engleski

The Neogene evolution and hydrocarbon potential of the Pannonian Basin in Croatia

Sedimentary basin fill of the Central Paratethys in Croatia consists of variable deposits. The oldest are the Egerian and Eggenburgian paralic and marine sediments that were determined only in the western marginal part of the studied area. The Neogene sedimentary sequence in major subsidences - the Sava and Drava Basins starts with Ottnangian-Karpatian transitional deposits that are covered by Badenian marine and Pannonian-Pontian brackish to freshwater formations. Pliocene and Quaternary terrestrial deposits cover major parts of the former depositional basins. Three stages of structural development of the SW Pannonian Basin are differentiated: initial structural changes between Oligocene and Early Miocene, main extensional processes that prevailed in Early and Middle Miocene and transpression during Pliocene and Quaternary. The newly formed structures are essential for hydrocarbon accumulation. The main source rocks are Lower to Middle Miocene marly limestones and limy marls. Hydrocarbon accumulations are found in the uplifted and fractured parts of the Neogene basement and in the Lower to Middle Miocene coarse-grained clastics, but the most important reservoir rocks are the Upper Miocene sandstones.

SW Pannonian Basin in Croatia; Basin evolution; HC accumulations

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