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Caractérisation géophysique et géochimique des interactions fluide-roche à l'interface eau douce-eau salée : cas des carbonates récifaux de Majorque

Charlotte Garing 1 
1 Transferts en milieux poreux
Géosciences Montpellier
Abstract : In coastal carbonate aquifers submitted to a saline intrusion, water - rock interactions processes at the interface between freshwater and saltwater are a cause for heterogeneities development within the porous media. The dissolutions and precipitations induced by the mixing zone play a major role in the transport properties of the reservoir and so in the long term evolution of the saltwater intrusion. The characterization and the in situ observation of a current saline intrusion in the Llucmajor carbonate platform at the experimental site of Ses Sitjoles (South-Easth of Mallorca Island, Spain), allowed to study the temporal evolution of the saltwater intrusion and the biogeochemical processes active in the mixing zone. The influence of microstructure, characterized using X-Ray microtomography, on the petrophysical and flow properties was investigated in laboratory and flow-through experiments were also conducted to study the modifications of the microstructures when submitted to water - rock interactions processes. The mixing zone at the Ses Sitjoles site appears as quite thick and not very sensitive to climate and anthropic stress and is proved to be the locus of active microbiological activity. Laboratory studies highlight a strong control of the microporosity on transport processes and of pCO2 on water - rock interactions. The percolation experiments of slightly reactive waters reveal calcite dissolution together with a decrease in permeability due to a rearrangement of micro-grains within the microporous network.
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Submitted on : Wednesday, December 19, 2012 - 3:42:45 PM
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Charlotte Garing. Caractérisation géophysique et géochimique des interactions fluide-roche à l'interface eau douce-eau salée : cas des carbonates récifaux de Majorque. Géophysique [physics.geo-ph]. Université Montpellier 2, 2011. Français. ⟨NNT : ⟩. ⟨tel-00767152⟩

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