustal mechanics have been attempted. Recent increases in the power and availability of computing resources allow robust quantitative assessment of the complex time-variant thermal interplay between aqueous fluid flow and crustal deformation. We carry out numerical simulations of multiphase (liquid-gas), multicomponent (H 2 O-CO 2 ) hydrothermal fluid flow and poroelastic deformation using a range of realistic physical parameters and processes. Hydrothermal fluid injection, circulation, and gas formation can generate complex, temporally and spatially varying patterns of GSD, with deformation rates, magnitudes, and geometries (including subsidence) similar to those observed in several large calderas. The potential for both rapid and gradual deformation resulting from magma-derived fluids suggests that hydrothermal fluid circulation may help explain deformation episodes at calderas that have not culminated in magmatic eruption.

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Thermal expansion of rocks: some measurements at high pressure

Cited by 123 publications

References 40 publications

Effect of porosity on the thermal expansion coefficient: A discussion of the paper ‘Effects of mineral admixtures on the thermal expansion properties of hardened cement paste’ by Z.H. Shui, R. Zhang, W. Chen, D. Xuan, Constr. Build. Mater. 24 (9) (2010) 1761–1767

Effect of porosity on the thermal expansion coefficient: A discussion of the paper ‘Effects of mineral admixtures on the thermal expansion properties of hardened cement paste’ by Z.H. Shui, R. Zhang, W. Chen, D. Xuan, Constr. Build. Mater. 24 (9) (2010) 1761–1767

Exploring Trends in Microcrack Properties of Sedimentary Rocks: An Audit of Dry and Water Saturated Sandstone Core Velocity–Stress Measurements

Numerical models of caldera deformation: Effects of multiphase and multicomponent hydrothermal fluid flow

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