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Volume 65 Number 1
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

CO geosequestration is an efficient way to reduce greenhouse gas emissions into the atmosphere. Carbonate rock formations are one of the possible targets for CO sequestration due to their relative abundance and ability to serve as a natural trapping reservoir. The injected supercritical CO can change properties of the reservoir rocks such as porosity, permeability, tortuosity, and specific surface area due to dissolution and precipitation processes. This, in turn, affects the reservoir characteristics, i.e., their elastic properties, storage capacity, stability, etc.

The tremendous progresses made recently in both microcomputed X‐ray tomography and high‐performance computing make numerical simulation of physical processes on actual rock microstructures feasible. However, carbonate rocks with their extremely complex microstructure and the presence of microporosity that is below the resolution of microcomputed X‐ray tomography scanners require novel, quite specific image processing and numerical simulation approaches.

In the current work, we studied the effects of supercritical CO injection on microstructure and elastic properties of a Savonnières limestone. We used microtomographic images of two Savonnières samples, i.e., one in its natural state and one after injection and residence of supercritical CO. A statistical analysis of the microtomographic images showed that the injection of supercritical CO led to an increase in porosity and changes of the microstructure, i.e., increase of the average volume of individual pores and decrease in the total number of pores. The CO injection/residence also led to an increase in the mean radii of pore throats, an increase in the length of pore network segments, and made the orientation distribution of mesopores more isotropic. Numerical simulations showed that elastic moduli for the sample subjected to supercritical CO injection/residence are lower than those for the intact sample.

© 2017 European Association of Geoscientists & Engineers © 2016 European Association of Geoscientists & Engineers
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2016-03-31
2024-04-20

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Effect of supercritical CO2 on carbonates: Savonnières sample case study
Geophysical Prospecting 65, 251 (2017); https://doi.org/10.1111/1365-2478.12369
/content/journals/10.1111/1365-2478.12369
/content/journals/10.1111/1365-2478.12369
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  • Article Type: Research Article
Keyword(s): Carbonate reservoirs; CO2 storage; Digital rock physics workflow; Numerical modelling; Rock physics

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