Faculty of Mining, Geology and Petroleum Engineering Repository
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Tracing the evolution of the world's first mined bauxite from palaeotopography to pyritization: insights from Minjera deposits, Istria, Croatia
No full textThe Minjera bauxites are the first analysed and mined bauxites in the world. They are a group of pyritised bauxites situated in northern Istria, developed during the subaerial exposure phase which marked a major part of the Late Cretaceous and Palaeocene in northern Istria. In this study, the morphology, petrography, mineralogy, geochemistry as well as stable sulphur isotopes of the D-1 and D-15 deposits from Minjera were studied, as well as the evolution of their bedrock and cover. This study found that those two deposits differ in morphology, mineralogy and geochemistry as a consequence of their different palaeotopographical positions, with the D-1 deposit located at a higher position at the time of its formation compared to D-15, which led to the higher degree of leaching and desilicification in the D-1 deposit. The pyritisation in the studied deposits was a multi-phase process, which began with the deposition of framboidal pyrite and micrometre-sized anhedral pyrite, over which colloform pyrite was precipitated. This indicates that the solutions were initially supersaturated with iron sulphide, saturation of which subsequently changed, as finally euhedral, dendritic and acicular pyrite were deposited, indicating undersaturated conditions. The final stage was marked by deposition of pyrite veins. This formational sequence of pyrites is also supported by stable sulphur isotopes, as the δ34S values exhibit a wide range from -40.86 to 2.32 ‰, where lower values indicate an open system with an unrestricted sulphate supply in which supersaturated conditions could have been achieved, while the higher values indicate a change towards a closed system with limited sulphate supply. The organic matter necessary for microbial sulphate reduction was derived from the marshy environment established atop of the bauxite. The initial flooding started in the Palaeocene, with the first part of the sequence being deposited under lacustrine conditions, which changed towards fully marine with the deposition of Foraminiferal limestones
Seismostratigraphic interpretation of the Mesozoic succession in the area of Palagruža and Mljet island with a reference to the petroleum potential : master's thesis
No full textU sklopu ovoga rada, istraživan je mezozojski slijed karbonatnih naslaga u odobalju južnog Jadrana između Palagruže, Mljeta i Visa. Cilj rada je istražiti distribuciju facijesa mezozojskog slijeda naslaga te rekonstruirati paleogeografski odnos Jadranske karbonate platforme i pelagičkog bazena. Istraživanje je provedeno na temelju seta seizmičkih profila, podataka iz šest bušotina i objavljenih radova. Facijesna analiza paleogeografskih jedinica korištena je za analizu elemenata naftnogeološkog sustava u južnom Jadranu. Različiti seizmički facijesi definirani su na temelju amplitude, frekvencija i paleogeografskog položaja. Korelirani su s definiranim taložnim okolišima u bušotinama. Na seizmičkim podatcima kartirani su glavni stratigrafski horizonti definirani na bušotinskim podatcima, a to su srednjotrijaska diskordancija, krovina donjojurskih naslaga, krovina gornje jure i krovina mezozojskog slijeda naslaga. Po kartiranim stratigrafskim horizontima konstruirane su strukturne i paleogeografske karte. Dijelovi karbonatne platforme i dubljevodnog bazena kao i utjecaj solne tektonike i kenozojskih tektonskih pokreta na podzemne strukture jasno su vidljivi na seizmičkim podacima. Paleogeografskom rekonstrukcijom definiran je rub karbonatne platforme, glavna grebenska barijera, distribucija različitih grebenskih facijesa i zaštićenog dijela platforme, karbonatni padinski facijesi i facijesi pelagičkog bazena. Na temelju ove rekonstrukcije razmatrani su potencijalni „play“-evi i naftnogeološki elementi istraživanog područja. Opisani „play“-evi su „play“ padinskih naslaga, „play“ paleogeografskih strukturnih uzvišenja i „play“ solnih dijapira.Mesozoic carbonate succession in the offshore area of the Southern Adriatic, between Palagruža, Mljet, and Vis Islands was investigated. The aim was to map the distribution of facies within the Mesozoic succession and to reconstruct the paleogeographic relationship between the Adriatic Carbonate Platform (ACP) and the pelagic basin. The research utilized a set of seismic profiles, data from six wells, and data from published works. Facies analysis of paleogeographic units was used to analyse elements of the petroleum system in the Southern Adriatic. Various seismic facies were defined based on amplitude, frequency, and paleogeographic position. Correlations were made with defined parts of depositional environments in boreholes. Main stratigraphic horizons were identified from borehole data and interpreted on seismic data, including the Midd-Triassic unconformity, Top Lower Jurassic, Top Upper Jurassic, and Top Mesozoic succession. Structural maps and a paleogeographic map of stratigraphic horizons were constructed. Parts of the carbonate platform and deep-water basin, as well as the influence of salt tectonics and Cenozoic movements on subsurface structures, are clearly visible in seismic sections. Paleogeographic reconstruction revealed the margin of the carbonate platform, main reef barrier, distribution of different reef facies, restricted part of the platform, carbonate slope facies, and pelagic basin facies. Based on this reconstruction, three potential petroleum plays, and all their petroleum system elements of the study area were comprehensively defined. Plays include slope deposits, paleogeographic structural highs, and salt diapirs
Razvoj koda u programskom jeziku Python za izračun kvalitete plina uplinjenog na UPP terminalu Omišalj : završni rad
No full textU ovome radu opisan je postupak izračuna metanskoga broja u skladu s normom HRN EN
16726 - Plinska infrastruktura - Kvaliteta plina - Grupa H. Opisani je postupak zatim proveden
u programskom jeziku Python s ciljem izračuna metanskoga broja za nekoliko različitih sastava
UPP-a koji su uplinjeni na terminalu u općini Omišalj na otoku Krku. Rezultati dobiveni u
Pythonu uspoređeni su izračunatim metanskim brojevima u Excelu.. U konačnici, donesen je
zaključak o funkcionalnosti i efikasnosti ponuđenog koda za izračun metanskoga broja
Assessment of geothermal potential after the completion of hydrocarbon exploitation on the oil and gas field Kućanci – Kapelna : master's thesis
No full textNaftna industrija u Hrvatskoj ima dugu povijest, ali posljednjih se desetljeća bilježi pad proizvodnje nafte i plina zbog starenja eksploatacijskih polja i opadanja rezervi. Upravo zbog toga se očekuje povećanje broja napuštenih bušotina, koje su pogodne za revitalizaciju. Revitalizacija tih bušotina za geotermalnu energiju, posebno u panonskom bazenu s visokim geotermalnim potencijalom, predstavlja važan aspekt održivog upravljanja resursima. Takva revitalizacija podržala bi ciljeve dekarbonizacije i prijelaza na obnovljive izvore energije u skladu s energetskom tranzicijom. Jedno od polja koje su u procesu starenja je naftno – plinsko polje Kućanci – Kapelna. Pregledom bušotinske dokumentacije ovoga polja analizirat će se petrofizikalne karakteristike ležišta kako bi se odredila mogućnost revitalizacije bušotina u svrhu geotermalne energije.The oil industry in Croatia has a long history, but in recent decades, there has been a decline in oil and gas production due to aging of exploitation fields and decreasing reserves. This is expected to result in an increasment of of abandoned wells, this wells can be suitable for revitalization. Revitalizing these wells for geothermal energy, especially in the Pannonian Basin which has high geothermal potential, is an important aspect of sustainable resource management. Such revitalization would support decarbonization goals and the transition to renewable energy sources in line with energy transition. One of the currently aging fields is the Kućanci – Kapelna oil and gas field. By reviewing the well documentation of this field, the petrophysical characteristics of the reservoir will be analyzed to determine the feasibility of revitalizing the wells for geothermal energy purposes
Prezentacija novog sveučilišnog diplomskog studijskog programa RGN fakulteta Primijenjena geologija i geološko inženjerstvo : modul Geoenergija
No full textFourth regional unconformity in Istria - the Upper Eocene–Recent
No full textOnline workshop Western Istrian Anticline as an Ideal Natural Laboratory for the Study of the Regional Unconformities in Carbonate Rocks, Friday, April 12, 2024
The Berkovići (BIH) ML = 6.0 earthquake sequence of 22 April 2022 – seismological and seismotectonic analyses
No full textIn the southeast of Bosnia and Herzegovina, the Berkovi´ci earthquake sequence started with the mainshock on 22 April 2022 21:07 UTC at focal depth 22 km with magnitude ML = 6.0 (Mw = 5.7). Our preliminary estimation of the mainshock's maximum intensity is VII EMS for Berkovi´ci where 29% of buildings were damaged. We analysed the first nine months of this sequence, 22 April 2022–22 January 2023. The earthquakes were located using a guided grid-search algorithm with source-specific station corrections as a mean of solutions for 54 combinations of velocity models and program control parameters. The analysis of aleatory variation and epistemic uncertainty showed that they are very dependent on the station coverage, especially for focal depth. The event catalogue consists of 7217 earthquakes and can be considered complete for ML ≥ 1.3. Focal depths (15–30 km) are considerably larger than average for the Dinarides, but consistent within the zone of mid-crustal events where the earthquakes occurred. Focal mechanisms were determined with the first-motion polarity method for eight earthquakes: five of them, including the mainshock, were due to reverse faulting on faults striking in the Dinaric direction, with the preferred main fault gently dipping to the northeast. However, three events were due to normal faulting, unexpected for this area. We constructed a regional seismotectonic cross-section to delineate a potential seismogenic source of the mainshock, and it suggests that the mainshock occurred on the NE-dipping blind ramp of the basal thrust of the Dalmatian tectonic unit. Moreover, another NE-dipping and blind ramp of this basal thrust could be responsible for the Ston–Slano 1996 earthquake, located to the SW of the Berkovi´ci mainshock hypocentre at the horizontal distance of c. 35 km
Application of GIS technology in residue management : master's thesis
No full textSvrha izrade ovog rada je kartirati i prikazati na karti podatke o reziduima dobivene istraživanjima na lokaciji bivše tvornice Jugovinil u Kaštelu Sućurcu, naselju u gradu Kaštela. Za izradu karata korišten je računalni softver ArcGIS Desktop. Obrađivani su podaci o brzinama doza, koncentracijama radija-226 i radona, te koncentracijama teških metala. U teoretskom dijelu rada obrađeni su općeniti pojmovi vezani uz rad radi lakšeg razumijevanja rada. U praktičnom dijelu rada prikazani su rezultati u obliku karata. Dobiveni rezultati su zadovoljavajući.The purpose of this work is to map and display on the map the dana of NORM residues obtained from the research at the location of the former Jugovinil factory in Kaštela. The ArcMap program was used to create the maps. Data on dose rates, radium-226 and radon concentrations, and heavy metal concentrations were processed. In the theoretical part of the work, general terms related to the work are discussed for easier understanding of the work. In the practical part of the work, results are presented in the form of maps. The results of the work are satisfactory
Uloga mikroorganizama u procesu dolomitizacije : završni rad
No full textPostanak dolomita, bilo kao minerala ili stijene, tema je brojnih znanstvenih istraživanja, a još uvijek ne postoji jedinstveni model za proces dolomitizacije. Ovaj rad sažima povijesni pregled geneze dolomita prema McKenzie i Vasconcelos (2009). Suvremena istraživanja sugeriraju da mikroorganizmi mogu igrati ključnu ulogu u dolomitizaciji pod specifičnim uvjetima okoliša. Mikrobijalna aktivnost može potaknuti taloženje dolomita na niskim temperaturama, a mikrobijalna okruženja u geološkoj prošlosti mogu inicirati precipitaciju primarnog dolomita. Sedimentni slijed na Velebitu (Brušane) ukazuje na moguću ulogu mikroorganizama u procesu dolomitizacije. Istraženi dolomitni slijed upućuje na taloženje u niskoenergijskom okolišu, poput izolirane karbonatne platforme ili lagune. Precipitacija dolomita pri niskim temperaturama može biti povezana s mikroorganizama, a očuvana primarna struktura jedna je od ključnih karakteristika permskog dolomita. Suprotno tome, trijaski dolomiti pokazuju slabiju očuvanost primarne strukture, što ukazuje na manje povoljne uvjete dolomitizacije. Taloženje dijela permskog dolomita prepoznato je zbog prisutnosti isušenog mulja i mikrobijalnih lamina, što omogućuje pretpostavku o singenetskoj dolomitizaciji. Primarna dolomitizacija mogla je biti potaknuta snižavanjem morske razine, što sugerira dolomitizaciju po sabkha modelu. Međutim, šupljine otapanja u gornjopermskim dolomitima ukazuju na dijagenezu vadozne zone, što je u suprotnosti s evaporitnim uvjetima. Stoga je potrebno razmotriti nove uzroke dolomitizacije, uključujući ulogu mikroorganizama. Postoje sugestije da mikrobijalno katalizirajući procesi mogu dovesti do niskotemperaturne dolomitizacije bez potrebe za ekstremnim uvjetima prezasićenih otopina
The impact of oxygen content in biomethane on underground gas storage : master's thesis
No full textU diplomskom radu dan je pregled stanja i potencijala tržišta biometana u Europi s naglaskom na vodeće države po pitanju proizvodnje te aktualna energetska politika glede biometana. Prikazane u moguće metode pridobivanja biometana te popratno objašnjen sadržaj kisika u proizvedenom biometanu. Ukratko su prikazane mogućnosti skladištenja biometana te vrste podzemnih skladišta plina. Svrha ovog rada je prikaz mogućih posljedica sadržaja kisika iz biometana na podzemna skladišta plina, a navedeno je potkrijepljeno analizom eksperimentalnih rezultata. U konačnici, predstavljene su i moguće metode upravljanja sadržajem kisika u biometana te uvjeti odabira pojedine metode.The thesis provides an overview of the status and potential of biomethane in Europe, with a focus on leading countries in terms of production and current energy policies regarding biomethane. Possible methods of production are presented, along with an explanation of the oxygen content in the produced biomethane. The possibilities for biomethane storage and types of underground gas storage facilities are briefly described. The purpose of this work is to present the potential consequences of the oxygen content in biomethane on underground gas storage, supported by an analysis of experimental results. Finally, possible methods for managing the oxygen content in biomethane and the conditions for selecting each method are presented