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    Wyświetlanie 1-6 z 6
    Tytuł:
    Application of multivariate statistical methods for characterizing heterolithic reservoirs based on wireline logs : example from the Carpathian Foredeep Basin (Middle Miocene, SE Poland)
    Autorzy:
    Puskarczyk, E.
    Jarzyna, J.
    Porębski, Sz.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059820.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    log
    Principal Components Analysis
    Carpathian Foredeep
    Miocene
    heterolithic reservoir rock
    Opis:
    Principal Components Analysis (PCA) and Cluster Analysis (CA) were applied for well log data derived from heterolithic intervals drilled in two boreholes (Mrowla-1 and Cierpisz-2) in the Miocene fill of the Carpathian Foredeep. Both boreholes penetrated similar basement elevations conductive for structural trapping of hydrocarbons in an overlying thin-bedded heterolithic reservoir, which produces gas in commercial quantities in one borehole. The PCA was used to reduce data space preserving sufficient amounts of parameters for a differentiation between thin layers of sandstones and mudstones and between gas- and water-saturated horizons. In both boreholes, the number of logs was reduced to four significant principal components (PCs). Differences between gas-saturated and water-saturated layers were found. CA was used for the classification and grouping of data according to natural petrophysical features of the analysed rocks. The group corresponding to gas-saturated zones was found in the Cierpisz-2 borehole. It is concluded that PCA and CA can provide useful information for a more reliable identification of gas-saturated horizons.
    Źródło:
    Geological Quarterly; 2015, 59, 1; 157--168
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital rock models of Precambrian and Paleozoic tight formations from Poland
    Autorzy:
    Krakowska, P. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060584.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    digital rock models
    Precambrian sedimentary rocks
    Paleozoic sedimentary rocks
    petrophysical parameters
    statistical analysis
    petrophysical data
    Opis:
    Properties of selected Precambrian and Paleozoic sedimentary clastic rocks were analysed with respect to their reservoir potential. Multidimensional analysis of laboratory results and borehole logging data was used to construct digital models of pre-Mesozoic, deeply buried formations, present as tight, low-porosity and low-permeability rocks. This modern statistical and deterministic approach as applied to laboratory and borehole logging results worked to integrate data at different scales. The results obtained are useful not only in further scientific research but also found a use in industrial application. As a first step, statistical methods, including clustering and separation of homogeneous groups, enabled digital rock model creation on the basis of the results of such laboratory measurements as pycnometry, mercury porosimetry, nuclear magnetic resonance spectroscopy or computed X-ray tomography. Next, the models constructed were applied in borehole logging interpretation to find intervals with similar petrophysical properties within the group and different properties between the groups. This approach allowed implementation of upscaling procedures of laboratory experiments at micro- and nano-scale to borehole logging scale. High correlations were established between the log petrophysical parameters within the digital models. This approach can be used to divide the succession cored into intervals with different petrophysical parameters.
    Źródło:
    Geological Quarterly; 2017, 61, 4; 896--907
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-energy, microtidal nearshore deposits and their provenance (Lower Miocene, Burdigalian/Eggenburgian, Alpine-Carpathian Foredeep, Lower Austria)
    Autorzy:
    Nehyba, Slavomír
    Roetzel, Reinhard
    Powiązania:
    https://bibliotekanauki.pl/articles/2201202.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Alpine-Carpathian Foredeep
    Lower Miocene
    provenance analysis
    fair-weather vs. storm processes
    rock shoreline
    coastal morphology
    Opis:
    During the Early Miocene (Early Burdigalian/Eggenburgian) marine transgression at the southeastern margin of the Bohemian Massif, gradual flooding occurred along a rocky coast on granitic bedrock of the Thaya Batholith under high-energy, wave-dominated, microtidal and mixed fair-weather and storm conditions. Deposits of the Burgschleinitz Formation overlie a basal unconformity above a subaerial weathered basement surface (transgressive erosional surface) and are interpreted as a transgressive systems tract. The deposits can be divided into four facies associations/depositional environments, i.e., upper-shoreface, foreshore, gravelly beach and backshore/lagoon. Two stages of transgression and successive overtopping of the basement, with different coastal physiographies, were documented. During the initial stage of transgression a barrier island system developed with relatively fine-grained deposits, reflecting the flooding of the distant parts of the Thaya Batholith with a relative flat basement morphology. The subsequent continuation of the transgression led to the flooding of the more proximal parts of the Thaya Batholith with a steeper relief and formation of a rocky shoreline with deposition of gravelly sedi- ments along palaeo-sea cliffs or wave-cut platforms. While gravel clasts of the deposits investigated originate directly from the underlying granites of the Thaya Batholith, provenance studies show that metamorphic rocks of the Moravian Superunit in the hinterland were the main source of sands. This distant source material was probably delivered mainly by small creeks and alluvial fans to the nearshore. Significant differences in heavy mineral composition of the same formation in the wider vi cinity indicate primarily local sources and rapid deposition with subordinate longshore transport, which may reflect a complex coastal palaeogeography. The Lower Miocene deposits of the Burgschleinitz Formation investigated are a rare example of ancient rocky shore deposits, which generally have low preservation potential in the geological record.
    Źródło:
    Geological Quarterly; 2022, 66, 4; art. 66, no. 33
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda biplot w interpretacji danych złożonych (CDA) w geologii
    The biplot method in Compositional Data Analysis (CDA) in geology
    Autorzy:
    Labus, K.
    Labus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074772.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    interpretacji danych złożonych
    CDA
    biplot
    skład chemiczny wód podziemnych
    porowatość skały
    Compositional Data Analysis
    rock porosity
    groundwater chemical composition
    Opis:
    Compositional data consist of compositions of parts summing to some whole (e.g.: 100%, 1). Such "closed" data are very popular in geochemistry, sedimentology, hydrogeology and environmetrics. This paper presents the data visualization method by means of the biplot method - a statistical technique widely applied in Compositional Data Analysis. This method enables a graphical display of observations and variables on the same chart, in a way that approximates their correlation. In a biplot the observations are marked with points, and variables - by rays emanating from the origin. Both their lengths and directions are important to the interpretation. The paper presents two examples of implementation of biplots in analysis of hydrogeological and petrological data. The first example concerns petrological data set for pores and skeleton grains of different Polish sandstones. The biplot visualization unveiled a possible independence of subcompositions of transitional pores (T) and macropores (R), as well as submacropores (S) and skeleton grains (Re). The use of this method made it also possible to demonstrate the rule according to which the share of transitive pores decreases at the advantage of real macropores from younger to older rocks, what is related to diagenesis processes. The second example concerns interpretation of hydrological data on chemistry of mine water of the "Rydułtowy" coal mine. In this case the graphical interpretation of biplot revealed large relative variation between HCO3 –-Cl–, HCO3–-I – and HCO3–-Na+. Besides, on the same basis, possible independence between the ion couples: HCO3--Br–, Ca2+-Na+, HCO3–-Cl–, Br-Na+, HCO3–-Cl–and Ca2+-K+ was identified and consequently verified using statistical tests. Additionally, taking into account geometrical features of the relevant biplot, a formula was proposed for defining relationships between shares of ions: Ca2+, Mg2+, Na+ and Cl–<.sup>, SO42–, HCO>sub>3–. These relationships are most apparent for poly-ion groundwater of the active exchange zone, where the ratios of the above mentioned components are similar to each other, despite a slight predominance of SO42– and HCO3– fractions.
    Źródło:
    Przegląd Geologiczny; 2010, 58, 5; 436-442
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wrażliwości w modelowaniu hydrogeochemicznym na przykładzie systemów woda–skała–gaz
    Sensitivity analysis in hydrogeochemical modelling on the example of water–rock–gas systems
    Autorzy:
    Labus, Krzysztof
    Suchodolska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2061528.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    analiza wrażliwości
    modelowanie hydrogeochemiczne
    interakcje woda-skała-gaz
    sekwestracja geologiczna
    hydrogeochemical modelling
    sensitivity analysis
    water–rock–gas interactions
    geological sequestration
    Opis:
    Przedstawiono przykład analizy wrażliwości rezultatów otrzymywanych w modelowaniu systemów woda–skała–gaz do celów sekwestracji gazów kwaśnych (CO2 i H2S) na zmiany parametrów kinetyki reakcji. Z rezultatami stanowiącymi poziom odniesienia porównywano wyniki uzyskane po uwzględnieniu stałych tempa reakcji dla skalenia potasowego i klinochloru, podwyższonych lub pomniejszonych o jeden rząd wielkości. Różnice w zidentyfikowanych efektach petroteksturalnych i fizykochemicznych są pozornie niewielkie, gdyż wynikają z modyfikacji pojedynczego tylko parametru. W rzeczywistości, przy występowaniu wielu parametrów opisujących modelowany system, efekty z nimi związane mogą ze sobą interferować.
    The paper presents an example of sensitivity analysis of results obtained in modelling of water–rock–gas systems, for the purpose of acid gas sequestration (CO2 and H2S), for changes in reaction kinetics parameters. The reference level was compared to the results, including the elevated or reduced reaction rate constants of K-feldspar and clinochlore. Differences in the identified petrotextural and physicochemical effects are seemingly insignificant, as they result from the modification of a single parameter only. In fact, when there are many parameters describing the modelled system, the associated effects may interfere with each other.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2019, Hydrogeologia z. 16; 117-124
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geneza i geologiczne uwarunkowania rozwoju form osuwiskowych w środkowej części Obniżenia Noworudzkiego w Sudetach
    Origin and geological constraints for the development of landslide forms in the central part of the Nowa Ruda Basin, Sudetes
    Autorzy:
    Kowalski, Aleksander
    Powiązania:
    https://bibliotekanauki.pl/articles/20028318.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ruchy masowe
    głęboko osadzone osuwiska
    skały osuwiskowe
    analiza LIDAR DEM
    synklinorium śródsudeckie
    Sudety Środkowe
    mass movements
    deep-seated landslides
    rock topple
    LIDAR DEM analysis
    Intra-Sudetic Synclinorium
    Middle Sudetes
    Opis:
    The paper presents the results of field mapping and structural analyses conducted within the landslides situated near Ludwikowice K³odzkie, in the central part of the Nowa Ruda Basin (Middle Sudetes, SW Poland). The area affected by mass movements is located within the eastern limb of the Intra-Sudetic Synclinorium (Głuszyca Monocline) composed of Upper Carboniferous to Lower Permian (Rotliegend) sedimentary rocks. Nine individual landslide forms, ranging in area from 0.5 to 22.7 ha, including two landslide complexes (Sokółka landslides, 49.7 ha in total area) have been identified and described in terms of their origin and geological conditions. Studies of landslide morphology and structural analysis allow recognition of several types of mass movements. They include: (i) rotational landslides (landslides Sokółka 1-3 and 5); (ii) translational slides (landslides Miłków 1-3); (iii) deep-seated, compound landslides (landslide Sokółka 4), and (iv) topple evolving into deep-seated rotational (?) slide (Sławosz landslide). The studies repeatedly confirm the usefulness of analyses of LiDAR digital elevation models coupled with field investigations and structural analyses.
    Źródło:
    Przegląd Geologiczny; 2021, 69, 10; 666-697
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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