Transylvanian Basin is the one of the important gas province from Central and South-East Europe. The main geological structures for entrapment of the gas accumulations in this area are the unfaulted and faulted domes. These structures are generated by the diapiric activity of the Badenian saliferous formations (named the “Salt formation”). Thus, the salt domes from the Transylvanian Basin (mostly diapiric domes) appeared as result of the Badenian salt manifestation in correlation with the tectonic movement of the adjacent blocks. For tectonic relationship between salt layer and the rest of Upper Miocene deposits have been interpreted and correlated to the regional scale more than 200 of the seismic lines. This interpretation was possible due to the information derived from about 100 wells and outcrops, beside to the existing geological maps. Concerning the Miocene tectonic evolution, most of faults or system faults have affected the all Upper Miocene and Pliocene formations. Based on this new information the identified faults are grouped by their position in relation to the margins of basin in the western, central and northern group of faults.


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