Simultaneous Measurement of Capillary Pressure and Dielectric Constant in Porous Media

Plug, Willem-Jan; Moreno, Luis Miguel Méndez; Bruining, J.; Slob, Evert

doi:10.2529/piers060907154242

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…At the lowest value of water saturation, the dielectric constant approaches the value of 2.5-3.5 for silica sand (Drnevich et al 2001). Results for dielectric constant show a comparable trend to that obtained by Plug et al (2007). The maximum percentage difference is 50% but, in their work, they used distilled water; the present work utilised the brine water which is commonly found in the saline Fig.…”

Section: Repeatability Of Experimentssupporting

confidence: 72%

“…Figure 2a, shows the reproducibility of results for σ b and ε b , respectively. As mentioned in previous study (Abidoye and Das 2015a), σ b has been found in several studies (Huang et al 2005;Plug et al 2007;Keller 1966) to be a function of water saturation. It is inferred that σ b increases with greater presence of water, because liquid water is a superior conductor of electricity than gaseous carbon dioxide.…”

Section: Repeatability Of Experimentssupporting

confidence: 67%

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Geoelectrical characterisation of CO2–water systems in porous media: application to carbon sequestration

et al. 2020

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Carbon sequestration is a promising method for the reduction of carbon dioxide (CO2) emissions as it permits the storage of compressed CO2 in the subsurface. The carbon sequestration sites must be monitored to detect potential leaks; one possible method involves the monitoring of geoelectrical properties such as electrical conductivity (σb) and dielectric constant (εb). This investigation focuses on using a time domain reflectometry (TDR) sensor to determine the influence of different factors on the measurements of the electrical conductivity (σb) and dielectric constant (εb) of a porous rock reservoir in relation to the soil water saturation (Sw). The factors investigated were presence of surfactant, salt concentration, pH and rock type which are unique to a given storage site. A number of dynamic two-phase flow experiments were performed using gaseous CO2. It was found that salt concentration, rock type and presence of a surfactant had a notable effect on the σb–Sw and εb–Sw relationships. Higher salt concentrations were found to give higher values for σb and εb for given Sw values. Limestone was found to result in the highest values of both σb and εb for any given Sw, followed by silica and basalt samples. The presence of a surfactant resulted in higher values for σb at higher Sw values and lower values for σb at lower Sw values compared to the case when no surfactant was present. Surfactant presence also resulted in lower values for εb at given Sw values. Initial pH values (with silica sand) were found to have no significant effect on the σb–Sw and εb–Sw relationships. The measurements of σb and εb indicate that the use of TDR presents a viable monitoring option. Furthermore, statistical analysis using non-linear regression was carried out on the experimental results and the model shows a good reliability in the prediction of the monitoring process in geological carbon sequestration.

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Section: Repeatability Of Experimentssupporting

confidence: 72%

Section: Repeatability Of Experimentssupporting

confidence: 67%

Geoelectrical characterisation of CO2–water systems in porous media: application to carbon sequestration

et al. 2020

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“…Electrical conductivity and dielectric permittivity have functional relationships with water saturation (Plug et al 2007;Abidoye et al 2014; Abidoye and Das 2015a) and these can be used in monitoring the quality of fluids in the reservoir.…”

Section: Electrical Conductivity and Dielectric Permittivitymentioning

confidence: 99%

Geo-electrical Characterisation for CO2 Sequestration in Porous Media

2017

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10Developing monitoring strategies for the detection and monitoring of possible CO 2 leakage or 11 migration from existing and anticipated storage media are important because they can provide 12 an early warning of unplanned CO 2 leakage from a storage site. While previous works have 13 concentrated on silicate and carbonate porous media, this work explores geoelectrical techniques 14 in basalt medium in a series of well-defined laboratory experiments. These were carried out to 15 identify the key factors which affect geoelectrical monitoring technique of CO 2 in porous media 16 using low cost and efficient time domain reflectometry (TDR). The system has been set up for 17 simultaneous measurement of the bulk electrical conductivity and bulk dielectric permittivity of 18 CO 2 -water-porous media system in silica sand, basalt and limestone. Factors investigated 19 include pH, pressure, temperature, salinity, salt type and the materials of the porous media. 20Results show that the bulk electrical conductivity and dielectric permittivity decrease as water 21 saturation decreases. Noticeably, electrical conductivity and permittivity decrease due to the

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“…For the measurements of the geoelectrical parameters in the water-saturated domain contaminated by CO 2 , time domain reflectometry (TDR) method was used [16], [25], [27].…”

Section: Time Domain Reflectometrymentioning

confidence: 99%

“…It is known that the bulk electrical parameters of the water-saturated porous media domain change with decrease in the saturation of the wetting phase (water) [16], [27]. But, in the case of CO 2 contamination of the water in porous media, static conditions are envisaged, where there is no noticeable change in the water saturation.…”

Section: Bulk Dielectric Constant Of the Water-saturated Domain In Thmentioning

confidence: 99%

pH, geoelectrical and membrane flux parameters for the monitoring of water-saturated silicate and carbonate porous media contaminated by CO2

Abidoye

Das

2015

Chemical Engineering Journal

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Additional Information:• NOTICE: this is the author's version of a work that was accepted for publication in Chemical Engineering Journal. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version will be subsequently pub- AbstractCharacteristics of potable water aquifer contaminated by CO 2 are investigated using welldefined laboratory experiments. The porous media domain was prepared with silica sand and limestone in separate experiments. The investigations used combinations of techniques to measure various parameters in the water-saturated porous media domain on which pressure of CO 2 was imposed, under various conditions, which correspond to different geological depths. Measured parameters included the pH, geoelectrical parameters, and the diffusion of the CO 2 gas through the water-saturated porous media domain using non-porous silicone rubber sheet. Experimental results revealed the existence of three stages in the profile of pH change with time as CO 2 dissolved and diffused in the water-saturated porous media domain, which was composed of silica sand. The first stage was characterised by rapid decline in the pH. This is associated with quick dissolution of CO 2 and the formation of carbonic acid together with bicarbonate. The second stage showed short rise in pH value, which was attributed to the reverse reaction, i.e., the formation of aqueous and gaseous CO 2 and water from the carbonic acid. The third stage was that of the equilibrium in the forward and the reverse reactions, marked by steady state in pH value, which remained unchanged till the end of the experiment. The bulk electrical conductivity (σ b ) of the water-saturated porous domain increased in the presence of CO 2 . This is attributed to the formation of ionic species, especially bicarbonate, as CO 2 dissolved in the domain. The rise in σ b coincided with the first stage of the change in the pH of the system. In addition, the σ b was higher in limestone than silica sand, and it increased with pressure of the domain. But, the bulk dielectric constant (ε b ) showed no change with the dissolution of the CO 2 under different conditions. Furthermore, permeation of CO 2 through the silicone rubber indicated the diffusion of the CO 2 gas through the water-saturated domain. CO 2 flux through the membrane was shown to increase with depth or pressure of the domain. A mathematical

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Simultaneous Measurement of Capillary Pressure and Dielectric Constant in Porous Media

Cited by 6 publications

References 12 publications

Geoelectrical characterisation of CO2–water systems in porous media: application to carbon sequestration

Geoelectrical characterisation of CO2–water systems in porous media: application to carbon sequestration

Geo-electrical Characterisation for CO2 Sequestration in Porous Media

pH, geoelectrical and membrane flux parameters for the monitoring of water-saturated silicate and carbonate porous media contaminated by CO2

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