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Uroš Barudžija
Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, HR-10000 Zagreb, Croatia

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Journal article
Published: 12 June 2021 in Energies
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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”.

ACS Style

Tomislav Malvić; Uroš Barudžija; Borivoje Pašić; Josip Ivšinović. Small Unconventional Hydrocarbon Gas Reservoirs as Challenging Energy Sources, Case Study from Northern Croatia. Energies 2021, 14, 3503 .

AMA Style

Tomislav Malvić, Uroš Barudžija, Borivoje Pašić, Josip Ivšinović. Small Unconventional Hydrocarbon Gas Reservoirs as Challenging Energy Sources, Case Study from Northern Croatia. Energies. 2021; 14 (12):3503.

Chicago/Turabian Style

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

Journal article
Published: 29 June 2020 in Processes
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The basic principles of geological risk calculation through probability of success (PoS) are mostly applied to numerical estimation of additional hydrocarbon existence in proven reservoirs or potential hydrocarbon discoveries in selected geological regional subsurface volumes. It can be adapted and validated for a comprehensive input dataset collected in the selected petroleum province, by dividing up geological events into several probability categories and classes. Such methodology has been widely developed in the last decades in the Croatian subsurface—mostly in the Croatian Pannonian Basin System (CPBS). Through the adaptation of geological categories, it was also applied in hybrid, i.e., stochastic, models developed in the CPBS (Drava Depression), mostly for inclusion of porosity values. As the robustness of this methodology is very high, it was also modified to estimate the influence of water-flooding in increasing oil recovery in some proven Neogene sandstone reservoirs in the CPBS (Sava Depression). This new modification is presented to be applied to geological risk calculation, intending to assess the safety of geological environment storage in deep wells, where spent nuclear fuel (SPN) would be disposed, a subject of great importance. The conceptual study encompassed the magmatic and metamorphic rocks in the pre-Neogene basement of the CPBS, intended to be used for such purpose. Regionally distributed lithologies are considered for nuclear waste disposal purpose, in order to detect the safest ones, considering petrophysical values, water saturation, recent weathering and tectonic activity.

ACS Style

Tomislav Malvić; Maria Alzira Pimenta Dinis; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Marija Bošnjak; Uroš Barudžija; Želimir Veinović; Hélder Fernando Pedrosa E Sousa. Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Conceptual Study in the Pre-Neogene Basement in the Northern Croatia. Processes 2020, 8, 755 .

AMA Style

Tomislav Malvić, Maria Alzira Pimenta Dinis, Josipa Velić, Jasenka Sremac, Josip Ivšinović, Marija Bošnjak, Uroš Barudžija, Želimir Veinović, Hélder Fernando Pedrosa E Sousa. Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Conceptual Study in the Pre-Neogene Basement in the Northern Croatia. Processes. 2020; 8 (7):755.

Chicago/Turabian Style

Tomislav Malvić; Maria Alzira Pimenta Dinis; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Marija Bošnjak; Uroš Barudžija; Želimir Veinović; Hélder Fernando Pedrosa E Sousa. 2020. "Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Conceptual Study in the Pre-Neogene Basement in the Northern Croatia." Processes 8, no. 7: 755.

Preprint
Published: 26 May 2020
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The basic principles of geological risk calculation through Probability of Success (PoS) are mostly applied for numerical estimation of additional hydrocarbon existence in proven reservoirs or potential hydrocarbon discoveries in selected geological regional subsurface volume. It can be tailored and validated for a comprehensive input dataset collected in the selected petroleum province, adapted by dividing up geological events into several probability categories and classes. The most applied categories are (existence of) reservoir rocks, traps and isolators, source rocks, migration pathways and preservation conditions for hydrocarbons The methodology results in unique probability values as multiplication of independent statistical events, which can also be applied in the assessment of a potential hydrocarbon discovery of desired minimal volume and its value in any virtual currency like risk-neutral dollars. Such methodology has been extensively developed in the last decades in the Croatian subsurface, mostly in the Croatian part of the Pannonian Basin System (CPBS). Through the adaptation of geological categories, it was also applied in hybrid, i.e., stochastical, models developed in the CPBS (Drava Depression). Stochastically estimation of porosity was already applied. As the robustness of this methodology is very high, it was also modified to estimate the influence of water-flooding in increasing oil recovery in some proven Neogene sandstone reservoirs in the CPBS (Sava Depression). This new modification is being presented to be applied to geological risk calculation, intending to assess the safety of geological environment in deep wells, where depleted radioactive fuel would be disposed, a subject of great importance. The case study encompassed the magmatic and metamorphic rocks in the pre-Neogene basement of the CPBS. For disposal purpose, these are regionally lithologies considered as to be the safest ones considering petrophysical values, water saturation, recent weathering and tectonic activity.

ACS Style

Tomislav Malvić; Maria Alzira Pimenta Dinis; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Marija Bošnjak; Uroš Barudžija; Želimir Veinović; Hélder Fernando Pedrosa E Sousa. Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Case Study in the Pre-neogene Basement in the Northern Croatia. 2020, 1 .

AMA Style

Tomislav Malvić, Maria Alzira Pimenta Dinis, Josipa Velić, Jasenka Sremac, Josip Ivšinović, Marija Bošnjak, Uroš Barudžija, Želimir Veinović, Hélder Fernando Pedrosa E Sousa. Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Case Study in the Pre-neogene Basement in the Northern Croatia. . 2020; ():1.

Chicago/Turabian Style

Tomislav Malvić; Maria Alzira Pimenta Dinis; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Marija Bošnjak; Uroš Barudžija; Želimir Veinović; Hélder Fernando Pedrosa E Sousa. 2020. "Geological Risk Calculation through Probability of Success (PoS), Applied to Radioactive Waste Disposal in Deep Wells: A Case Study in the Pre-neogene Basement in the Northern Croatia." , no. : 1.

Journal article
Published: 15 May 2020 in Geosciences
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Geomathematics is extremely important in geosciences, particularly in the geology. The key for any geomathematical analysis is the definition of a typical model to be applied for further prognosis, either through deterministic or stochastic approaches. The selection of the appropriate procedure is presented in this paper. Two different geomathematical subfield datasets were used in subsurface geological mapping and palaeontology and different biostatistics applications, representing important geomathematical subfields in the Croatian geology. The different subsurface interpolation methods tested, validated and recommended for application were used to obtain the best possible outcome in reservoir modelling, in the cases with small datasets. Cross-validation may be chosen as the main selection criteria, applied to the Croatian part of the Pannonian Basin System (CPBS). Recent advances in biostatistics applied in palaeontology and case studies from Croatia are also presented, where biometric studies are of significant importance in fossil biota. Data, methods and problems in geosciences are vast subjects, and address a wide spectrum of fundamental science. Because geology includes subsurface and surface geology, and very different datasets regarding variable and number of data, we have chosen here two representative case study groups with original samples from Northern Croatia. Subsurface mapping has been presented on limited petrophysical datasets from the Northern Croatian, Miocene, hydrocarbon reservoirs. Biostatistics have been presented on very different samples, allowing us to achieve paleoenvironmental reconstructions of the size of relevant fossils, such as dinosaurs or other species and their paleoenvironments. All examples highlight examples of the valuable application of geomathematical tools in geology. The results, cautiously validated and correlated with other, non-numerical (indicator, categorical) geological knowledge, are of enormous assistance in creating better geological models.

ACS Style

Tomislav Malvić; Marija Bošnjak; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Maria Alzira Pimenta Dinis; Uroš Barudžija. Recent Advances in Geomathematics in Croatia: Examples from Subsurface Geological Mapping and Biostatistics. Geosciences 2020, 10, 188 .

AMA Style

Tomislav Malvić, Marija Bošnjak, Josipa Velić, Jasenka Sremac, Josip Ivšinović, Maria Alzira Pimenta Dinis, Uroš Barudžija. Recent Advances in Geomathematics in Croatia: Examples from Subsurface Geological Mapping and Biostatistics. Geosciences. 2020; 10 (5):188.

Chicago/Turabian Style

Tomislav Malvić; Marija Bošnjak; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Maria Alzira Pimenta Dinis; Uroš Barudžija. 2020. "Recent Advances in Geomathematics in Croatia: Examples from Subsurface Geological Mapping and Biostatistics." Geosciences 10, no. 5: 188.

Preprint
Published: 27 April 2020
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Geomathematics is extremely important in geosciences, particularly in the geology. The key for any geomathematical analysis is the definition of a typical model to be applied for further prognosis, either through deterministical or stochastical approaches. The selection of the appropriate procedure is presented in this paper. Two different geomathematical subfield datasets were used in subsurface geological mapping and palaeontology and different biostatistics applications, representing important geomathematical subfields in the Croatian geology. The different subsurface interpolation methods, tested, validated and recommended for application, were used to obtain the best possible outcome in reservoir modelling, in the cases with small datasets. Cross-validation may be selected as the main selection criteria, applied to the Croatian part of the Pannonian Basin System (abbr. CPBS). Recent advances in biostatistics applied in palaeontology and case studies from Croatia are also presented, where biometric studies are of significant importance in fossil biota. Data, methods and problems in geosciences is a vast subject, and address a wide spectrum of fundamental science. Because geology includes subsurface and surface geology, and very different datasets regarding variable and number of data, here are chosen two representative case study groups with original samples from Northern Croatia. Subsurface mapping has been presented on limited petrophysical datasets from the Northern Croatian, Miocene, hydrocarbon reservoirs. Biostatistics has been presented on very different samples, allowing to achieve paleoenvironmental reconstructions of size of relevant fossils, as dinosaurs or other species and their paleoenvironments. All examples highlight examples of the valuable application of geomathematical tools in geology. The results, cautiously validated and correlated with other, non-numerical (indicator, categorical) geological knowledge, are of enormous assistance in creating better geological models.

ACS Style

Tomislav Malvić; Marija Bošnjak; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Maria Alzira Pimenta Dinis; Uroš Barudžija. Recent Advances in Geomathematics: Croatian Examples from Subsurface Geological Mapping and Biostatistics. 2020, 1 .

AMA Style

Tomislav Malvić, Marija Bošnjak, Josipa Velić, Jasenka Sremac, Josip Ivšinović, Maria Alzira Pimenta Dinis, Uroš Barudžija. Recent Advances in Geomathematics: Croatian Examples from Subsurface Geological Mapping and Biostatistics. . 2020; ():1.

Chicago/Turabian Style

Tomislav Malvić; Marija Bošnjak; Josipa Velić; Jasenka Sremac; Josip Ivšinović; Maria Alzira Pimenta Dinis; Uroš Barudžija. 2020. "Recent Advances in Geomathematics: Croatian Examples from Subsurface Geological Mapping and Biostatistics." , no. : 1.

Journal article
Published: 24 April 2020 in Rudarsko-geološko-naftni zbornik
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Middle Triassic deposits in the Karst Dinarides (south Lika area, near Gračac) were investigated for petrological, sedimentological and biostratigraphic determinations. Within two continuously recorded sections of sedimentary carbonates...

ACS Style

Duje Smirčić; Dražen Japundžić; Nikolina Gaberšek; Dunja Aljinović; Nediljka Prlj-Šimić; Katarina Krizmanić; Uroš Barudžija; Ivor Pavić. FIRST RECORD OF THE UPPER ILLYRIAN AMMONOID SUBZONE MARKER REITZIITES REITZI IN THE KARST DINARIDES. Rudarsko-geološko-naftni zbornik 2020, 35, 75 -84.

AMA Style

Duje Smirčić, Dražen Japundžić, Nikolina Gaberšek, Dunja Aljinović, Nediljka Prlj-Šimić, Katarina Krizmanić, Uroš Barudžija, Ivor Pavić. FIRST RECORD OF THE UPPER ILLYRIAN AMMONOID SUBZONE MARKER REITZIITES REITZI IN THE KARST DINARIDES. Rudarsko-geološko-naftni zbornik. 2020; 35 (2):75-84.

Chicago/Turabian Style

Duje Smirčić; Dražen Japundžić; Nikolina Gaberšek; Dunja Aljinović; Nediljka Prlj-Šimić; Katarina Krizmanić; Uroš Barudžija; Ivor Pavić. 2020. "FIRST RECORD OF THE UPPER ILLYRIAN AMMONOID SUBZONE MARKER REITZIITES REITZI IN THE KARST DINARIDES." Rudarsko-geološko-naftni zbornik 35, no. 2: 75-84.

Journal article
Published: 23 March 2020 in Stats
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Interpolation is a procedure that depends on the spatial and/or statistical properties of the analysed variable(s). It is a particularly challenging task for small datasets, such as in those with less than 20 points of data. This problem is common in subsurface geological mapping, i.e., in cases where the data is taken solely from wells. Successful solutions of such mapping problems depend on interpolation methods designed primarily for small datasets and the datasets themselves. Here, we compare two methods, Inverse Distance Weighting and the Modified Shepard’s Method, and apply them to three variables (porosity, permeability, and thickness) measured in the Neogene sandstone hydrocarbon reservoirs (northern Croatia). The results show that cross-validation itself will not provide appropriate map selection, but, in combination with geometrical features, it can help experts eliminate the solutions with low-probable structures/shapes. The Golden Software licensed program Surfer 15 was used for the interpolations in this study.

ACS Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. Application of the Modified Shepard’s Method (MSM): A Case Study with the Interpolation of Neogene Reservoir Variables in Northern Croatia. Stats 2020, 3, 68 -83.

AMA Style

Tomislav Malvić, Josip Ivšinović, Josipa Velić, Jasenka Sremac, Uroš Barudžija. Application of the Modified Shepard’s Method (MSM): A Case Study with the Interpolation of Neogene Reservoir Variables in Northern Croatia. Stats. 2020; 3 (1):68-83.

Chicago/Turabian Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. 2020. "Application of the Modified Shepard’s Method (MSM): A Case Study with the Interpolation of Neogene Reservoir Variables in Northern Croatia." Stats 3, no. 1: 68-83.

Journal article
Published: 29 February 2020 in Geosciences
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Morphometric analysis of Holocene pebbles from Sava River gravel in NW Croatia revealed shape distributions as observed along a 30 km long watercourse. Limestones, dolomites, and sandstones were identified as the major (>4%) and effusive magmatics in this alluvial aquifer system in Zagreb, with cherts and tuffs as minor pebble lithologies (up to 4%). Their distributions mainly indicate distant Alpine provenance for carbonate pebbles (limestone and dolomite) and local input for sandstones and minor lithotypes, laterally from the Samoborska Gora and Medvednica mountain. Carbonates are predominantly disc- and sphere-shaped, implying distant sources. Scattered distributions of pebble shapes (sphere, disc, blade, and rod) for sandstones and minor lithotypes possibly indicate multiple sources, some of them probably local. The tentatively interpreted “original sedimentary environments” for the main pebble lithotypes (calculated from their flatness ratios) possibly indicate that they are predominantly lake beach pebbles, followed by moraine and riverbed pebbles. However, these results should be strongly questioned.

ACS Style

Uroš Barudžija; Josipa Velić; Tomislav Malvić; Neven Trenc; Nikolina Matovinović Božinović. Morphometric Characteristics, Shapes and Provenance of Holocene Pebbles from the Sava River Gravels (Zagreb, Croatia). Geosciences 2020, 10, 92 .

AMA Style

Uroš Barudžija, Josipa Velić, Tomislav Malvić, Neven Trenc, Nikolina Matovinović Božinović. Morphometric Characteristics, Shapes and Provenance of Holocene Pebbles from the Sava River Gravels (Zagreb, Croatia). Geosciences. 2020; 10 (3):92.

Chicago/Turabian Style

Uroš Barudžija; Josipa Velić; Tomislav Malvić; Neven Trenc; Nikolina Matovinović Božinović. 2020. "Morphometric Characteristics, Shapes and Provenance of Holocene Pebbles from the Sava River Gravels (Zagreb, Croatia)." Geosciences 10, no. 3: 92.

Preprint
Published: 30 January 2020
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Morphometric analysis of Holocene pebbles from the Sava River gravels, in Zagreb alluvial aquifer system (NW Croatia), revealed distribution of their shapes along 30 km long observed watercourse. Limestones, dolomites and sandstones are determined as major (> 4%), and effusive magmatics, cherts and tuffs as minor lithotypes of the pebbles (up to 4%). Their distributions indicate mainly distant Alpine provenance for carbonate (limestones and dolomites) pebbles and local input for sandstones and minor lithotypes, laterally from the Samoborska gora and Medvednica Mts. Carbonates have predominately disc and sphere shapes, implying also their mainly distant sources. Scattered distributions of pebble shapes (sphere, disc, blade and rod) for sandstones and minor lithotypes indicate multiple sources, some of them probably local. Original sedimentary environments for main pebble lithotypes are tentatively interpreted from their flatness ratios, indicating predominant lake shore environments, followed by moraine and riverbed.

ACS Style

Uroš Barudžija; Josipa Velić; Tomislav Malvić; Neven Trenc; Nikolina Matovinović Božinović. Morphometric Characteristics, Shapes and Provenance of Holocene Pebbles from the Sava River Gravels (Zagreb, Croatia). 2020, 1 .

AMA Style

Uroš Barudžija, Josipa Velić, Tomislav Malvić, Neven Trenc, Nikolina Matovinović Božinović. Morphometric Characteristics, Shapes and Provenance of Holocene Pebbles from the Sava River Gravels (Zagreb, Croatia). . 2020; ():1.

Chicago/Turabian Style

Uroš Barudžija; Josipa Velić; Tomislav Malvić; Neven Trenc; Nikolina Matovinović Božinović. 2020. "Morphometric Characteristics, Shapes and Provenance of Holocene Pebbles from the Sava River Gravels (Zagreb, Croatia)." , no. : 1.

Journal article
Published: 21 January 2020 in Sustainability
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The authors analyse the process of water re-injection in the hydrocarbon reservoirs/fields in the Upper Miocene sandstone reservoirs, located in the western part of the Sava Depression (Croatia). Namely, this is the “A” field with “L” reservoir that currently produces hydrocarbons using a secondary recovery method, i.e., water injection (in fact, re-injection of the field waters). Three regional reservoir variables were analysed: Porosity, permeability and injected water volumes. The quantity of data was small for porosity reservoir “L” and included 25 points; for permeability and injected volumes of water, 10 points each were measured. This study defined selection of mapping algorithms among methods designed for small datasets (fewer than 20 points). Namely, those are inverse distance weighting and nearest and natural neighbourhood. Results were tested using cross-validation and isoline shape recognition, and the inverse distance weighting method is described as the most appropriate approach for mapping permeability and injected volumes in reservoir “L”. Obtained maps made possible the application of the modified geological probability calculation as a tool for prediction of success for future injection (with probability of 0.56). Consequently, it was possible to plan future injection more efficiently, with smaller injected volumes and higher hydrocarbon recovery. Prevention of useless injection, decreasing number of injection wells, saving energy and funds invested in such processes lead to lower environmental impact during the hydrocarbon production.

ACS Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. Increasing Efficiency of Field Water Re-Injection during Water-Flooding in Mature Hydrocarbon Reservoirs: A Case Study from the Sava Depression, Northern Croatia. Sustainability 2020, 12, 786 .

AMA Style

Tomislav Malvić, Josip Ivšinović, Josipa Velić, Jasenka Sremac, Uroš Barudžija. Increasing Efficiency of Field Water Re-Injection during Water-Flooding in Mature Hydrocarbon Reservoirs: A Case Study from the Sava Depression, Northern Croatia. Sustainability. 2020; 12 (3):786.

Chicago/Turabian Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. 2020. "Increasing Efficiency of Field Water Re-Injection during Water-Flooding in Mature Hydrocarbon Reservoirs: A Case Study from the Sava Depression, Northern Croatia." Sustainability 12, no. 3: 786.

Preprint
Published: 10 December 2019
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Interpolation is procedure that depends on spatial and/or statistical properties of analysed variable(s). It is special challenging task for data that included low number of samples, like dataset with less than 20 data. This problem is especially emphasized in the subsurface geological mapping, i.e. in the cases where data are taken solely from wells. Successful solutions of such mapping problems ask for knowledge about interpolation methods designed primarily for small datasets and dataset itself. Here are compared two methods, namely Inverse Distance Weighting and Modified Shepard’s Method, applied for three variables (porosity, permeability, thickness) measured in the Neogene sandstone hydrocarbon reservoirs (Northern Croatia). The results showed that pure cross-validation is not enough condition for appropriate map selection, but also geometrical features need to be considered, for datasets with less than 20 points.

ACS Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. Application of Modified Shepard's Method (MSM) case study with interpolation of Neogene reservoirs variables in the Northern Croatia. 2019, 1 .

AMA Style

Tomislav Malvić, Josip Ivšinović, Josipa Velić, Jasenka Sremac, Uroš Barudžija. Application of Modified Shepard's Method (MSM) case study with interpolation of Neogene reservoirs variables in the Northern Croatia. . 2019; ():1.

Chicago/Turabian Style

Tomislav Malvić; Josip Ivšinović; Josipa Velić; Jasenka Sremac; Uroš Barudžija. 2019. "Application of Modified Shepard's Method (MSM) case study with interpolation of Neogene reservoirs variables in the Northern Croatia." , no. : 1.

Article
Published: 14 August 2018 in Journal of Earth Science
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Middle Triassic volcaniclastic depositsin the External Dinarides of Croatia and Bosnia and Herzegovina are related to the rifting of the Tethyan Ocean. Three localities in the External Dinarides: Donje Pazarište, Bosansko Grahovo and Zelovo were biostratigraphically analysed in this study. The Middle Triassic carbonate deposits with volcaniclastic interlayers in Donje Pazarište were defined by means of conodonts. Rare ammonoid specimens were collected.Recovered conodont and ammonoid taxa suggest these sections are of Early Illyrian to Early Fassanian Age. The section studied in Bosansko Grahovo is dominantly composed of volcanic and volcaniclastic rocks. Limestone peperites were collected for conodont analysis. Two conodont zones were defined, suggesting volcanic activity in the same, from Lower Illyrian to Fassanian, time interval. The Zelovo Section was biostratigraphically investigated by several authors. The pietra verde deposits from Zelovo are referred as late Fassanian to Early Longobardian Age. Biostratigraphic correlation from mentioned three localities imply that the magmatic activity in the External Dinarides, and formation of different volcaniclastic facies lasted from Illyrian to Longobardian, similar as in the surrounding western Tethyan territories.

ACS Style

Duje Smirčić; Tea Kolar-Jurkovšek; Dunja Aljinović; Uroš Barudžija; Bogdan Jurkovšek; Hazim Hrvatović. Stratigraphic Definition and Correlation of Middle Triassic Volcaniclastic Facies in the External Dinarides: Croatia and Bosnia and Herzegovina. Journal of Earth Science 2018, 29, 864 -878.

AMA Style

Duje Smirčić, Tea Kolar-Jurkovšek, Dunja Aljinović, Uroš Barudžija, Bogdan Jurkovšek, Hazim Hrvatović. Stratigraphic Definition and Correlation of Middle Triassic Volcaniclastic Facies in the External Dinarides: Croatia and Bosnia and Herzegovina. Journal of Earth Science. 2018; 29 (4):864-878.

Chicago/Turabian Style

Duje Smirčić; Tea Kolar-Jurkovšek; Dunja Aljinović; Uroš Barudžija; Bogdan Jurkovšek; Hazim Hrvatović. 2018. "Stratigraphic Definition and Correlation of Middle Triassic Volcaniclastic Facies in the External Dinarides: Croatia and Bosnia and Herzegovina." Journal of Earth Science 29, no. 4: 864-878.

Journal article
Published: 01 January 2018 in Rudarsko-geološko-naftni zbornik
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Sedimentary and diagenetic features of Upper Triassic dolomites are determined and related to technical properties (apparent density, water absorption, open porosity and point load strength tested by Point Load Test, PLT) for possible...

ACS Style

Ana Maricic; Karlo Starčević; Uroš Barudžija. PHYSICAL AND MECHANICAL PROPERTIES OF DOLOMITES RELATED TO SEDIMENTARY AND DIAGENETIC FEATURES – CASE STUDY OF THE UPPER TRIASSIC DOLOMITES FROM MEDVEDNICA AND SAMOBOR MTS., NW CROATIA. Rudarsko-geološko-naftni zbornik 2018, 33, 33 -44.

AMA Style

Ana Maricic, Karlo Starčević, Uroš Barudžija. PHYSICAL AND MECHANICAL PROPERTIES OF DOLOMITES RELATED TO SEDIMENTARY AND DIAGENETIC FEATURES – CASE STUDY OF THE UPPER TRIASSIC DOLOMITES FROM MEDVEDNICA AND SAMOBOR MTS., NW CROATIA. Rudarsko-geološko-naftni zbornik. 2018; 33 (3):33-44.

Chicago/Turabian Style

Ana Maricic; Karlo Starčević; Uroš Barudžija. 2018. "PHYSICAL AND MECHANICAL PROPERTIES OF DOLOMITES RELATED TO SEDIMENTARY AND DIAGENETIC FEATURES – CASE STUDY OF THE UPPER TRIASSIC DOLOMITES FROM MEDVEDNICA AND SAMOBOR MTS., NW CROATIA." Rudarsko-geološko-naftni zbornik 33, no. 3: 33-44.

Conference paper
Published: 25 June 2017 in Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology
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Shales instability is a result of its mineralogical composition (especially content of different water sensitive clay) and its physico-chemical properties. In different laboratory research of shale/drilling fluid interaction conducted until now, researcher used different shale samples (original rock samples taken by the coring process, drilling cuttings, outcrop samples and artificial rock samples), different laboratory equipment and various inhibitive muds. There are two main problems related to the laboratory testing of shale samples’ quantity and quality. The main task of this paper was to examine the applicability of outcrop rock (shale) samples for laboratory research of shale/drilling fluid interaction. Rock samples were taken at natural shale outcrop on different locations in Croatia. In the first stage of the laboratory research, mineralogical composition and petrophysical properties of used shale samples were tested. In the second stage, shale samples’ swelling in different fluid were examined. After getting results of the shale swelling, new quantity of outcrop shale samples was taken, crushed to drilling cuttings size and placed in roller oven cells previous charged with different fluids. In the last stage, a dried (hot rolled) shale sample was used for preparation of the artificial shale samples. Generated artificial samples were used in further laboratory research.

ACS Style

Borivoje Pašić; Nediljka Gaurina-Međimurec; Petar Mijić; Uroš Barudžija. Application of Outcrops Rock Samples in Laboratory Research of Shale Drilling Fluid Interaction. Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology 2017, 1 .

AMA Style

Borivoje Pašić, Nediljka Gaurina-Međimurec, Petar Mijić, Uroš Barudžija. Application of Outcrops Rock Samples in Laboratory Research of Shale Drilling Fluid Interaction. Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology. 2017; ():1.

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Borivoje Pašić; Nediljka Gaurina-Međimurec; Petar Mijić; Uroš Barudžija. 2017. "Application of Outcrops Rock Samples in Laboratory Research of Shale Drilling Fluid Interaction." Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology , no. : 1.

Journal article
Published: 01 January 2016 in Rudarsko-geološko-naftni zbornik
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Vedran Sudar; Dunja Aljinović; Duje Smirčić; Uroš Barudžija. COMPOSITION AND PROVENANCE OF GRÖDEN SANDSTONE FROM THE VELEBIT MTS. Rudarsko-geološko-naftni zbornik 2016, 31, 53 -67.

AMA Style

Vedran Sudar, Dunja Aljinović, Duje Smirčić, Uroš Barudžija. COMPOSITION AND PROVENANCE OF GRÖDEN SANDSTONE FROM THE VELEBIT MTS. Rudarsko-geološko-naftni zbornik. 2016; 31 (1):53-67.

Chicago/Turabian Style

Vedran Sudar; Dunja Aljinović; Duje Smirčić; Uroš Barudžija. 2016. "COMPOSITION AND PROVENANCE OF GRÖDEN SANDSTONE FROM THE VELEBIT MTS." Rudarsko-geološko-naftni zbornik 31, no. 1: 53-67.

Journal article
Published: 01 May 2015 in Rudarsko-geološko-naftni zbornik
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Uroš Barudžija; RGN Faculty; Ana Maricic; Vlatko Brčić; Croatian Geological Survey. Influence of lithofacies and diagenetic processes on the physical and mechanical properties of carbonate rocks - case study from Sinawin-Sha'wa area, Libya. Rudarsko-geološko-naftni zbornik 2015, 30, 1 .

AMA Style

Uroš Barudžija, RGN Faculty, Ana Maricic, Vlatko Brčić, Croatian Geological Survey. Influence of lithofacies and diagenetic processes on the physical and mechanical properties of carbonate rocks - case study from Sinawin-Sha'wa area, Libya. Rudarsko-geološko-naftni zbornik. 2015; 30 (1):1.

Chicago/Turabian Style

Uroš Barudžija; RGN Faculty; Ana Maricic; Vlatko Brčić; Croatian Geological Survey. 2015. "Influence of lithofacies and diagenetic processes on the physical and mechanical properties of carbonate rocks - case study from Sinawin-Sha'wa area, Libya." Rudarsko-geološko-naftni zbornik 30, no. 1: 1.

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Published: 20 November 2014 in Geologia Croatica
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The B horizons of terra rossa soils developed on three different carbonate lithologies having variable insoluble residue contents were studied in Western Herzegovina. Comparison of their composition and properties illustrates to what extent mineral (especially clay mineral assemblage) and particle size composition of those horizons and the insoluble residue of the underlying carbonate rocks can be used as indicators of the polygenetic nature of terra rossa in this region. Terra rossa B horizons have characteristic red colours, neutral to slightly acid pH, high base saturation with calcium as the predominant cation and high CIA (Chemical Index of Alteration). The CIA values obtained are generally in accordance with mineral composition and particle size distribution of the analysed B horizons. The predominant clay mineral phases in B horizons and related insoluble residues match. Kaolinite is the predominant clay mineral phase in the B horizons overlying carbonate rocks containing low amounts of insoluble residue, while smectite predominates in calcarenites areas with a high insoluble residue content. However, the presence of plagioclase, gibbsite, chlorite-vermiculite mixed layer mineral and vermiculite in B horizons overlying carbonate rocks containing low amounts of insoluble residue support a polygenetic origin for the terra rossa. In contrast, terra rossa formed on calcarenites containing high amounts of insoluble residue might have formed almost exclusively from the parent carbonate rock although some influence of external materials (e.g. gibbsite) cannot be excluded. This investigation shows that in Western Herzegovina, an area with no important aeolian input, the content and mineral composition of carbonate rock insoluble residue plays a major role in terra rossa composition. We can tentatively conclude that the lower the insoluble residue content of the parent materials, the greater is the expectation of a more polygenetic origin for the terra rossa.

ACS Style

Goran Durn; Radica Ćorić; Neven Tadej; Uroš Barudžija; Vedran Rubinić; Stjepan Husnjak. Bulk and clay mineral composition indicate origin of terra rossa soils in Western Herzegovina. Geologia Croatica 2014, 67, 171 -183.

AMA Style

Goran Durn, Radica Ćorić, Neven Tadej, Uroš Barudžija, Vedran Rubinić, Stjepan Husnjak. Bulk and clay mineral composition indicate origin of terra rossa soils in Western Herzegovina. Geologia Croatica. 2014; 67 (3):171-183.

Chicago/Turabian Style

Goran Durn; Radica Ćorić; Neven Tadej; Uroš Barudžija; Vedran Rubinić; Stjepan Husnjak. 2014. "Bulk and clay mineral composition indicate origin of terra rossa soils in Western Herzegovina." Geologia Croatica 67, no. 3: 171-183.

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Published: 31 October 2010 in Geologia Croatica
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“White horizon” archaeological units consisting of carbonate concretions occur in the archaeological settlement of “Orovački vinogradi”, located near Bjelovar (NW Croatia). During archaeological excavation these horizons were considered to be the inhabitation-levels within the historical layering profile. Further sedimentological and mineralogical research and comparison of the profile with an anthropogenically unaffected site nearby (“Ciglenska strana”) required re-evaluation of this interpretation. These horizons of carbonate concretions are interpreted as the result of diagenetic processes developed within the Upper Pontian sequence of sands, clayey sands and sandstones. A sedimentary-diagenetic model is suggested for their formation. These results had consequences for the archaeological evaluation of the settlement and influenced further investigations at the locality.

ACS Style

Uroš Barudžija; Goran JakovljeviĆ; Dunja Aljinović; Vlatko Brčić; Neven Tadej. Characteristics, origin and geoarchaeological significance of carbonate concretions from the early Bronze Age locality „Orovački vinogradi“, (Bjelovar, Croatia). Geologia Croatica 2010, 63, 323–332 .

AMA Style

Uroš Barudžija, Goran JakovljeviĆ, Dunja Aljinović, Vlatko Brčić, Neven Tadej. Characteristics, origin and geoarchaeological significance of carbonate concretions from the early Bronze Age locality „Orovački vinogradi“, (Bjelovar, Croatia). Geologia Croatica. 2010; 63 (3):323–332.

Chicago/Turabian Style

Uroš Barudžija; Goran JakovljeviĆ; Dunja Aljinović; Vlatko Brčić; Neven Tadej. 2010. "Characteristics, origin and geoarchaeological significance of carbonate concretions from the early Bronze Age locality „Orovački vinogradi“, (Bjelovar, Croatia)." Geologia Croatica 63, no. 3: 323–332.

Journal article
Published: 31 December 1999 in Journal of Geochemical Exploration
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Goran Durn; Slobodan Miko; Marta Čović; Uroš Barudžija; Neven Tadej; Ksenija Namjesnik-Dejanović; Ladislav Palinkaš. Distribution and behaviour of selected elements in soil developed over a historical Pb–Ag mining site at Sv. Jakob, Croatia. Journal of Geochemical Exploration 1999, 67, 361 -376.

AMA Style

Goran Durn, Slobodan Miko, Marta Čović, Uroš Barudžija, Neven Tadej, Ksenija Namjesnik-Dejanović, Ladislav Palinkaš. Distribution and behaviour of selected elements in soil developed over a historical Pb–Ag mining site at Sv. Jakob, Croatia. Journal of Geochemical Exploration. 1999; 67 (1-3):361-376.

Chicago/Turabian Style

Goran Durn; Slobodan Miko; Marta Čović; Uroš Barudžija; Neven Tadej; Ksenija Namjesnik-Dejanović; Ladislav Palinkaš. 1999. "Distribution and behaviour of selected elements in soil developed over a historical Pb–Ag mining site at Sv. Jakob, Croatia." Journal of Geochemical Exploration 67, no. 1-3: 361-376.