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    Wyświetlanie 1-7 z 7
    Tytuł:
    Gamma-ray and magnetic susceptibility correlation across a Frasnian carbonate platform and the search for "punctata" equivalents in stromatoporoid-coral limestone facies of Moravia
    Autorzy:
    Geršl, M.
    Hladil, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058866.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Moravian Karst
    Devonian
    limestones
    stratigraphy
    natural gamma-ray activity
    magnetic susceptibility
    Opis:
    A comparison of the HV-105 Křtiny gamma-ray log (carbonate platform margin and proximal slope, thickness of Frasnian beds ~270 m) with the three times thinner gamma-ray spectrometric section from Mokrá (inner platform, Frasnian ~93.5m) has significantly increased the reliability of stratigraphic correlation between the outer and inner platform areas, i.e. it has allowed strengthening of the detailed links between conodont-bearing and barren sequences. The detailed gamma-ray and magnetic susceptibility patterns also provide promising clues which might help trace the "punctata Zone" stratigraphic equivalents, located far in the interior of the platform stromatoporoid-coral facies.
    Źródło:
    Geological Quarterly; 2004, 48, 3; 283-292
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemical analysis for palaeoenvironmental interpretations : a case study of the English Wealden (Lower Cretaceous, south-east England)
    Autorzy:
    Akinlotan, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060616.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    elemental composition
    X-ray fluorescence
    spectral gamma-ray
    palaeoenvironments
    Lower Cretaceous
    south-east England
    Opis:
    The elemental composition of terrigenous sediments is extremely important for interpreting the depositional conditions of sedimentary basins especially when traditional data are not available or insufficient. For the first time in the published literature, the elemental composition of the Lower Cretaceous Weald Basin (south-east England) is presented via X-ray fluorescence (XRF) and Spectral Gamma-ray (SGR) methods. The concentrations of Zr, Cr, Ni, Rb, and Sr in varying quantities suggest that the sediments may have been sourced from a stable craton while the enriched redox-sensitive elements such as Mo and Co confirm the presence of anoxic and reducing conditions at the sites of deposition. The spectral gamma-ray data show that the sandstone facies are more radioactive than the adjacent mudstone and shale and this trend is consistent with a freshwater origin. The higher quantity of thorium in relation to uranium indicates humid and hot palaeoclimatic conditions at the source areas that favoured intense weathering. The results of these analyses reinforce the importance of the geochemistry of sedimentary rocks as useful tools for understanding the depositional conditions of sedimentary basins.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 227--238
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of archival borehole data to recognizing the primary mineral composition and diagenetic changes in Jurassic sandy rocks of the Polish Basin
    Autorzy:
    Wróblewska, Sara Marlena
    Powiązania:
    https://bibliotekanauki.pl/articles/2201221.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    petrofacies analysis
    Jurassic sandstones
    resistivity log
    gamma ray log
    spontaneous potential log
    Opis:
    With emphasis being placed on the re-examining of mature petroleum basins and reduction of the negative impact of the industry on the environment, the use of archival data in geological exploration is essential. This is especially important in regions where the old, Soviet-type tools were used in the past and which are now using modern, western logging equipment. The application of archival geological, geochemical and geophysical data allows recognition of reservoir formations without the use of modern measurements. For the purpose of this research, Jurassic sandy rocks identified in the archival borehole Z-GN4 were analysed. They appear to be a perfect target for further petroleum and geothermal exploration in the Polish Basin; however, variable mineral composition and diagenetic features can cause difficulties while estimating their reservoir properties. The difference between gamma ray and spontaneous potential shale volume parameter (clay difference) was applied together with gamma ray measurement to determine the impact of primary and diagenetic features on each sandy petrofacies. Based on an integration of detailed petrographic analysis of available core samples from Z-GN4 borehole with archival borehole logs, four different sandy petrofacies were distinguished. Moreover, deep resistivity and sonic logs were used to highlight the carbonate-cemented intervals. This study shows how the application of petrofacies analysis in archival datasets can support the interpretation of uncored intervals and upgrade the level of reservoir characterization.
    Źródło:
    Geological Quarterly; 2022, 66, 3; art. no. 24
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of primary composition and diagenetic mineralization on natural gamma-ray and density logs of Carboniferous sandstones of the Dęblin Formation
    Autorzy:
    Wróblewska, Sara
    Kozłowska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2058639.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    petrofacies analysis
    gamma-ray log
    density log
    diagenetic mineralization
    Dęblin Formation
    Lublin Basin
    Opis:
    The Carboniferous sandstone of the Dęblin Formation is one of the targets for the petroleum industry in the Lublin Basin in southeastern Poland. The formation's primary and diagenetic composition makes it difficult to estimate its reservoir properties. Based on a detailed analysis of core and petrographic samples, normalization of gamma-ray and density logs was made with respect to the grain-framework of the rock. Recounted logs were used for distinguishing 4 different sandstone petrofacies. For these petrofacies, ranges of gamma-ray and bulk density values were determined and the impact of primary and diagenetic mineral composition was estimated. The application of this petrofacies method can upgrade the level of reservoir characterization and support the interpretation of uncored intervals.
    Źródło:
    Geological Quarterly; 2019, 63, 4; 741--756
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spektrometryczne profilowanie gamma w odsłonięciach geologicznych : metody i przykłady zastosowania
    Handheld gamma-ray spectrometry at geological exposures : methods and applications
    Autorzy:
    Moskalewicz, Damian
    Powiązania:
    https://bibliotekanauki.pl/articles/20199952.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ręczna spektrometria
    promieniowanie gamma
    radionuklidy
    promieniotwórczość naturalna
    geofizyka
    Bornholm
    handheld gamma-ray spectrometry
    radionuclides
    natural radioactivity
    geophysics
    Opis:
    Handheld gamma-ray spectrometry (hGRS) is a valuable method for geological studies. It may be applied in correlations between well-logging and outcrop strata, enhance interpretations of sedimentological data, prospect radiogenic ores and geothermal resources, and identify radiogenic hazards for society. This paper aims to review and popularize one of the research methods based on a mobile device (hGRS) equipped with a BGO (bismuth germanium oxide) scintillator. The general concept of the research method is presented in this paper. The method's perspectives and limits based on reviewed literature. Advantages of hGRS include, e.g., low cost, short data acquisition time, the possibility of studying natural exposures, and a broad set of research applications. The main disadvantages comprise relatively modest resolution of acquired data and their difficult interpretation in complex geological formations. The review is backed by sample measurements performed in various geological exposures at Bornholm Island (Baltic Sea). Measurements comprised igneous rocks exposed in several quarries and sedimentary profiles near Liesti Valley and Muleby.
    Źródło:
    Przegląd Geologiczny; 2022, 70, 11; 806-815
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obliczanie ciepła radiogenicznego osadów cechsztynu i karbonu na podstawie danych geofizyki otworowej w rejonie rafy Brońsko
    Radiogenic heat of Zechstein and Carboniferous rocks calculated using well-logging data from the Brońsko Reef area
    Autorzy:
    Bała, M.
    Waliczek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074929.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ciepło radiogeniczne
    widmowe promieniowanie gamma
    geofizyka otworowa
    skały macierzyste
    radiogenic heat
    spectral gamma ray
    well logging
    source rocks
    Opis:
    Rocks characterized by an increased kerogene transformation ratio, which is an important indicator of hydrocarbon generation in petroleum exploration, generate more radiogenic heat as well. The goal of this paper was to evaluate radiogenic heat (A) in several boreholes drilled through Zechstein and Carboniferous deposits of the Brońsko Reef. Based on spectral gamma ray and Litho-Density Logs measurements, the quantitative concentration of radioactive elements including uranium, thorium and radioactive isotope of potassium (40K) was evaluated. These data along with bulk density were subsequently used to calculate the radioactive heat. The calculations were performed for boreholes B-2, B-3, B-4 and B-8, located in central part of the reef. Increased values of A appeared characteristic for the Main Dolomite, Zechstein limestone and Carboniferous deposits with high share of shales.
    Źródło:
    Przegląd Geologiczny; 2012, 60, 3; 155-163
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Promieniotwórczość naturalna skał paleozoicznych z rejonu Krzeszowic
    Natural radioactivity of the Paleozoic rocks from the area of Krzeszowice (southern Poland)
    Autorzy:
    Malczewski, D.
    Badera, J.
    Lizurek, G.
    Mirkowski, Z.
    Dorda, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074494.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    skała paleozoiczna
    tuf wulkaniczny
    promieniotwórczość naturalna
    badanie in situ
    Paleozoic rocks
    tuff
    melaphyre
    porphyry
    diabase
    limestone
    natural radioactivity
    in situ gamma-ray spectrometry
    Krzeszowice
    Polska
    Opis:
    In this paper results of natural radioactivity of 40K, 208Tl, 212Pb, 212Bi, 214Pb, 214Bi and 228Ac in common rocks raw materials mined in the Krakow vicinity measured in situ using a portable gamma-ray spectrometry are presented. The study area occupies the SE edge of regional geologic unit called Krakow–Lubliniec Zone. Most Upper Paleozoic rocks exposed in this area like tuff, porphyry, limestone, dolomite, diabase and melaphyre have great economic importance and are used in building and road construction industry. The activity concentrations of 40K for the measured Paleozoic rocks ranged from 53 Bq/kg (Carboniferous limestone) to 3150 Bq/kg (Permian tuff). The activity concentrations associated with 228Ac (232Th) varied from about 7 Bq/kg (Carboniferous limestone) to 56 Bq/kg (Permian tuff), whereas activity concentrations of 226Ra (238U) ranged from 19 Bq/kg (Devonian dolomite) to 43 Bq/kg (Devonian limestone). Besides, the natural radioactivity of the Jurassic limestones (widespread in this region) was measured for comparision with Devonian and Carboniferous limestones.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 9; 815-822
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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