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    Wyświetlanie 1-4 z 4
    Tytuł:
    Seismic stratigraphic analysis for hydrocarbon exploration in the Beta Field, Coastal Swamp Depobelt, Niger Delta
    Autorzy:
    Adeleye, Mutiu A.
    Yekeen, Kazeem O.
    Amidu, Sikiru A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841773.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    seismic stratigraphy
    system tracts
    sequence boundary
    depositional sequences
    reservoir presence
    Nigeria
    Opis:
    Hydrocarbon exploration analysis from a seismic stratigraphic approach was carried out within the Beta Field, Coastal Swamp Depobelt, Niger Delta, to identify system tracts and sequence boundaries that could be associated with potential hydrocarbon accumulation. 3D seismic volume and data from four wells were analyzed. Depositional sequences, system tracts, sequence boundaries, and candidate maximum flooding surfaces were picked from logs, while reflection patterns and terminations were interpreted from seismic sections. Log shapes from gamma rays in combination with seismic facies analysis were interpreted in order to delineate lithology, depositional environments and depositional sequences. Seismic attributes were extracted and were draped on gridded surfaces from the interpreted seismic horizons. These were integrated with structure maps to obtain structural and stratigraphic trends, and possible presence of reservoir sand. Five depositional sequences and nine seismic facies were identified within the field. The depositional sequences were designated Sequences S1 to S5 based on the depth of the occurrences and stacking patterns. This study reveals a progression from fluvial depositional settings to the shelf. The main reservoirs identified are the sand units of the highstand and lowstand within three depositional sequences (S1, S4 and S5) although interbedded sands within the TST of S4 and S5 are also suspected of being potential reservoirs. The channel sand deposits within the study area are suspected to be hydrocarbon bearing as they occurred within the complex fault trapping system popular in the Niger Delta. The application of seismic stratigraphy, as shown in this study, serves to encourage exploration in the Niger Delta where it could be effectively employed for reducing risk in hydrocarbon exploration.
    Źródło:
    Geology, Geophysics and Environment; 2020, 46, 4; 259-271
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedymentacja utworów miocenu we wschodniej części zapadliska przedkarpackiego
    Miocene deposition in the eastern part of the Carpathian Foredeep in Poland
    Autorzy:
    Dziadzio, P.
    Maksym, A.
    Olszewska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074465.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    miocen
    stratygrafia
    sedymentacja
    zapadlisko przedkarpackie
    Carpathian Foredeep
    Miocene
    stratigraphy
    depositional sequences
    Opis:
    Results of new biostratigraphical investigations correlated with nannoplankton zones permit to suggest that deposits which are filling the eastern, Polish part of the Carpathian Foredeep Basin include also the late Sarmatian and Panonian deposits. The filling of eastern parts of the Carpathian Foredeep, as in most foredeep basins, took place in two main stages; (1) underfilled flysch stage - lasting from the early Badenian to the lower part of late Badenian (Moravian– Wieliczian) and (2) overfilled molasse stage — lasting from upper part of the late Badenian to Panonian (Kosovian–Meotian). Classically, this flysch to molasse transition is interpreted as a record of the migration of the thrust wedge and foreland basin over the hinge line of the inherited passive margin. Also, the Badenian and Sarmatian successions are characterised by very diverse facies, which were deposited in various depositional environments. A detailed sedimentological analysis of cores, together with well log analysis, and seismic sections permitted to fit the stratigraphic column into a sequence stratigraphic framework. Within this framework, the Badenian and Sarmatian successions are interpreted to have been deposited within 3 third-order depositional sequences: the first two in the Badenian (not recognised in seismic scale), and the third during the Sarmatian, which consists of 4 fourth-order sequences (Dziadzio, 1999, 2000), with total thickness of 800 to over 3000 m. The M3 boundary is interpreted as a flooding surface within the fourth order, oldest Sarmatian depositional sequence. The M2 boundary corresponds to the boundary between two foraminiferal zones Anomalinoides dividens and Varidentella reussi, within the Sarmatian succession, which lies in the upper part of the second Sarmatian sequences, near the maximum flooding surface, in late phase of highstand sea level. The M1 boundary is interpreted as a transgressive surface within the third Sarmatian sequence. The boundary M0 marks transgressive surface within the fourth Sarmatian sequence and also is a stratigraphical boundary between two youngest foraminiferal zones Velapertina reussi and Porosononion granosum, and marks a border between the Wolhynian and Bessarabian stages.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 5; 413-420
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sequences of the lithofacies and depositional intervals in the Godula Beds of the Polish Outer Carpathians
    Sekwencje litofacji i interwałów depozycyjnych w warstwach godulskich Karpat
    Autorzy:
    Słomka, T.
    Słomka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/191192.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Carpathian flysch
    Markov chains
    sedimentary sequences
    deep-sea fans
    depositional lobes
    Opis:
    The Markov chains procedure was applied to the study on the sequences of lithofacies and depositional intervals in the Godula Beds (Turonian-Lower Senonian) of the Flysch Carpathians. The model (depositional) and modal (a most frequent in profile) diagrams were constructed and corresponding sequences were recognized. It was found that deposition from high-density turbidity currents of variable retardation rates was the dominating mechanism whereas the low-density turbidity currents were rather rare. The newly deposited sediments were commonly eroded by the succeeding, dense currents. Deposition processes were dominated by the two clearly separated environments: channels and depositional lobes. Their systems were subjected to frequent changes due to lateral migration caused by tectonic movements (uplift of cordilleras and subsidence of sea floor) and eustatic changes of sea level.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2001, 71, No 1; 35-42
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Jurassic-earliest Cretaceous evolution of the epicontinental sedimentary basin of southeastern Poland and Western Ukraine
    Autorzy:
    Gutowski, J.
    Popadyuk, I. V.
    Olszewska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059544.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Late Jurassic-earliest Cretaceous
    SW margin of the East European Platform
    stratigraphic correlation
    depositional systems
    sedimentary sequences
    synsedimentary tectonics
    Opis:
    The following Late Jurassic depositional systems have been recognized in the WUkrainian and SE Polish margin of the East European Platform: shelf slope/basin, open shelf, carbonate ramp, siliciclastic shelf, fluvial/playa, deltaic/swamp, restricted marine/evaporate lagoon. Three depositional megasequences have been identified. Their upper boundaries have been dated by means of targeted stratigraphic studies, compilation of existing data and reinterpretation of stratigraphic correlation concepts respectively as: lower Kimmeridgian divisum/hypselocyclum zones boundary, uppermost upper Kimmeridgian and lower Berriasian. Analysis of thickness and depositional system architecture within themegasequences in six regional cross-sections indicates that depocentre was located in the SW margin of the Mid-Polish Trough during Oxfordian and early Kimmeridgian times and propagated in Tithonian time to the Lviv region. This can be explained by changes in the palaeostress field. Approximately N–S oriented extension during Oxfordian and earliest Kimmeridgian times was replaced by approximately NE–SW oriented extension in Tithonian time. The thickness pattern of the megasequences as well as proximity trends of the system tracts within the sequences clearly coincide with the depocentre propagation.
    Źródło:
    Geological Quarterly; 2005, 49, 1; 31--44
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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