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Palinspastic reconstruction of synsedimentary tectonics of Neogene and Quaternary sediments in the Kloštar Field (Sava Depression, Pannonian Basin, Croatia)

The Kloštar Oil and Gas Field lies approximately 35 km east of Zagreb in the Sava Depression, near the SW margin of the Pannonian Basin. According to detailed palinspastic reconstruction, based on well log data, the Miocene de- posits are up to 1600 m thick and transgressive over Paleozoic magmatites and metamorphites. Oil reservoirs are within Miocene sandstones and tectonised Paleozoic basement. About 7 × 106 m3 of oil have been recovered to date. The field struc- ture is anticlinal, striking NW–SE, and is cut by transverse and longitudinal faults. Different tectonic styles through the Neogene and Quaternary, palinspastically restored, resulted in 20 tectonic blocks in the field forming separate hydrody- namic units. The main longitudinal fault is part of the Northern marginal fault of the Sava Depression and crosses the central field area. The fault’s character changes along strike, from normal in the north to reverse in the south. The vertical displace- ments along formation boundaries average up to 50 m (generally larger in younger sediments) with maximum displacement in the Late “Pontian” due to long-lasting transtension gradually changing to transpression. Cumulative displacement during the Neogene and Quaternary was about 600 m.

palinspastic reconstruction; sandstone thickness; kriging; Neogene; Quaternary; Kloštar Oil and Gas Field; Sava Depression; Croatia

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