Bjelovarska subdepresija kao prostor s konvencionalnim i nekonvencionalnim ležištima ugljikovodika te geotermalnom energijom
The Bjelovar Subdepression as an Area with Conventional and Unconventional Hydrocarbon and Geothermal Reserves

Summary/Abstract: The Bjelovar Subdepression is geologically very well defined area where are discovered proven hydrocarbon reserves. However, there are assumed as well potential hydrocarbon and geothermal reserves. Here is firstly given review of forming and application of fossil fuels and geothermal energy. It is followed by review of lithologies, depths and distributions of unconventional and geothermal reservoirs in subdepression parts where they are explored and assumed. Geothermal reservoir is studied in Mesozoic carbonates and Karpatian to Badenian coarse grained clastics in Velika Ciglena Syncline. It is the largest single structure in Velika Ciglena Syncline, where is proven geothermal water at depth more than 2500 m. However, it still is not proven and used for electricity of thermal applications. Unconventional hydrocarbon reservoirs are also assumed in the same area, i.e. in Upper Badenian, Sarmatian and Lower Pannonian sediments in the thermal mature phase. Also, such unconventional reservoirs, especially of gas, could be proven at subdepression margin, in the Bilogora Zone, in structures where conventional reservoirs are not proven (Cremušina, Gakovo), but are registered oil and gas shows in weakly permeable Upper Miocene sandstones.

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