Qualitative and Quantitative Changes of Carbonate Rocks Exposed to SC CO2 (Basque-Cantabrian Basin, Northern Spain) - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Applied Sciences Année : 2017

Qualitative and Quantitative Changes of Carbonate Rocks Exposed to SC CO2 (Basque-Cantabrian Basin, Northern Spain)

Edgar Berrezueta
  • Fonction : Auteur
Timea Kovacs
  • Fonction : Auteur
Linda Luquot

Résumé

This study aims at the qualitative and quantitative determination of porosity, mineralogical and textural changes in carbonate rock samples after injection of (i) supercritical CO 2-rich brine and (ii) dry supercritical CO 2 , under similar experimental conditions (P ≈ 75 bar, T ≈ 35 • C, 970 h exposure time and no CO 2 flow). The studied rocks were sampled in the western Basque-Cantabrian Basin, North Spain, and consist of vuggy carbonates ("Carniolas") of the Puerto de la Palombera formation (Hettangian). Mineralogical and pore space characterization is completed using optical microscopy, scanning electron microscopy and optical image analysis. In addition, X-ray fluorescence analyses are performed to refine the mineralogical information and to obtain whole rock geochemical data and the brine composition is analysed before and after the experiment. Mineralogical and chemical results indicate that the carbonate rocks exposed to supercritical CO 2 in dry conditions do not suffer significant changes. However, the injection of supercritical CO 2-rich brine induces chemical and physical changes in the rock due to the high reactivity of calcite at the low pH conditions produced by the acidified brine. Numerical modelling validates the experimental observations. These results can be used to characterize the behaviour of carbonate rocks under conditions similar to the vicinity of a CO 2 injection well. The results should be considered only at the scale of the studied samples and not at reservoir scale.
Fichier principal
Vignette du fichier
applsci-07-01124.pdf (7.49 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-02319263 , version 1 (18-12-2020)

Licence

Paternité - Pas de modifications

Identifiants

Citer

Edgar Berrezueta, Timea Kovacs, Linda Luquot. Qualitative and Quantitative Changes of Carbonate Rocks Exposed to SC CO2 (Basque-Cantabrian Basin, Northern Spain). Applied Sciences, 2017, 7 (11), pp.1124. ⟨10.3390/app7111124⟩. ⟨hal-02319263⟩
55 Consultations
40 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More