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    Wyświetlanie 1-3 z 3
    Tytuł:
    Testing the randomness of lithostratigraphic successions with the Markov Chain methods
    Autorzy:
    Doktor, M.
    Krawczyk, A.
    Mastej, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/191918.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Markov chain methods
    Monte Carlo methods
    coal-bearing successions
    Opis:
    The crucial role in the studies on layer successions in lithostratigraphic sections with the application of stochastic model of depositional processes represented by the Markov chain is played by correct estimation of the matrix of transition numbers between lithofacies expected in a random sequence. Methods known from the literature are iteration procedures, which do not ensure quick, general solution. Hence, we propose a universal method based upon the Monte Carlo simulation technique. This method enables the researcher to estimate precisely and reliably the expected matrix of facies transitions.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2010, 80, No 2; 163-166
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Middle Miocene deposits in Carpathian Foredeep : facies analysis and implications for hydrocarbon reservoir prospecting
    Autorzy:
    Lis, P.
    Wysocka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/191170.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    facies analysis
    littoral
    tidal
    shoreface
    neritic slope
    turbidites
    Markov chain analysis
    Opis:
    This sedimentological study was based on well cores from the Polish and Ukrainian parts of the Carpa- thian Foredeep. It revealed general heterogeneity of facies in the middle Miocene of the sedimentary succession in the basin. Fourteen sedimentary facies were distinguished and their origin was interpreted: massive, non-graded sandstones; normal-graded, massive sandstones, with and without a stratified uppermost part; hydroplastically deformed sandstones; planar-parallel-stratified sandstones; trough-cross-stratified sandstones; ripple-cross-lami- nated sandstones; heterolithic deposits, composed of thinly interlayered sandstone and mudstone; massive and laminated mudstones; and basal gypsum/anhydrite evaporites, often intercalated with mudstone. Four main modalities of vertical facies organization were recognized and attributed to the following environments: (1) the mid-late Badenian, shoal-water, evaporitic environment that preceded the latest Badenian–early Sarmatian, main phase of foredeep development; (2) a littoral, tidal environment of the inner parts of storm-influenced, coastal bays and tidal flats or possibly spit-sheltered lagoons; (3) a wave-dominated, littoral, sandy environment, considered to be shoreface, extended by waves, in front of advancing deltas; and (4) a neritic to subneritic, muddy, offshore slope, characterized by frequent incursions of tempestite and turbidite sand. The study contributed to a better understanding of the mid-Miocene depositional systems in the basin, with significant implications for ongoing hydrocarbon exploration. Interpretations of the origins of potential reservoir sandstones provided important information on their possible stratigraphic distribution in the basin fill. The potential, economic importance of stratigraphic hydrocarbon traps underscored the urgent need for a full-scale facies analysis and fully cored wells in strategic parts of the basin.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2012, 82, 3; 239--253
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An application of Markov chain analysis to studies on lithofacies sequences in the alluvial fans from the "Bełchatów" lignite deposit (Poland
    Zastosowanie analizy łańcuchów Markowa do badań sekwencji litofacji w stożkach napływowych w złożu węgla brunatnego "Bełchatów"
    Autorzy:
    Mastej, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/191575.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Markov chain analysis
    vertical lithofacies succession
    Bełchatów lignite deposit
    alluvial fans
    lacustrine limestones
    Opis:
    The Markov chain analysis was used to study on lithofacies sequences in alluvial fans enclosed in the main seam of the "Bełchatów" lignite deposit. Quantitative approach supported the qualitative results of sedimentological analysis - the origin of muds, clays and coaly clays as well as the presence of a barrier (peat bog) between the fans and the lake with carbonate deposition. It was found that ephemeral lakes located on the fan surface were favourable sites for development of peat bogs. Similarly, the same lakes evolving into the peat bogs were favourable environments for expansion of sand lobes of the fans. It was discovered that cyclicity in sediment succession was disturbed by erosion. The new model of lacustrine limestone deposition was proposed for the northwestern part of lake which borders the fans from the northwest.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2002, 72, No 3; 271-282
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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