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    Wyświetlanie 1-3 z 3
    Tytuł:
    Origin of hydrocarbon gases accumulated in the Middle Cambrian reservoirs of the Polish part of the Baltic region
    Autorzy:
    Kotarba, M. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059071.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Polish Baltic Sea region
    Upper Cambrian-Tremadocian source rock succession
    thermogenic gases
    microbial methane
    hydrous pyrolysis
    stable isotopes
    Opis:
    The origin of natural gases associated with oil and condensate accumulations within the Middle Cambrian sandstone reservoirs on the Polish part of the Baltic region was characterized by means of molecular analyses, stable carbon isotopes of methane, ethane and propane, and stable hydrogen isotopes of methane. Gases generated from the Upper Cambrian-Tremadocian source rock succession by hydrous pyrolysis at 330°C for 72 h was used to characterize thermogenic gas and to identify the microbial methane input in the natural gas accumulations. A insignificant component of microbial methane is only present in gases from the B3 offshore field and from two inflows in the B7-1/91 borehole. The traps within the Middle Cambrian sandstone reservoirs had already been formed and sealed between the Late Cambrian and the Early Ordovician time span when migration of microbial methane took place along the fault system. The traps were successively supplied with thermogenic gaseous hydrocarbons, condensate and oil generated from the same source organic matter of the Upper Cambrian-Tremadocian source rock succession at a successively higher maturation stage.
    Źródło:
    Geological Quarterly; 2010, 54, 2; 197-204
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Origin of natural gases in the autochthonous Miocene strata of the Polish Carpathian Foredeep
    Autorzy:
    Kotarba, M. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191377.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    microbial methane
    stable carbon isotopes
    thermogenic hydrocarbon gases
    carbon dioxide
    nitrogen
    sulphide hydrogen
    autochthonous Miocene strata
    Polish Carpathian Foredeep
    Opis:
    Methane concentrations in natural gases accumulated in the autochthonous Miocene strata of the Polish Carpathian Foredeep (between Kraków and Przemyśl) usually exceeded 90 vol%. Methane and part of the ethane were generated during microbial reduction of carbon dioxide in the marine environment, mainly during the sedimentation of Miocene clays and muds. It is possible that this microbial process has continued even recently. Higher light hydrocarbons (mainly propane, butanes and pentanes) were generated during the diagenesis and the initial stage of the low-temperature thermogenic process. Very small changes in the values of geochemical hydrocarbon indices and stable isotope ratios of methane, ethane and propane with depth are evidence for similar gas generation conditions within the whole Badenian and Lower Sarmatian successions. Only in a few natural gas accumulations within the Upper Badenian and Lower Sarmatian reservoirs are thermogenic gases or thermogenic components present, both generated from mixed, type III/II kerogen. These thermogenic gases, now accumulated mainly in the bottom part of Miocene strata, probably resulted from thermogenic processes in the Palaeozoic– Mesozoic basement and then migrated to the Miocene strata along the fault zones. The presence of low hydrogen concentrations (from 0.00 to 0.26 vol%) within the Miocene strata is related to recent microbial processes. Carbon dioxide and nitrogen, which are common minor constituents, were generated in both microbial and low-temperature thermogenic processes. However, CO2 has also undergone secondary processes, mainly dissolution in water during migration. Hydrogen sulphide, which occurs in natural gases of Lower Badenian strata, was most probably generated during microbial sulphate reduction of the Lower Badenian gypsum and anhydrites.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2011, 81, No 3; 409-424
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potencjał węglowodorowy skał macierzystych i geneza gazu ziemnego akumulowanego w utworach miocenu zapadliska przedkarpackiego w strefie Rzeszowa
    Hydrocarbon potential of source rocks and origin of natural gases accumulated in Miocene strata of the Carpathian Foredeep in Rzeszów area
    Autorzy:
    Kotarba, M. J.
    Więcław, D.
    Kosakowski, P.
    Kowalski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074398.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    zapadlisko przedkarpackie
    miocen autochtoniczny
    kopalna substancja organiczna
    geochemia
    potencjał węglowodorowy
    gaz ziemny
    izotopy trwałe
    Carpathian Foredeep
    autochthonous Miocene
    organic matter
    hydrocarbon potential
    methane
    gas origin
    microbial processes
    organic geochemistry
    stable isotopes
    Opis:
    In the autochthonous Upper Badenian and Lower Sarmatian strata of the Carpathian Foredeep in the Rzeszów area the total organic carbon (TOC) contents vary from 0.02 to 1.26 wt. %(average 0.64 wt. %). Geochemical studies on the dispersed organic matter demonstrated the presence of gas-prone type III (humic) kerogen with small admixtures of algal type II kerogen. At depths less than 2,500 metres the organic matter is immature, thus microbial processes predominated. Methane concentration in natural gases accumulated within Miocene strata usually exceeded 94 vol. %and was generated by microbial reduction of carbon dioxide. Microbial methane was generated mainly during deposition of autochthonous Miocene sediments, but it is possible that this process continues today on a small scale. Higher gaseous hydrocarbons (mainly ethane and propane), which are usually minor constituents (concentrations less than 0.4 vol. %), were generated during diagenetic processes and at the initial stage of the low-temperature thermogenic processes. The slight changes in the geochemical indices of dispersed organic matter and isotope ratios of natural gases with depth are evidence of the homogeneity of deposition of humic organic matter in shallow marine basin during the Late Badenian and the Early Sarmatian and the fact that similar gas generation conditions can be found in the Miocene sequence. Generation and accumulation of microbial methane and the formation and charging multiple stacked reservoirs within the autochthonous Miocene strata, e.g., Palikówka, Jasionka, Stobierna and Terliczka deposits, was facilitated by rhythmic and cyclic deposition of clays and sands and their very high sedimentation rate.
    Źródło:
    Przegląd Geologiczny; 2005, 53, 1; 67--76
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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