Investigating the damage evolution of sandstone using electrical impedance spectroscopy

Yin, Duohao; Xu, Qinqin

doi:10.1016/j.ijrmms.2021.104817

Cited by 21 publications

(5 citation statements)

References 39 publications

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“…The contact resistance between the core sample and the measurement electrodes was present, so the Cole equivalent circuit model was used for electrochemical evaluation of the system [15]. The fitting results obtained using Zview2 software and the variation of each electrical component in the circuit with CO 2 saturation are shown in Figure 9, and the fitting error of each component in the equivalent circuit is less than 10%.…”

Section: Equivalent Circuit Fittingmentioning

confidence: 99%

Impedance Characteristics of Berea Sandstone Cores in the Process of CO2 Injection Displacement with Saturated Brine

Xue,

Xu,

Liu

2024

JENR

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As an important means of CO2 geological storage leakage monitoring, resistivity monitoring technology is of great significance to the safety and stability of CCUS project. In order to study the electrical signal response rule of the evolution of CO2 saturation in the reservoir, a joint core displacement experiment system of electrochemical impedance analysis and microfocus X-ray CT was designed and constructed to simulate the process of CO2 displacement of brine in Berea sandstone cores under stratigraphic temperature and pressure conditions. The electrochemical impedance characteristics of the core-fluid system are analyzed by electrochemical impedance spectroscopy. The experimental results show that at lower temperature and pressure, it is more difficult for CO2 to invade the pore space occupied by the brine in situ, resulting in drastic changes in CO2 plane saturation along the displacement direction. With the increase of temperature and pressure, the CO2 saturation curve becomes smoother and the migration and displacement front becomes even. The Cole equivalent circuit model is used to describe the conduction mode of AC electrical signals inside the core, and the electrochemical impedance characteristic analysis focusing on the high frequency region shows that the system impedance increases with the increase of CO2 saturation, and decreases with the increase of scanning frequency. In addition, the changes of impedance characteristics in the electrochemical impedance spectroscopy not only reflect the pore structure characteristics of the core, but also reveal the evolution law of CO2 saturation in the porous medium. With the increase of CO2 saturation, the low pore space is gradually occupied by CO2, and the residual brine connectivity of the pore space as a conductive component decreases. The decrease of the internal conductive circuit leads to the rapid increase of the impedance, which is consistent with the change of resistance and capacitance when fitting the Cole equivalent circuit model.

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Section: Equivalent Circuit Fittingmentioning

confidence: 99%

Impedance Characteristics of Berea Sandstone Cores in the Process of CO2 Injection Displacement with Saturated Brine

Xue,

Xu,

Liu

2024

JENR

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“…Amongst various NDT techniques employed for rock damage characterisation, acoustic emissions (AE) (Chang and Lee 2004;Kim et al 2015;Li and Einstein 2017;Li et al 2019;Wu et al 2021), ultrasonic testing (Modiriasari et al 2017;Shirole et al 2020a;Wu et al 2023), electrical impedance spectroscopy (EIS) (Saltas et al 2014;Yin and Xu 1997), digital image correlation (DIC) (Shirole et al 2020b), high-speed photography (Serati et al 2012(Serati et al , 2014, and computed tomography (CT) scanning (Shuai et al 1997) are widely adopted. Ultrasonic testing is a dynamic NDT method that utilises various transducer and receiver configurations to propagate ultrasonic stress waves into the material under examination.…”

Section: Introductionmentioning

confidence: 99%

Determining rock crack stress thresholds using ultrasonic through-transmission measurements

He,

Serati,

Veidt

et al. 2024

Int J Coal Sci Technol

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The crack initiation stress threshold is widely used in excavation industries as rock spalling strength when designing deep underground structures to avoid unwanted brittle failures. While various strain-based methods have been developed for the estimation of this critical design parameter, such methods are destructive and often requires subjective interpretations of the stress–strain curves, particularly in rocks with pre-existing microcracks or high porosity. This study explore the applicability of non-destructive ultrasonic through-transmission methods for determining rock damage levels by assessing the changes in transmitted signal characteristics during loading. The change in velocity, amplitude, dominant frequency, and root-mean-square voltage are investigated with four different rock types including marble, sandstone, granite, and basalt under various stress levels. Results suggest the rate of signal variations can be reliably used to estimate crack closure and crack initiation stress levels across the tested rocks before failure. Comparison of the results between the conventional techniques and the new proposed methods based on ultrasonic monitoring are further discussed.

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“…By measuring the resistivity of rocks, important information such as water saturation (Jiang et al, 2021), porosity (Whitman and Yeboah-Forson, 2015), permeability (Kirkby and Heinson, 2017), rock type and composition (Rekapalli et al, 2015;Senger et al, 2021;Bai et al, 2022a) can be determined. Since Archie first proposed the empirical relationship between rock resistivity, porosity, and water saturation (Archie, 1942), scholars have studied the resistivity changes of rocks on this basis and found that the development of fractures (Yin and Xu, 2021), pressure (Wang et al, 2014), saturation (Yang et al, 2022), and frequency (Zhou and Che, 2021) of rocks affect resistivity changes. The frequency of rock fractures significantly affects the variation of resistivity with water saturation which can be used for fracture detection and evaluation (Lee et al, 2021;Liu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…As sandstones are one of the most common rock formations (Yin et al, 2021), it is essential to study the changes in resistivity to investigate the geological structure and solve related geological problems. Previous studies have focused on the influence of fractures (Park et al, 2017), pressure (Amalokwu and Falcon-Suarez, 2021;Zheng et al, 2023), temperature (Zhang et al, 2016;Liu et al, 2020;Yuan et al, 2022), and rock type (Wu et al, 2023) on rock resistivity.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of saturation on the resistivity response of sandstone

He,

Zheng,

et al. 2024

Front. Earth Sci.

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Studying the changes in electrical resistivity of sandstones under various frequencies and saturation levels is important for addressing many geological problems through electrical prospecting. In this study, we investigated the effect of different frequencies (500 Hz–200 kHz) and saturation levels (0%–100%) on the resistivity of sandstone in the Ordos region. Our research indicates that when the saturation level is low (<40%), the resistivity of the sandstone decreases rapidly. With the increase of saturation level, pore water gradually becomes another major factor affecting resistivity in addition to induced polarization effect. When the saturation level is high (>80%), the resistivity tends to stabilize. Additionally, the resistivity of sandstone decreases with the increase of saturation. Furthermore, with an increase in frequency, the rate of reduction in resistivity gradually slows down, and the resistivity of sandstone decreases under the influence of saturation. This study provides a valuable reference for the practical application of sandstone resistivity in geological prospecting.

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Investigating the damage evolution of sandstone using electrical impedance spectroscopy

Cited by 21 publications

References 39 publications

Impedance Characteristics of Berea Sandstone Cores in the Process of CO<sub>2</sub> Injection Displacement with Saturated Brine

Impedance Characteristics of Berea Sandstone Cores in the Process of CO<sub>2</sub> Injection Displacement with Saturated Brine

Determining rock crack stress thresholds using ultrasonic through-transmission measurements

Experimental study of the influence of saturation on the resistivity response of sandstone

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Investigating the damage evolution of sandstone using electrical impedance spectroscopy

Cited by 21 publications

References 39 publications

Impedance Characteristics of Berea Sandstone Cores in the Process of CO&lt;sub&gt;2&lt;/sub&gt; Injection Displacement with Saturated Brine

Impedance Characteristics of Berea Sandstone Cores in the Process of CO&lt;sub&gt;2&lt;/sub&gt; Injection Displacement with Saturated Brine

Determining rock crack stress thresholds using ultrasonic through-transmission measurements

Experimental study of the influence of saturation on the resistivity response of sandstone

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Impedance Characteristics of Berea Sandstone Cores in the Process of CO<sub>2</sub> Injection Displacement with Saturated Brine

Impedance Characteristics of Berea Sandstone Cores in the Process of CO<sub>2</sub> Injection Displacement with Saturated Brine