Publication

Sealing Response of Pre-Fissured Opalinus Clay to CO₂ Injection

Lyesse Laloui, Eleni Stavropoulou
2025

Abstract

Fissures can have a significant impact on caprock integrity in the context of carbon capture and storage (CCS). In this campaign, the sealing capacity of a pre-fissured caprock material, the Opalinus Clay shale, is studied with real time x-ray imaging during CO2 injection. 3D image analysis of the acquired x-ray tomographies reveals that the pre-existing fissure drives the hydromechanical response of the material until a certain overpressure level after which, new breakthrough pathways are created though the matrix of the material.

Official source

https://infoscience.epfl.ch/entities/publication/2e1561ae-53ec-4a3f-aca4-1ccd397972de

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Lyesse Laloui, Eleni Stavropoulou
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2e1561ae-53ec-4a3f-aca4-1ccd397972de

About this result

Related concepts (30)

X-ray

X-ray radiation, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 nanometers to 10 picometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3e16Hz to 3e19Hz) and energies in the range 124 keV to 145 eV, respectively. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays.

Radiography

Radiography is an imaging technique using X-rays, gamma rays, or similar ionizing radiation and non-ionizing radiation to view the internal form of an object. Applications of radiography include medical radiography ("diagnostic" and "therapeutic") and industrial radiography. Similar techniques are used in airport security (where "body scanners" generally use backscatter X-ray). To create an image in conventional radiography, a beam of X-rays is produced by an X-ray generator and is projected toward the object.

Carbon capture and storage

Carbon capture and storage (CCS) is a process in which a relatively pure stream of carbon dioxide (CO2) from industrial sources is separated, treated and transported to a long-term storage location. For example, the carbon dioxide stream that is to be captured can result from burning fossil fuels or biomass. Usually the CO2 is captured from large point sources, such as a chemical plant or biomass plant, and then stored in an underground geological formation. The aim is to reduce greenhouse gas emissions and thus mitigate climate change.