16 research outputs found
Az Ă©rĂ©s Ă©s a szĂ©nhidrogĂ©n-kĂ©pzĹ‘dĂ©s folyamatainak összehasonlĂtása növĂ©nyieredetű (III-as Ă©s II/III-as átmeneti tĂpusĂş) Ă©s kĂ©nben gazdag II-es Ă©s III-as tĂpusĂş szerves anyagok esetĂ©ben
~100 db. III- Ă©s ~50 db. II/IIIS- ill. IIS-tĂpusĂş minta közĂĽl választottuk ki a pirolizálandĂłkat. Az alk-1-Ă©nek, n-alkánok, i-alkánok, izoprenoid szĂ©nhidrogĂ©nek (CH-k), alkil-benzolok, alkil-fenolok Ă©s tiofĂ©nek eloszlásait határoztuk meg szimuláciĂłs kĂsĂ©rletek (200-530°C) termĂ©keiben, Ă©s arányaik alapján: 1) alföldi pliocĂ©n lignitek között elkĂĽlönĂtettĂĽk a gázadĂł mintákat a kis kĹ‘olaj-potenciálĂşaktĂłl Ă©s az olajkĂ©pzĹ‘ktĹ‘l; 2) a ny. borsodi II. miocĂ©n szĂ©ntelep 2 közeli szelvĂ©nyĂ©ben eltĂ©rĹ‘ Ă©rettsĂ©gi mutatĂłkat (simonellit/retĂ©n) mĂ©rtĂĽnk, melyekrĹ‘l bizonyĂtottuk, hogy az eltĂ©rĹ‘ oxidáciĂłs hatások következmĂ©nyei; 3) palinolĂłgiailag jellemzett barnakĹ‘szenek közĂĽl ~40 mintát többfĂ©le mĂłdon pirolizáltunk Ă©s jellemeztĂĽk a botanikai Ă©s lápövi csoportok CH-potenciálját: a Taxodiaceae-Cupressaceae eredetűekĂ© (fillokladán tart.) a legkisebb Ă©s a Cupuliferae eredetűekĂ© a legnagyobb (Palmae, Ericaceae Ă©s Myricaceae minták köztesek); 4) 8 szĂ©n pirolĂzis sorozatai alapján: a CH-kĂ©pzĹ‘dĂ©s Ă©s a maradĂ©k kerogĂ©n CH-potenciál görbĂ©i egyedi utakat mutatnak, a meghatározĂł botanikai Ă©s lápövi hatások mellett a mikrobiális aktivitás mĂ©rtĂ©ke is döntĹ‘; 5) dunántĂşli potenciális kĹ‘olaj-anyakĹ‘zetek Ă©s a Zala-medence olajainak biomarkerei korreláciĂłja során, 4 kĹ‘olajrĂłl tĂ©teleztĂĽk fel, hogy Kösszeni márgábĂłl származik. MegállapĂtottuk hogy az illĂ©kony S-tartalom nagy rĂ©sze tiofĂ©nes a kĂ©n-gazdag minták pirolizátumaiban, mĂg a szegĂ©nyebbekben (Sorg/C<0,02), változĂ©kony a tiofĂ©nes kötĂ©sű S aránya. | Selected immature samples were pyrolysed (by Rock-Eval, py-GC, MSSV simulations, bulk-flow experiments) to study the hydrocarbon generation from diverse kerogens. 1) Samples from delta plain, interbedded by Pliocene lignites were investigated. Based on the relative proportions of oct-1-ene, (m+p)-xylene and phenol in pyrograms, the samples were divided into groups: gas-prone, gas-prone with moderate oil-potential, gas-prone with considerable oil-proneness. 2) Maturation diversity in close vicinity (conversion of simonellite to retene was observed in Miocene lignites and it was concluded that phenomenon caused by the different level of oxidation during sedimentation. 3) On the basis of pyrolyses, 50 brown coals were grouped from varied botanical assemblages (ferns, Taxodiaceae-Cupressaceae, Palmae, Cupuliferae, Myricaceae, Ericaceae etc.), from different mire zones, with different preservation of microfossils and stamp of biological activity. 4) 8 samples were analysed from the previous groups. At first, their artificial evolution paths shown considerable differences (inherited from diverse precursor sources, oxygen facies and grades of biological activity), but with increasing evolution the paths converged progressively. 5) On the basis of biomarkers, Kössen source rocks were correlated with oils from Transdanubia and found that the thermally labile type-II-S kerogens can generate sulfur-rich oils at low levels of thermal stress as a result of the cleavage of C-S
H and C isotope trends and anomalies in hot and mature oils from the Pannonian Basin
Abstract
Crude oil samples from uncommonly hot (>170°C) reservoirs of the SE-Pannonian Basin were studied for stable carbon and hydrogen isotope compositions of their different fractions. From two fields, 15 samples of different depths and temperatures were chosen for this study. The aim was to study the impact of extreme reservoir conditions on the isotope ratios of the different fractions and to find the ratios that show correlation with increasing depth and temperature.
We have shown that the behaviour of isotopes in these very hot oils differs from those from lower temperatures. The combined application of carbon and hydrogen isotope techniques is useful and may provide approximate information on reservoir conditions
Mantle-related CO<sub>2</sub>, metasedimentary HC-N<sub>2</sub> gas and oil traces in the Répcelak and Mihályi accumulations, W-Hungary — mixing of three fluids of very different origin
Numerous accumulations of CO2 and nitrogen-rich natural gas are known in the hot Pannonian Basin System (PBS), where even the mixture of these two fluids is a common phenomenon. The Danube Basin, part of the PBS, is characterized by the predominance of CO2 and nitrogen-rich natural gas over “normal” natural gas. The multistacked Répcelak and Mihályi gas accumulations (southern, Hungarian part of the Danube Basin) display an upward increase of nitrogen-rich natural gas at the expense of CO2. This study, using the abundant public data, the published results and the new biomarker data obtained from oil traces, attempts to explain the formation of these multistacked accumulations. A synoptic view of the vertical changes in gas composition, the maturation history of the basin and its basement, the chronology of the Neogene basaltic volcanism and the biomarker pattern of the oil traces resulted in the recognition of the metasedimentary origin of the nitrogen-rich natural gas and in a relative chronology of the mixing of the two gases and the oil
Szerves anyag a talajban és recens üledékekben = Organic matter in soil and recent sediments
Izolálási eljárás Ă©s analitikai mĂłdszerek fejlesztĂ©se, tesztelĂ©se A talajok Ă©s a recens ĂĽledĂ©kek szerves anyagának (OM) megismerĂ©sĂ©re alkalmas geokĂ©miai vizsgálati mĂłdszerek kifejlesztĂ©se az ĂĽledĂ©kes kĹ‘zetek szerves anyagának jellemzĂ©sĂ©re használt mĂłdszerek mĂłdosĂtásával törtĂ©nt. A projekt keretĂ©ben vĂ©grehajtott fejlesztĂ©sek hozzájárultak a Rock-Eval pirolĂzis felhasználási lehetĹ‘sĂ©geinek jelentĹ‘s bĹ‘vĂtĂ©sĂ©hez: (i) felhasználhatĂł a paleokörnyezeti rekonstruciĂłban, (ii) a pirogramok matematikai dekonvoluciĂłjával jĂł közelĂtĂ©ssel becsĂĽlhetĹ‘ az OM-t alkotĂł termikusan labilis Ă©s stabil biopolimerek, a humin anyag Ă©s a nagy stabilitásĂş OM rĂ©szaránya, a black carbon (BC) mennyisĂ©ge, (iii) matematikai mĂłdszerrel Ă©s kĂsĂ©rletileg is meghatározhatĂł a biopolimerek transzformáciĂłjának mĂ©rtĂ©ke. Az OM valamennyi - a vĂzoldhatĂł (fulvin- Ă©s huminsavak), a szerves oldĂłszerben oldĂłdĂł (lipid) Ă©s az oldhatatlan (rezisztens OM (ROM) Ă©s BC) - frakciĂłjának kvantitatĂv elválasztására kialakĂtott lĂ©pcsĹ‘zetes kĂ©miai izolálást kĂĽlönbözĹ‘ környezetekbĹ‘l származĂł mintákon teszteltĂĽk. A lipid, a BC Ă©s az ROM frakciĂłk rĂ©szletes geokĂ©miai vizsgálatával Ă©s a Rock-Eval pirolĂzissel nyert eredmĂ©nyek egyĂĽttes Ă©rtĂ©kelĂ©sĂ©vel lehetĹ‘vĂ© vált az OM felhalmozĂłdásában Ă©s transzformáciĂłs folyamataiban lĂ©nyeges szerepet játszĂł környezeti jellemzĹ‘k (Ă©ghajlat, redox-viszonyok, vĂzmĂ©lysĂ©g Ă©s trofitás), a prekurzor biomassza összetĂ©tele Ă©s a humán tevĂ©kenysĂ©g (pl. Ă©getĂ©s) változásainak nyomon követĂ©se Ă©s hatásának elemzĂ©se. | Development and testing of analytical methods and isolation protocol The modification of the geochemical methods developed for the characterization of the organic matter (OM) in sedimentary rocks, was needed when they were applied to OM present in soils and recent sediments. The results of this project suggest the use of Rock-Eval pyrolysis as a relevant tool to (i) estimate the relative contribution of labile and stable bio-macromolecules, humic substances and refractory fraction to the OM by mathematical deconvolution of pyrograms (ii) quantify the combustion-related black carbon, (iii) follow the formation of humic substances not only by mathematical method but also experimentally. Rock-Eval pyrolysis also proved to be an alternative proxy for reconstruction of the past environmental conditions. A chemical method for the quantitative isolation of all the water-soluble (fulvic, humic acids), organic-soluble (lipid) and insoluble (refractory OM (ROM) and black carbon) fractions was tested on samples representing different environments. Combined interpretation of Rock-Eval data with the results of the detailed geochemical investigations of lipid, black carbon and ROM fractions allowed one to identify variations in (i) the nature of source biomass, (ii) the type of the environment (forest, agricultural soil, wetland, shallow lake), (iii) the environmental conditions (climate, redox conditions, water level and trophity) and (iiii) human activity (burning of fossil fuels)
A magyarországi termálvĂz kincs szervesgeokĂ©miai jellemzĂ©se: termálvĂz - kerogĂ©n/bitumen kölcsönhatás geokĂ©miai kutatása = Organic geochemical characterisation of Hungarian thermal waters and study on interplay between thermal water and kerogen/bitumen in rocks
HĂ©vizeink szerves anyagai eredetĂ©t, minĹ‘sĂ©gĂ©t Ă©s viselkedĂ©sĂ©t kutatttuk. A vizsgálatok terĂĽletei: 1 a hĂ©vizek szerves Ă©s szervetlen fáciesĂ©nek kölcsönhatása, hĹ‘mĂ©rsĂ©klet-, mĂ©lysĂ©g- Ă©s idĹ‘fĂĽggĂ©s; 2 hĂ©vizek humin anyagai (aromás prekurzorok); 3 a szerves fácies változĂ©konyság: vegyĂĽletek minĹ‘sĂ©gi Ă©s mennyisĂ©gi eloszlásai, Ă©s hĹ‘mĂ©rsĂ©kletfĂĽggĂ©sĂĽk alapján; 4 lehetsĂ©ges prekurzor anyagok kĂsĂ©rleti termĂ©kei. MegállapĂtottuk, hogy a szervesanyagok bomlása során CO2, C2+-gázok, NH3 , Ă©s a kb. 80°C-os hĹ‘mĂ©rsĂ©kleti kĂĽszöb felett megindul az aromás szerves vegyĂĽletek keletkezĂ©se. A folyamat a szervetlen komponensekre is hat. A szerves komponensekre a hĹ‘mĂ©rsĂ©klet mellett a vizek kora Ă©s az áramlási Ăştvonal hossza is befolyásolja. A humin anyagok vizsgálata során megállapĂtottuk, hogy a huminsav nagyobb C Ă©s N, Ă©s kisebb O-tartalmĂşak Ă©s gazdagabbak cukrokban Ă©s aminosavakban, mĂg a fulvosavak alifásabb jellegűek Ă©s karboxilban gazdagabbak. A melegebb vizek molekulái kevesebb O, N, S, Ă©s több H atomot tartalmaznak. HĂ©vĂzminták szerves geokĂ©miai vizsgálatai során bevezettĂĽk az eredetmutatĂł fenantrĂ©n/antracĂ©n hányadost. Az emelkedĹ‘ hĹ‘mĂ©rsĂ©klet mennyisĂ©gi hatásait közel 50 vegyĂĽlet segĂtsĂ©gĂ©vel jellemeztĂĽk. Forrásanyagok (humin- Ă©s fulvosav, lignit, bitumen Ă©s szerves csapadĂ©k) 72 Ăłrás szimuláciĂłs kĂsĂ©rletei során 220-320°C hĹ‘mĂ©rsĂ©klet között illĂ©kony (benzol-naftalin) Ă©s PAH (naftalin- benzo(b)fluorantĂ©n) vegyĂĽleteket állĂtottunk elĹ‘, melyek a termĂ©szetben 80-140°C-on keletkeznek. | Research on origin, distribution and attitude of organic compounds of Hungarian thermal waters was carried out. Main scopes were: to study the inorganic and organic facies of waters, their interactions and temperature, depth and age dependence; study of humic compounds as possible precursors of aromatic compounds; study on the distribution of aromatic compounds and their temperature and facies dependence; and to do laboratory experiments on potential precursor materials. We observed that the decay of organic matter produces CO2, C1-C3-HC gases, NH3, and reaching a temperature threshold of ~80°C aromatic compounds are formed. The process has an impact on inorganic parameters too. The organic content of waters is influenced by temperature and age/flowpath of the waters. Humic acids are enriched in sugars and amino acids, contain more C and N, and less O, while fulvic acids have more aliphatic (less aromatic) character and are richer in carboxyl groups. Molecules in warmer samples contain less S, O, N and more H. We introduced the phenanthrene/anthracene ratio as an organic facies/genetic index. The impact of temperature was described through the concentration variation of ~50 compounds. Volatile (benzene-naphtalene) and PAH (naphtalene-benzo(b)fluoranthene) compounds were produced from precursors (humic, fulvic acids, lignite, bitumen, organic precipitates) during 72 hours simulations at 220-320°C temperatures. The same products form at 80-140°C in nature
Interaction and variation of isotopic age, temperature, organic and inorganic solutes in Hungarian thermal waters
Abstract
The geochemical facies of Hungarian thermal waters were the object of this study. Samples were separated into groups by relative ages (δ18O values). Mature and immature subgroups were formed on the basis of dissolved (semi)volatile organic compounds. The oldest (connate) waters form one group with a small number of samples. The subgroups containing different small molecular-sized soluble aromatics differ sharply in their chemical features (sodium, hydrogen carbonate, iodine, ammonium etc. content). The origin of the organic matter may differ in the subgroups as inferred by their different δ18O values and ten times greater halogen contents.
Our results show that the decomposition of organic matter produces small molecular-sized aromatic compounds and also influences the amounts of inorganic components in thermal waters, through the increase of feldspar hydrolysis and carbonate dissolution