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The Pannonian basin system, shared by seven Central-Eastern European countries, is one of the most prospective areas of onshore CO 2 geological storage in Europe. In the Hungarian part of the Pannonian basin system, the storage could be realized in depleted hydrocarbon reservoirs and saline aquifers comprising dominantly Upper Miocene basin-filling sediments. The estimated overall potential for CO 2 storage exceeds 10 3 Mt in the case of the Hungarian part of the Pannonian basin system. The depleted hydrocarbon reservoirs correspond to this potential with limited, but well-defined capacities. However, saline aquifers represent large but indefinite capacities in the region. Furthermore, the accessibility of hydrocarbon fields is geographically limited in contrast to saline aquifers, which are regionally widespread in the Pannonian basin system. Structures that developed in the basin-filling Late Miocene strata may also have been CO 2 rich or pure CO 2 -containing natural reservoirs. These natural laboratories represent a unique opportunity to study long-term processes taking place in the reservoir–CO 2 system and can be used to predict physical and chemical processes that are characteristic for the subsurface development during and after CO 2 injection in depleted hydrocarbon or saline aquifer reservoir.
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Falus et al. (2024) studied this question.
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