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| Titel |
Pore space quantification of carbonate rocks before-after supercritical CO2 interaction by optical image analysis |
| VerfasserIn |
Edgar Berrezueta, María José Domínguez-Cuesta |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250150046
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| Publikation (Nr.) |
 EGU/EGU2017-14469.pdf |
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| Zusammenfassung |
| The aim of this research is to show an experimental application of an automated
quantification process of optical porosity in thin sections. Petrographic studies using
scanning electronic microscopy, optical microscopy (OpM) and optical image analysis
(OIA) could provide a reproducible pore characterization of carbonate rocks in
applications related to the geological storage of CO2. This research is focused on i) the
quantification of optical pores in a carbonate rock before and after supercritical
CO2-rich brine (P ≈ 7.5 MPa and T ≈ 35 ºC) and ii) the description of the process
followed to guarantee the reproducibility of the OIA method on images acquired with
high-resolution scanner. Mineral images were acquired from thin sections using
a high-resolution scanner (HRS). Digital images were geo-referenced by using
geographic information system to ensure correct spatial correlation and superposition.
The optical measures of porosity by image analysis on the carbonates thin sections
showed an effective pore segmentation considering different cross-polarized light
conditions (90º/0º; 120º/30º) and plane-polarized light conditions (90º/-) of the same
petrographic scene. The pore characterization by OpM and OIA-HRS has allowed a
preliminary approximation of pore evolution in carbonate rocks under the supercritical
CO2-rich brine. This study shows a fast, effective and reproducible methodology that
allowed a preliminary characterization (changes in the pore network) of the samples
studied. The procedure carried out could be applied to similar experimental injection
tests. |
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