Boone, Marijn

Cnudde, Veerle

Ferket, Helga

Quaghebeur, Mieke

English

Ghent University Academic Bibliography

Geophysical Research AbstractsVol. 13, EGU2011-10868, 2011EGU General Assembly 2011© Author(s) 2011Quantifying chemical and petrophysical alterations in porous materials byCO$_{2}$ using HRXCTMarijn Boone (1,2), Veerle Cnudde (1), Mieke Quaghebeur (2), and Helga Ferket (2)(1) Ghent University, Faculty of Sciences, Department of Geology and soil science, Gent, Belgium (marijn.boone@ugent.be),(2) VITO, Flemish Institute for Technological Research, Unit conversion and separation technology, Boeretang 200, 2400Mol, BelgiumGeological sequestration of CO2 is a transitional solution to reduce the concentration of greenhouse gases in theatmosphere pending sufficient renewable energy alternatives. CO2 can also be used as raw product for industrialprocesses whereby CO2 is sequesterd and new materials are formed. Carbonation can be used to stabilize mineralwaste or even be transformed into innovative materials. Understanding the mineral-CO2 interactions is essential inthe advances of the carbonation process and the upscaling of geological storage. Accurately translating chemicaldata from reactor experiments and petrophysical data of reservoir rocks to a model for reactive transport is often achallenging step. This is mainly due to the complexity of the used reservoir rocks in the experiments, resulting ina model that cannot be univocally calibrated or even validated.This research starts from a clear, verifiable design, in order to unravel the processes that occur when a CO2-enrichedfluid reacts with different mineral phases in porous media. To comprehend the chemical properties and the kinet-ics of the reactions, individual minerals are exposed to a CO2-enriched fluid in batch reactors. To analyze thephysico-chemical changes (the “diagenesis” of the rock), artificial porous rocks are created from these individualminerals with controllable petrophysical parameters (for example: porosity, permeability, reactive surface, com-position) using 3D fiber deposition or other techniques. By using 3D fiber deposition, a homogenous rectangularstructure is made, which is ideal for up scaling and modeling of reactive processes. These homogenous artificialrocks are then exposed to a CO2-enriched fluid in batch and flow through reactors and analyzed using traditionalmethods and High Resolution X-ray Computed Tomography (HRXCT). HRXCT is a nondestructive techniquethat allows a complete characterization of the artificial rocks in 3D up to sub-micron resolution (400 nm). The 3Dimages from the HRXCT are then used as a verification basis for reactive transport models through porous media.Furthermore, because of the nondestructive nature of the technique, the changes (dissolution/precipitation) in theartificial samples due to the exposure to a CO2-enriched fluid, are analyzed on the same sample and the mineral-CO2 interactions can be quantified through time. By combining these experimental results on the same samplesthrough time with the models for reactive transport through porous media, the models can be validated and even-tually calibrated. This will later on help to understand more complex experiments on real reservoir materials andwill allow the optimization of the carbonation processes for the stabilization of mineral waste and the productionof innovative building materials.

Quantifying chemical and petrophysical alterations in porous materials by CO2 using HRXCT

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Quantifying chemical and petrophysical alterations in porous materials by CO2 using HRXCT

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