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oa Petrophysical Signs of the Process of Mineral Carbonation of Basalts
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 17th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment, Nov 2023, Volume 2023, p.1 - 5
Abstract
Promising formations for the geological storage of CO2 could contain a large number of cations capable of actively reacting with solutions enriched with CO2. In particular, the volcanic rocks of the Vyhorlat-Hutinsky range (Transcarpathian region of Ukraine) are represented by various petrographic groups of rocks, where andesibasalts are predominate. There are the large volcanic massifs with thick layers of anadesibasalts, which are characterized by a more or less stable characteristic of properties and composition.
Using the analysis of the chemical composition of the rocks of Vyhorlat-Hutyn range, the goal is to find out the peculiarities of the change in their composition and physical properties in relation to the main factor of mineral carbonation (dissolution of calcium atoms) with the simultaneous fixation of petrophysical “signs” of this process. Changes in chemistry during mineral carbonation in basalts can be productively evaluated through the rate of calcium dissolution. Combined analysis of the behavior of petrochemical indices and petrophysical characteristics during changes in the solubility of calcium in basalts indicates an increase over time in the content of silicon, calcium, magnesium, sodium and a decrease in aluminum, iron, etc. Informative petrophysical signs of this process are a decrease in bulk density (up to 50%) and a sharp increase in porosity and permeability (ten times). The mentioned reaction processes of mineral carbonation have a strict discrimination with respect to the crystalline structure of volcanites, moderate to petrographic type and noticeable with respect to territorial groups of volcanites.