Modelling of the subsurface relations in the wider soroundings of the town of Velika Gorica : master's thesis

Svrha ovog rada bila je digitalizirati strukturne karte i kartu paleoreljefa zapadnog dijela Savske depresije i napraviti 3D model koji bi se kasnije mogao koristiti u regionalnim istraživanjima ležišta ugljikovodika. Korišteno je šest karata koje su konstruirane po plohama elektrokarotažnog repera (Tg) i makera (Rs7, Rs5, Z', Rφ i α'). Navedene karte je konstruirala prof. emer. dr. sc. Josipa Velić za potrebe svoje disertacije. Digitalizacija navedenih strukturnih karta i karte paleoreljefa napravljene su u računalnom programu ArcMap 10.1, a trodimenzionalni model podzemlja u računalnom programu PetrelTM 2014. Modelirano područje se najvećim dijelom nalazi na području grada Zagreba te Zagrebačke i Sisačko – Moslavačke županije. Modelirano područje obuhvaća 960 km2. Konstruirano je 78 rasjednih ploha kojima su određeni glavni smjerovi pružanja i njihov razmještaj u prostoru. Izračunato je i statističko odstupanje izrađenog modela koje iznosi u prosjeku 0,6348 % što potvrđuje veliku točnost i preciznost prilikom izrade modela u odnosu na izvorne karte.Abstract: The purpose of this theis was to digitalize the structural maps and the paleorelief map of the western part of Sava Depression and make a 3D model that could later be used in regional exploration of hydrocarbon reservoirs. Six maps were constructed in total. One by pre-Neogen border (Tg) and five on E-log markers (Rs7, Rs5, Z ', Rφ and α'). The maps were originally constructed by PhD Josipa Velić, Professor Emeritus for her doctoral thesis made in the 1980'. The digitization of the structural maps and the paleorelief map were made in the computer program ArcMap 10.1 and the three-dimensional model of the subsurface was made in the computer program PetrelTM 2014. Research area is mostly situated around the city of Velika Gorica along with Zagreb and Sisak - Moslavina county, which roughly coveres 960 km2. The surfaces of 78 faults were designed and defined. Calculated statistical deviation of the model was an average of 0.6348%, which confirms high accuracy and precision when comapred to the original data

Middle Miocene serial killers: Drilled gastropods from the south-western margin of the Central Paratethys, Croatia

This paper focuses on traces of drilling predation in the middle Miocene gastropod assemblage of the Zaprešić Brijeg locality, Croatia, which provides further insight into the palaeoecology of the south-western margin of the Pannonian Basin System during the Badenian. The analyzed gastropod shells were collected in the first half of the 20th century, and are housed in the Croatian Natural History Museum (CNHM) in Zagreb. The CNHM Zaprešić Brijeg collections contain 11063 gastropod shells, of which 1024 have been identified as drilled (9.3% of the sample), with 633 successfully drilled, 113 unsuccessfully drilled, and 278 multiply drilled shells. The most represented families are Potamididae, Nassariidae, Clavatulidae, Turritellidae, Cerithiidae, Muricidae and Naticidae. The gastropod families Naticidae and Muricidae are recognized as the probable predators based on the shape of the drill holes. Middle Miocene (Badenian) gastropods drilling frequency at Zaprešić Brijeg is 5.72%, which is lower than the recorded Badenian gastropods drilling frequency in the Central Paratethys, while the overall gastropod prey effectiveness from the studied locality (15.15%) is higher than the average of the neighbouring Badenian localities in the Central Paratethys. Among the most represented gastropods at this locality, the highest drilling frequency occurs in the infaunal suspension feeders Turritellidae (14.45%), which mostly show traces of the naticid drilling

Neogene deposits of the western slopes of the Psunj Mt., Croatia: an overview of historical background and actualisation of geological research

On the crystalline rocks of the western slopes of the Psunj Mt. disconformably lie Neogene sediments with recorded deposits from the Lower Miocene to the Quaternary period. The basal Neogene sediments are in the older papers defined as “Oligomiocene” or “preTortonian”, today corresponding to the Lower Miocene sediments. These freshwater and marine-brackish sediments are transgressively overlain by the marine middle Miocene sediments. Badenian deposits are distributed as a continuous belt along the western slopes of the Psunj Mt., east from Pakrac and Lipik, with various lithofacies diversity. In the wider area they are a part of the structure Bijela Stijena–Novska. Lower Sarmatian rhythmic sediments conformably lie on the Badenian sedimentary rocks. The brackish and freshwater development is marked by the continuation of the Upper Miocene sedimentation, and Pliocene sediments with complete “Paludina beds” development mark the end of the Neogene. Dominant is the anticlinal structure – structure nose with an axis Bijela Stijena– Novska. In the core of the structure are crystallinic rocks. Neogene sediments are periclinal and almost continued along the limbs and forehead of the structure

Neogene deposits of the western slopes of the Psunj Mt., Croatia: an overview of historical background and actualisation of geological research

On the crystalline rocks of the western slopes of the Psunj Mt. disconformably lie Neogene sediments with recorded deposits from the Lower Miocene to the Quaternary period. The basal Neogene sediments are in the older papers defined as “Oligomiocene” or “preTortonian”, today corresponding to the Lower Miocene sediments. These freshwater and marine-brackish sediments are transgressively overlain by the marine middle Miocene sediments. Badenian deposits are distributed as a continuous belt along the western slopes of the Psunj Mt., east from Pakrac and Lipik, with various lithofacies diversity. In the wider area they are a part of the structure Bijela Stijena–Novska. Lower Sarmatian rhythmic sediments conformably lie on the Badenian sedimentary rocks. The brackish and freshwater development is marked by the continuation of the Upper Miocene sedimentation, and Pliocene sediments with complete “Paludina beds” development mark the end of the Neogene. Dominant is the anticlinal structure – structure nose with an axis Bijela Stijena– Novska. In the core of the structure are crystallinic rocks. Neogene sediments are periclinal and almost continued along the limbs and forehead of the structure

Geoenergy potential of the Croatian part of Pannonian Basin : insights from the reconstruction of the pre-Neogene basement unconformity

Presented work focuses on the importance of a prominent unconformity that separates the Neogene infill from older Palaeozoic and Mesozoic rocks in the Croatian part of Pannonian basin. Structure map of this horizon nearly represents the thickness map of the Neogene and Quaternary basin fill. Rock formations just below the unconformity are often heavily weathered, which resulted in favourable petrophysical properties, making them interesting from the aspect of geoenergy potential. The pre-Neogene surface was constructed in 1:400, 000 scale using publicly available subsurface maps of different scale and different level of detail. These maps were processed to enable their harmonization, compilation and construction of a structured surface with near-vertical fault planes. Supplemental maps were constructed via basin modelling, showing the temperature distribution in the subsurface, potential source rock maturity near the mapped horizon, surface heat flow and geothermal gradient distribution. Constructed maps are the first attempts to illustrate the importance of the mapped interval for regional planning of future geoenergy related research with possible direct implications to spatial planning