Impurity Effects on the Mechanical Properties and Permeability Characteristics of Salt Rock

Zhang, Qiangxing; Liu, Jianfeng; Wang, Lu; Luo, Maokang; Liu, Hejuan; Zou, Hui

doi:10.3390/en13061366

Cited by 28 publications

(13 citation statements)

References 44 publications

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“…However, torsional deformation experiments on halite‐calcite mixtures demonstrated that the strength of the two‐phase mixtures was higher than pure halite, and that the calcite grains hindered halite plastic flow and stress relaxation (Marques et al, 2010). Moreover, another study on the mechanical properties and gas permeability of rock salt showed that the impurity content results in an increase of the rock salt strength, and a higher permeability (Zhang, Liu, et al, 2020).…”

Section: Impact Of Geochemical and Microstructural Characteristics On...mentioning

confidence: 99%

Mineralogy, microstructures and geomechanics of rock salt for underground gas storage

Vandeginste

Buysschaert

et al. 2023

Deep Underground Science and Engineering

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Rock salt has excellent properties for its use as underground leak‐proof containers for the storage of renewable energy. Salt solution mining has long been used for salt mining, and can now be employed in the construction of underground salt caverns for the storage of hydrogen gas. This paper presents a wide range of methods to study the mineralogy, geochemistry, microstructure and geomechanical characteristics of rock salt, which are important in the engineering of safe underground storage rock salt caverns. The mineralogical composition of rock salt varies and is linked to its depositional environment and diagenetic alterations. The microstructure in rock salt is related to cataclastic deformation, diffusive mass transfer and intracrystalline plastic deformation, which can then be associated with the macrostructural geomechanical behavior. Compared to other types of rock, rock salt exhibits creep at lower temperatures. This behavior can be divided into three phases based on the changes in strain with time. However, at very low effective confining pressure and high deviatoric stress, rock salt can exhibit dilatant behavior, where brittle deformation could compromise the safety of underground gas storage in rock salt caverns. The proposed review presents the impact of purity, geochemistry and water content of rock salt on its geomechanical behavior, and thus, on the safety of the caverns.

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Section: Impact Of Geochemical and Microstructural Characteristics On...mentioning

confidence: 99%

Mineralogy, microstructures and geomechanics of rock salt for underground gas storage

Vandeginste

Buysschaert

et al. 2023

Deep Underground Science and Engineering

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“…In recent years, the permeability problems of various engineering rocks have been experimentally studied by many scholars. Because the stress of rocks in deep underground engineering is frequently a dynamic load that changes over time, based on triaxial compression tests and triaxial cyclic loading tests, scholars have performed a lot of research on various types of rocks in terms of permeability characteristics, and obtained the deformation, strength, and permeability evolution laws of different rocks [9][10][11][12][13][14][15]. By analyzing the seepage-stress coupling mechanism of sandstone under different confining pressures, the variation law of permeability with a stress-strain curve was obtained, finding that permeability is a function of axial stress and strain [16][17][18][19], and the permeability in different deformation stages of sandstone shows different characteristics [20].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Permeability and Damage Characteristics of Limestone under Stress–Seepage Coupling Conditions

Wang,

Liu,

Liao

et al. 2023

Energies

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With the increase in energy demand, energy engineering has gradually developed to go deeper, accompanied by a complex geological environment, such as the coupling of stress and seepage. Limestone is widely found in underground rock engineering, and its stress–seepage coupling characteristics have a great influence on the safety and stability of related engineering projects. In order to study the permeability characteristics and damage evolution of limestone during the deformation and failure process under stress–seepage coupling conditions, permeability and acoustic emission tests on limestone were performed in this paper. The results showed that: the stress–strain curve demonstrated periodicity, as did the permeability change. The change in permeability in different deformation stages of axial strain and lateral strain was similar, but it was more appropriate to reflect the permeability evolution in terms of lateral strain. The permeability of the limestone slightly decreased in the volumetric compression stage, and tended to saturate after a sudden increase in the expansion stage. The presence of the confining pressure reduced the permeability of the rock. In the process of limestone deformation and failure, the level of acoustic emission activity can reflect the degree of fracture development. The permeability characteristics and acoustic emission characteristics had a good corresponding relationship. The greater the confining pressure, the higher the acoustic emission activity. The deformation and damage process of limestone experienced three stages: damage stable growth, damage acceleration development, and damage saturation.

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“…Amalia et al [35] simulated CO 2 injection into sandstone and explored relative permeability characteristics for CO 2 in sandstone under normal temperature and overburden pressure. Zhang et al [36] held that the permeability of salt rock with different components rose with the increase in pore pressure and was affected by the Klinkenberg effect. Al-Khdheeawi et al [37,38] studied the effects of rock properties on geochemical reactivity and CO 2 storage efficiency and the effects of CO 2 injection on permeability.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Relative Permeability Characteristics for CO2 in Sandstone under High Temperature and Overburden Pressure

et al. 2021

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In this study, CO2 seepage of sandstone samples from the Taiyuan-Shanxi Formation coal seam roof in Ordos Basin, China, under temperature-stress coupling was studied with the aid of the TAWD-2000 coal rock mechanics-seepage test system. Furthermore, the evolution law and influencing factors on permeability for CO2 in sandstone samples with temperature and axial pressure were systematically analyzed. The results disclose that the permeability of sandstone decreases with the increase in stress. The lower the stress is, the more sensitive the permeability is to stress variation. High stress results in a decrease in permeability, and when the sample is about to fail, the permeability surges. The permeability of sandstone falls first and then rises with the rise of temperature, which is caused by the coupling among the thermal expansion of sandstone, the desorption of CO2, and the evaporation of residual water in fractures. Finally, a quadratic function mathematical model with a fitting degree of 98.2% was constructed between the temperature-stress coupling effect and the permeability for CO2 in sandstone. The model provides necessary data support for subsequent numerical calculation and practical engineering application. The experimental study on the permeability characteristics for CO2 in sandstone under high temperature and overburden pressure is crucial for evaluating the storage potential and predicting the CO2 migration evolution in underground coal gasification coupling CO2 storage projects.

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Impurity Effects on the Mechanical Properties and Permeability Characteristics of Salt Rock

Cited by 28 publications

References 44 publications

Mineralogy, microstructures and geomechanics of rock salt for underground gas storage

Mineralogy, microstructures and geomechanics of rock salt for underground gas storage

A Study on the Permeability and Damage Characteristics of Limestone under Stress–Seepage Coupling Conditions

Experimental Study on Relative Permeability Characteristics for CO2 in Sandstone under High Temperature and Overburden Pressure

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