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    Wyświetlanie 1-9 z 9
    Tytuł:
    Influence of liquid-nitrogen freezing of gas-bearing shale rocks on their compressive strength
    Autorzy:
    Borek, Kinga
    Powiązania:
    https://bibliotekanauki.pl/articles/127596.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    hydraulic fracturing
    black shales
    freezing
    compressive strength
    modelling
    Opis:
    Any definable relation between falling temperature and the compressive strength of shale rocks should provide a useful predictive tool aiding optimization of the results of hydraulic fracturing. In this research, an automeasuring hydraulic press, a thermo-camera and the Fluent ANSYS software were used. The results of laboratory simulations, and the effects of experiments conducted on shale rocks to determine permanent changes in compressive strength, are presented. As both frozen rocks and rocks returned to room temperature show diminished compressive strength. It is suggested that prior freezing of rocks can increase the efficiency of fracturing.
    Źródło:
    Mineralogia; 2018, 49, 1/4; 7-16
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The mid-Famennian ammonoid succession in the Rhenish Mountains: the "annulata Event" reconsidered
    Autorzy:
    Korn, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058845.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Late Devonian
    Famennian
    Rhenish Mountains
    Ammonoidea
    black shales
    diversity
    Opis:
    The mid-Late Devonian pelagic sedimentary successions of the Rhenish Mountains and other regions show a double black shale horizon called the annulata Black Shale. It marks, at the species level, a prominent faunal turnover of ammonoids from the Prolobites delphinus Zone into the Platyclymenia annulata Zone. An analysis of ammonoid genera distribution, phylogenetic relationships, andmorphospace occupation demonstrates that the "annulata Event" does not correspond to a crisis of the group and does not fulfill the criteria of a major biotic event.
    Źródło:
    Geological Quarterly; 2004, 48, 3; 245--252
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Devonian facies variety in Iran: volcanism as a possible trigger of the environmental perturbation near the Frasnian-Famennian boundary
    Autorzy:
    Mahmudy Gharaie, M. H.
    Matsumoto, R.
    Kakuwa, Y.
    Milroy, P. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058813.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Frasnian-Famennian boundary
    Iran
    black shales
    ironstone
    greenhouse
    volcanism
    Opis:
    Upper Devonian successions surrounding the Frasnian-Famennian (F-F) boundary in Iran consist of mixed carbonate/silisiclastic deposits. The successions are characterized by conspicuous ferruginous limestones, clay-rich units, black shales, and mafic volcanic rocks that provide important insights into palaeoenvironmental conditions during this interval of Earth’s history. An increase of kaolinite/illite ratio in clays associated with the F-F boundary suggests that increased chemical weathering was facilitated by warm and humid climatic conditions. Distinctive ferruginous-oolite deposits overlying the crucial Frasnian-Famennian boundary interval indicate a high supply rate of Fe-bearing clay originated during enhanced weathering under such climatic conditions. Black shales associated with the F-F boundary are interpreted to be the result of a high primary productivity caused by an increased influx of land-derived nutrients and regional volcanic activity. Widespread rift-related, basaltic activity along eastern Laurussia and northern Gondwana during the mid-Late Devonian is believed to have contribution to this global warming surrounding the F-F boundary.
    Źródło:
    Geological Quarterly; 2004, 48, 4; 323-332
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lower Toarcian organic-rich sediments from the Tuscan Succession (Northern Apennines, Italy): preliminary results
    Autorzy:
    Perilli, N.
    Rodrigues, R.
    Veiga de Oliveira, L.
    Catanzariti, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061357.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    black shales
    Early Toarcian
    calcareous nannofossils
    Tuscan Nappe
    Northern Apennines
    Italy
    Opis:
    For the first time is here documented the presence of Lower Toarcian black shales in the lower portion of the Calcari e marne a Posidonia (Posidonia Marls auctt.) belonging to the Tuscan Nappe. It consists of alternations of 30 cm to 5 m thick black laminated marlstone and marly claystone, with TOC values ranging from 0.43% to 2.49%. Based on calcareous nannofossils, the basal portion of the Calcari e marne a Posidonia spans the Lotharingius hauffii to Carinolithus superbus zones, and the organic-rich interval lies within the Carinolithus superbus Zone.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 55-65
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Organic carbon accumulation events in the mid-Cretaceous rocks of the Pieniny Klippen Belt (Polish Carpathians) : a petrological and geochemical approach
    Autorzy:
    Wójcik-Tabol, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059136.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Pieniny Klippen Belt
    mid-Cretaceous
    oceanic anoxic events
    black shales
    geochemical indicators
    Opis:
    New petrological and geochemical data lead to a consistent depositional model of the Corg.-rich sedimentation within the Pieniny Basin during themid-Cretaceous. Considerable terrestrial runoff into the Pieniny Basin occurred during the late Albian. Detritalmacerals accumulated under aerobic conditions on the shelf and continental slope. Fertilization of surface water induced primary productivity; aerobic degradation of organic matter led to the development of an oxygen-minimumzone within mid-water. The oxygen-minimumzone spread over almost all of the Pieniny Basin (Albian/Cenomanian). At the same time, a stagnant pool developed in the Grajcarek Basin. During the mid-Cenomanian the O2 minimum zone retracted and covered only the shelf and upper/middle slope. Stagnant pools might have formed in the depressions. Turbidity currents flowed down the slope and deposited calciturbiditic sequences with organic detritus in the Branisko and Pieniny basins. At the end of the Cenomanian, isolated anoxic or even H2S-bearing basins existed on the shelf. The slope was still occupied by the oxygen-minimum zone. In the deepest part of the sea-floor a stagnant basin formed.
    Źródło:
    Geological Quarterly; 2006, 50, 4; 419-436
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Petrographic, palynological and geochemical recognition of dispersed organic matter in the black Anthracosia Shales (Sudetes, south-west Poland)
    Autorzy:
    Nowak, Grzegorz J.
    Górecka-Nowak, Anna
    Karcz, Przemysław Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2201206.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Intrasudetic Basin
    lacustrine black shales
    organic petrography
    palynofacies
    Rock-Eval pyrolysis
    petroleum source rocks
    Opis:
    We describe the organic petrography, palynology and Rock-Eval pyrolysis values of lacustrine black shales termed the Anthracosia Shales (Upper Carboniferous/Lower Permian) in the Intrasudetic Basin (Sudetes, SW Poland). Samples were taken from cores of two boreholes: Rybnica Leśna PIG 1 and Ścinawka Średnia PIG 1. Maceral composition, miospore assemblage composition, palynofacies and geochemical characteristics of dispersed organic matter in the Anthracosia Shales were used to determine conditions of the environment and to evaluate their petroleum potential. Data from both organic petrography and palynology analyses enabled recognition of three broadly distinct organic associations in these shales: bituminous, humic, and intermediate, while Rock-Eval pyrolysis revealed the presence of bituminous and humic kerogen types I and III. Type I corresponds to the bituminous association, with amorphous organic matter (AOM) dominant in the palynofacies, and type III corresponds to the humic association with phytoclasts prevailing in the palynofacies. The thermal maturity of the organic matter is determined by the values of: (1) vitrinite reflectance VRo = 0.53–0.73%, (2) palynomorph 3–4 colour index, and (3) Tmax = 443–447°C, which indicate oil window maturity. Some of the TOC results (1.6–2.9 wt.%) indicate that the Anthracosia Shales are good and very good petroleum source rocks, though the thickness of this interval is low (4–5 m). Shales with TOC values <0.5 wt.% prevail, and may be classifed as poor source rocks.
    Źródło:
    Geological Quarterly; 2022, 66, 4; art. 66, no. 36
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wstępna charakterystyka mineralogiczna czarnych łupków antrakozjowych z obszaru synklinorium śródsudeckiego
    Preliminary mineralogical characteristics of the Anthracosia Shales from the Intra-Sudetic Synclinorium
    Autorzy:
    Wójcik-Tabol, Patrycja
    Dąbek, Jolanta
    Nowak, Grzegorz J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2076184.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    węgiel
    synklinorium śródsudeckie
    czarne łupki jeziorne
    syderyt
    kaolinit
    carbon
    Intra-Sudetic Synclinorium
    lacustrine black shales
    siderite
    kaolinite
    Opis:
    Anthracosia Shales within the Pennsylvanian-Lower Permian continental succession from the Intra-Sudetic Synclinorium are lacustrine sediments, represented by black shales intercalated with sandstones/mudstones. Mineral composition of each lithology consists of quartz, feldspar, mica, clay minerals (including kaolinite, the content of which decreases upward the section), and carbonates (calcite and siderite). The section is a continuous record of reduction and rise in terrigenous input. Mineral detritus is least weathered in the uppermost part of the Anthracosia Shales. The sedimentation occurred under dysoxic conditions that were ventilated by bottom currents.
    Źródło:
    Przegląd Geologiczny; 2021, 69, 6; 389--392
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potencjał węglowodorowy środkowojurajskich czarnych łupków sferosyderytowych (formacja łupków ze Skrzypnego) pienińskiego pasa skałkowego w Polsce
    Source rock potential value of Middle Jurassic spherosyderitic black shales (Skrzypny Shale Formation) of the Pieniny Klippen Belt
    Autorzy:
    Golonka, J.
    Matyasik, I.
    Krobicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/183970.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    jura
    Pieniński Pas Skałkowy
    analiza Rock-Eval
    kerogen
    czarne łupki
    Jurassic
    Pieniny Klippen Belt
    Rock-Eval analysis
    organic-rich black shales
    Opis:
    The organic-rich sediments were deposited during the marly stage of the proto-Pieniny basin evolution (Early Jurassic-beginning of Middle Jurassic) when this basin was relatively narrow, before the origin of Czorsztyn Ridge. After the ridge uplift sedimentation changed from anoxic to oxic, calcareous. The Rock-Eval pyrolytical analysis revealed that the Aalenian-Early Bajocian black spherosyderitic shales of the Skrzypny Shale Formation are enriched in the organic matter, but the character of kerogen and TOC content indicate the lack of good source rocks within the Middle Jurassic of the Pieniny Klippen Belt.
    Źródło:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2009, 35, 3/1; 43-55
    0138-0974
    Pojawia się w:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Środowisko sedymentacji i wczesna diageneza czarnych łupków ogniwa Passhatten (środkowy trias, Spitsbergen, Svalbard) na podstawie analizy geochemicznej
    Sedimentary environment and early diagenesis of the Passhatten Member black shales (Middle Triassic, Spitsbergen, Svalbard) in the light of geochemical analysis
    Autorzy:
    Karcz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074632.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    izotopy siarki
    węgiel organiczny
    czarne łupki
    trias środkowy
    ogniwa Passhatten
    Spitsbergen
    sulphur isotopes
    organic carbon
    black shales
    Middle Triassic
    Passhatten Member
    Opis:
    Geochemical analysis of the 50 samples of the Middle Triassic black shales (organic carbon-rich siltstones) has been carried out. The black shale samples (up to 4.92 % TOC) have been collected in the stratotype profile of the Bravaisberget Formation, west Spitsbergen. In the examined profile, the black shales occur exclusively in the Passhatten Member (the lower and middle interval of the Bravaisberget Formation). Black shale samples have been analyzed in respect to degree of pyritization (DOP), isotopic composition of pyrite sulphur (34S) and organic carbon content (TOC). The main goal of the research was to examine a degree of oxygenation and dynamics of a sea-bottom environment. DOPvalues from lower section of the Passhatten Member show wide variation, ranging from 0.29 to 0.92. In upper section of the member, the obtained DOPvalues show narrower range of variations, from 0.77 to 0.98.Wide variations of DOPwere caused by temporary coexistence of oxic and anoxic bottom currents. In turn, narrow DOP variations indicate predominance of stratified water and anoxic bottom currents. DOP/34S and DOP/TOC ratios imply that syngenetic and early diagenetic pyrite precipitation during accumulation of the lower section of the Passhatten Member was controlled by availability of organic carbon and reactive iron, whereas accumulation of the member's upper section was controlled exclusively by availability of reactive iron.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 10; 918-926
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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