Caprock analysis from the Mihályi-Répcelak natural CO2 occurrence, Western Hungary
  • Metaadatok
Tartalom: http://real.mtak.hu/41036/
Archvum: MTA Knyvtr
Gyjtemny: Status = Published




Type = Article
Cm:
Caprock analysis from the Mihályi-Répcelak natural CO2 occurrence, Western Hungary
Ltrehoz:
Király, Csilla
Szamosfalvi, Ágnes
Zilahi-Sebess, László
Kónya, Péter
Kovács, István János
Sendula, Eszter
Szabó, Csaba
Falus, György
Kiad:
Springer
Dtum:
2016-04-11
Tma:
QE Geology / földtudományok
QE01 Geophysics / geofizika
QE02 Geochemistry / geokémia
QE06 Petrology. Petrography / kőzettan, petrográfia
Tartalmi lers:
Caprock integrity is one of the most important
factors regarding the long-term safe underground storage of
CO2. As a result of geochemical reactions among the
caprock mineralogy and CO2 saturated pore water, the
physical properties of caprock such as porosity, permeability may change, which could affect its sealing capacity. Natural CO2 occurrences can help to understand these long term reactions under storage conditions on geological timescale. Our study area, the Miha´lyi-Re´pcelak natural CO2 occurrence, is believed to be leak-proof system on geological timescale. To identify and understand the mineral reactions in the caprocks we applied XRD, FTIR-ATR and SEM analysis of drill cores derived from the study area. The petrophysical properties of the studied rock samples were determined from the interpretation of geophysical well-logs and grain size distribution. The effective porosity (*4 %), permeability (0.026 mD) and clay content(*80 %) of the drill cores imply that the studied
clayey caprocks represent an adequate physical barrier to
the CO2. Our analytical results show that dawsonite has
formed within the caprocks. In most cases the dawsonite
crystallized after albite dissolution. This implies that CO2
or CO2-saturated brine can penetrate into the caprock
resulting in mineral reactions and most likely changing the
porosity and permeability of the sealing lithology. On the
other hand the caprock may react as a geochemical buffer
for the CO2 and, at least part of it, can be stored within the caprock as solid phase, thereby increasing the storage
capacity of the system.
Nyelv:
magyar
Tpus:
Article
PeerReviewed
info:eu-repo/semantics/article
Formtum:
text
Azonost:
Király, Csilla and Szamosfalvi, Ágnes and Zilahi-Sebess, László and Kónya, Péter and Kovács, István János and Sendula, Eszter and Szabó, Csaba and Falus, György (2016) Caprock analysis from the Mihályi-Répcelak natural CO2 occurrence, Western Hungary. Environmental Earth Sciences, 75. No.-635. ISSN 1866-6280
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