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Article

Small Unconventional Hydrocarbon Gas Reservoirs as Challenging Energy Sources, Case Study from Northern Croatia

1
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, HR-10000 Zagreb, Croatia
2
Field Development, INA-Industry of Oil Plc., Av. V. Holjevca 10, HR-10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Academic Editor: Felix Barreras
Energies 2021, 14(12), 3503; https://doi.org/10.3390/en14123503
Received: 4 April 2021 / Revised: 8 June 2021 / Accepted: 10 June 2021 / Published: 12 June 2021
Small possible hydrocarbon gas reservoirs were analysed in the Bjelovar Subdepression in Northern Croatia. This area includes the Neogene–Quaternary, mostly clastics, sequences, reaching 3000+ metres in the deepest part. The shallow south-eastern part of the Drava Depression contains a subdepression characterised with several, mostly small, discovered hydrocarbon fields, where the majority are located on the northern subdepression margin. The reason is the large distance from the main depressional migration pathways and main, deep, mature source rock depocenters. However, two promising unconventional targets were discovered inside the subdepression and both were proven by drilling. The first are source rocks of Badenian, of kerogen type III in early catagenesis, where partially inefficient expulsion probably kept significant gas volumes trapped in the source rock during primary migration. Such structures are the Western Bjelovar (or Rovišće) and the Eastern Bjelovar (or Velika Ciglena) Synclines. The second promising unconventional reservoir consists of “tight” clastic lithofacies of mostly Lower Pontian located on the north-eastern margin of the subdepression. These are fine-grained sandstones with frequent alternations in siltites, silty and clayey sandstones. They are located on secondary migration pathways, but were never evaluated as regional reservoirs, although numerous drilling tests showed gas “pockets”. View Full-Text
Keywords: hydrocarbon gas; unconventional reservoirs; drilling; Neogene; Croatia hydrocarbon gas; unconventional reservoirs; drilling; Neogene; Croatia
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MDPI and ACS Style

Malvić, T.; Barudžija, U.; Pašić, B.; Ivšinović, J. Small Unconventional Hydrocarbon Gas Reservoirs as Challenging Energy Sources, Case Study from Northern Croatia. Energies 2021, 14, 3503. https://doi.org/10.3390/en14123503

AMA Style

Malvić T, Barudžija U, Pašić B, Ivšinović J. Small Unconventional Hydrocarbon Gas Reservoirs as Challenging Energy Sources, Case Study from Northern Croatia. Energies. 2021; 14(12):3503. https://doi.org/10.3390/en14123503

Chicago/Turabian Style

Malvić, Tomislav, Uroš Barudžija, Borivoje Pašić, and Josip Ivšinović. 2021. "Small Unconventional Hydrocarbon Gas Reservoirs as Challenging Energy Sources, Case Study from Northern Croatia" Energies 14, no. 12: 3503. https://doi.org/10.3390/en14123503

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