Journal ArticleDOI
Velocity and resistivity changes during freeze-thaw cycles in Berea sandstone
Carl H. Sondergeld,Chandra Rai +1 more
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In this paper, simultaneous measurements of resistivity, compressional (Vp ), and shear ( Vs ) velocities were made during the temperature cycling of Berea sandstone while at elevated pressure.Abstract:
We report on simultaneous measurements of resistivity, compressional ( Vp ) , and shear ( Vs ) velocities made during the temperature cycling of Berea sandstone while at elevated pressure. Temperatures were cycled through the freezing point of the saturating brine. The responses of resistivity and velocities are in phase but are asymmetrical as the brine freezes and thaws. Limited freezing causes no discernible damage to the core. Free water is present below the nominal freezing point of the brine. Vp , Vs , and resistivity change by 16%, 24%, and 500%, respectively, over the temperature range of −4°C to +6°C at 6.9 MPa confining pressure.read more
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An NMR-based investigation of pore water freezing process in sandstone
TL;DR: In this paper, a low-field nuclear magnetic resonance method aided by high-resolution temperature measurements was employed to investigate the pore water freezing process of in sandstone, and the results indicated that porewater in fully-saturated sandstone consists of bound water, capillary water, and bulk water.
Journal ArticleDOI
Coupled effects of chemical environments and freeze–thaw cycles on damage characteristics of red sandstone
TL;DR: In this article, the influence of freeze-thaw cycles under complex chemical environments on the red sandstone, nuclear magnetic resonance (NMR) technology was used to analyze the damage evolution law of Red sandstone.
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P-wave velocity changes in freezing hard low-porosity rocks: a laboratory-based time-average model
TL;DR: In this article, a modified version of the Timur's two-phase equation was used to measure p-wave velocities of 22 decimetre-large low-porosity (100 micro-fissures) bedrock.
Journal ArticleDOI
Damage evolution mechanism and constitutive model of freeze- thaw yellow sandstone in acidic environment
TL;DR: In this paper, the damage evolution equation of chemical freeze-thaw sandstone under load is established, and the damage correction coefficient is introduced to modify the total damage of chemical frozen-thawed sandstone.
Journal ArticleDOI
Investigation of pore structure changes in Mesozoic water-rich sandstone induced by freeze-thaw process under different confining pressures using digital rock technology
TL;DR: Wang et al. as mentioned in this paper studied the micro-scale pore structure changes during freeze-thaw process using three-dimensional digital rock technology, and observed that with the increase of confining pressure, the damage of Mesozoic water-rich sandstone increases, e.g., the porosity increases by 4.05, 5.87, 7.02% and 9.09%.
References
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Journal ArticleDOI
Elastic moduli of a cracked solid
TL;DR: In this paper, a self-consistent method for the elastic moduli of bodies containing randomly distributed flat cracks, with or without fluid in their interiors, is proposed and general concepts are outlined for arbitrary cracks and explicit derivations together with numerical results are given.
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Velocity and attenuation of seismic waves in two-phase media; Part I, Theoretical formulations
Guy T. Kuster,M. Nafi Toksöz +1 more
TL;DR: In this article, the elastic moduli of the composite medium were derived for both solid and liquid inclusions in a solid matrix as well as for solid suspensions in a fluid matrix.
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Viscoelastic properties of fluid-saturated cracked solids
TL;DR: The effective elastic moduli of a fluid-saturated solid containing thin cracks depend on the degree of interconnection between the cracks as mentioned in this paper, which can be estimated from the crack geometry or permeability.
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Formation of natural gas hydrates in marine sediments 1. Conceptual model of gas hydrate growth conditioned by host sediment properties
TL;DR: In this paper, the authors assume that gas hydrate behaves in a way analogous to ice in a freezing soil, and they predict that gas hydrates in a sequence of fine-grained sediments are inhibited by reduced pore water activity in the vicinity of hydrophilic mineral surfaces, and the excess internal energy of small crystals confined in pores.