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Physico-chemical and dielectric parameters for the monitoring of carbon sequestration in basalt and silica media

journal contribution
posted on 16.07.2020 by KO Rabiu, LK Abidoye, Diganta Das
Currently, there are concerns about the safety of carbon sequestration in the geological media. To assuage this concern, scientists and engineers have the tasks to demonstrate fool-proof and comprehensive techniques that can monitor the movement, or otherwise, concentration of the injected CO2 in the subsurface. In this work, well-defined laboratory experiments were used to demonstrate the key physico-chemical characteristics and dielectric parameters that are useful in monitoring carbon sequestration sites. The porous materials used were basalt and silica sand samples to demonstrate the possibility of CO2 injection into different media. To simulate the resident fluids, distilled and brine water samples were used in separate experimentations. Also, the pressures and temperatures were chosen to correspond to different geological depths which are relevant for CO2 injection. The pH, bulk electrical conductivity (σୠ) and bulk dielectric permittivity (εୠ) of the system were measured for the two different media. Onne hand, the decrease in pH was clearly observed in both the basalt and silica sand after the exposure to CO2. On the other hand, σୠ and εୠ increased as CO2 was injected. Our results further revealed a higher ion mobilization potential in basalt medium than that in silica sand. This results in lower pH and higher electrical conductivity in the basalt medium than the silica medium. Thus, a simultaneous measurement of pH, σୠ and εୠ are proposed as a multiparameter approach to monitor CO2 leakage from the storage reservoir. As far as we are aware, this is the first work in the open literature that reports simultaneous dielectric and electrical behaviours of CO2-water-porous media system for basalt porous medium in connection with carbon sequestration.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Environmental Technology & Innovation

Volume

20

Issue

November 2020

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier B.V.

Publisher statement

This paper was accepted for publication in the journal Environmental Technology & Innovation and the definitive published version is available at https://doi.org/10.1016/j.eti.2020.101052.

Acceptance date

14/07/2020

Publication date

2020-07-18

Copyright date

2020

ISSN

2352-1864

Language

en

Depositor

Dr Diganta Das. Deposit date: 14 July 2020

Article number

101052

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