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    Tytuł:
    Zastosowanie wskaźnika TAI (thermal alteration index) i analizy palinofacjalnej do określenia stopnia dojrzałości termicznej materii organicznej w utworach górnego permu i triasu w północnej części niecki nidziańskiej (Polska centralna)
    Application of the TAI (Thermal Alteration Index) and palynofacial analysis for determining the degree of organic matter termal maturity in the Upper Permian and Triassic deposits in the northern part of the Nida Basin (central Poland)
    Autorzy:
    Fijałkowska-Mader, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1834094.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Nafty i Gazu - Państwowy Instytut Badawczy
    Tematy:
    wskaźnik TAI
    palinofacja
    kerogen
    górny perm
    trias
    niecka nidziańska
    TAI
    palynofacies
    Upper Permian
    Triassic
    Nida basin
    Opis:
    Determining the thermal maturity of palynomorph based on their color is a method commonly used in hydrocarbon prospecting. The color of the outer membrane of miospores (exine) changes as a result of heating from pale yellow to black depending on the paleotemperature. Currently, there are many palynomorph color scales correlated with the value of vitrinite reflectance, temperature of burial and hydrocarbon generation stages. Due to the varied material, both in taxonomic and morphological terms, the author used the TAI AMOCO scale. Furthermore, the share of individual kerogen groups in palynofacies was analyzed in terms of their hydrocarbon potential. The Upper Permian and Triassic deposits from eleven boreholes located in the north part of the Nida Basin were investigated. They showed that the Triassic and in the Upper Permian samples from the Milianów IG 1 borehole, are dominated by the pale yellow to orange color of spores and pollen grains, corresponding to a TAI index from 1 to 4, i.e. the pre-generation, dry gas and the early oil generation windows. In turn, only the samples of the Upper Permian from the Pągów IG 1 borehole are dominated by the brown color of miospores, which corresponds to a TAI index from 4+ to 5, i.e. the peak oil prone. Dominant vitrinite reflectance Ro varies from 0,4% to 0,6%, so the degree of organic matter maturity in the Upper Permian and Triassic deposits is not very high, which indicates relatively low temperatures of sediment diagenesis (< 80°C). Analysis of palynofacies showed that the Upper Permian and Triassic deposits contain mixed and structural kerogen. Mixed kerogen, occurring in carbonate rocks, contains amorphous fine-scattered kerogen and “fluffy” of algae origin, as well as structural kerogen of terrigeneous origin, mainly exinite and vitrinite. Mixed kerogen is characterized by oil potential, whereas structural kerogen – by gas-oil potential.
    Źródło:
    Nafta-Gaz; 2020, 76, 8; 495-500
    0867-8871
    Pojawia się w:
    Nafta-Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Marine vs. terrestrial environments during Early Triassic deposition on the northeastern margin of the Central European Basin : a multidisciplinary study on the Middle Buntsandstein of the Bartoszyce IG 1 borehole, NE Poland
    Autorzy:
    Becker, Anna
    Fijałkowska-Mader, Anna
    Jasionowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2060144.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Lower Triassic
    northeastern Poland
    palynofacies
    clay mineralogy
    olite microfacies
    isotope geochemistry
    Opis:
    The Middle Buntsandstein Subgroup of the Lower Triassic of north-eastern Poland has been investigated in the context of possible marine ingressions into the Central European Basin. To better constrain these, palynofacies analysis and mineralogical analysis of mudstones were undertaken on samples taken from the Lidzbark and Malbork formations penetrated by the Bartoszyce IG 1 borehole, serving as stratotype section of both lithostratigraphic units. Microfacies and geochemical analyses, including C and O isotope analysis, were conducted additionally on oolitic limestones of the basal Lidzbark Formation (the lowermost Middle Buntsandstein), and the boron content was measured on all mudstone samples. Seven palynofacies types are distinguished: types 1 to 3 within the Malbork Formation and types 4 to 7 within the Lidzbark Formation. Types 1 and 2 originated on a floodplain, type 3 probably in a deltaic or barrier setting, and types 4 and 5 in a brackish lagoon or a more open basin, possibly of marine origin. Palynofacies type 6 reflects long transport and reworking, whereas palynofacies type 7 is interpreted as formed due to pedogenic processes. Clay minerals and quartz, accompanied by feldspars, calcite and dolomite are the main components of the mudstones investigated. The clay mineral association consists of illite or a mixture of illite and smectite, and chlorite. The Lidzbark Formation and the lowermost part of the Malbork Formation show less variability in mineralogical composition than the upper part of the Malbork Formation. Smectite admixtures were detected only in the upper part of the Malbork Formation (the uppermost Middle Buntsandstein). The boron content, achieved after aqua regia digestion, ranges from 70 to 121 mg/kg (96 mg/kg at average), oscillating generally around 90 mg/kg. A higher boron content, bound in silicate structure, is associated with the upper part of the Malbork Formation. All major mineralogical and geochemical changes coincide more or less with the transition from the supposed marine to the terrestrial environmental realm, interpreted from lithological and sedimentological observations within the lowermost part of the Malbork Formation. However, diagenetic alteration of the clay minerals, and of the boron content, could not be ruled out. The oolitic limestones, mainly grainstones, contain admixtures of quartz grains and rare bioclasts, the ooids nuclei being peloids or unrecognizable. The carbonates are almost exclusively composed of low-Mg calcite. A high content of Mg and the presence of small amounts of dolomite suggest that the ooids were primarily composed of high-Mg calcite and are comparable with similar Early Triassic deposits in Tethyan settings. The δ13C values range from -2 to +1%o VPDB, fitting well with the known ranges of Lower Triassic marine carbonates. An observed δ13C depletion towards the top of the oolite-bearing part of the section may reflect a local shallowing trend that led to overall salinity decrease. A possible connection with the one of the global oceanic geochemical episodes has to be tested further. The results obtained suggest a marine origin of the lower Middle Buntsandstein deposits studied and document a terrestrial origin for the upper Malbork Formation.
    Źródło:
    Geological Quarterly; 2020, 64, 4; 1023---1047
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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