engleski

Prospects for CO2 carbonation and storage in Upper Miocene sandstone of Sava Depression in Croatia

Upper Miocene sandstones in the Sava Depression (Northern Croatia) are already reviewed as the potential target for CO2 based EOR process or mineral carbonation in the reservoir brine. In general such lithology, even rich with aluminosilicate minerals, is not the most favourable rock medium for efficient CO2 sequestration in minerals. In fact, those are ultramafic rocks and accompanied minerals. But, such process naturally happens in sandstones reservoirs where CO2 is injected and subdued to carbonation. The unfavourable is time scale of such sequestration, which is expressed into 104- 105 years period. Upper Miocene sandstones in the Sava Depression could incorporate up to 25% of aluminosilicate minerals (10% K- feldspars) and up to 20% dolomites and often are laterally changed with transitional lithofacies between dominantly pelitic and psammitic ones, rich in clay minerals (15% micas). Total volume of analysed reservoirs planned for injection in the Ivanić Field is ca. 107 and 62 million m3 (ca. 268 and 155 million t of rocks) retrospectively. There could be injected in oil saturated part ca. 22 and 6 million m3 (ca. 149 and 4 million t) retrospectively. Geochemical analogy and mineralogy could support prediction that few percent of injected CO2 be stored during carbonation and forming secondary minerals.

carbon dioxide ; carbonation ; secondary carbonate minerals ; Miocene ; sandstones ; Sava Depression ; Croatia

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