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    Wyświetlanie 1-3 z 3
    Tytuł:
    Analysis and modeling of petrophysical parameters of the Main Dolomite formation on the basis of well logging and seismic data
    Autorzy:
    Niepsuj, M.
    Krakowska, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/955192.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Main Dolomite
    lithofacies zone
    petrophysical parameters
    cementation factor
    Borai formula
    Shell formula
    fluid substitution
    seismic inversion
    Opis:
    The Main Dolomite is one of the most prospective hydrocarbon reservoir formations in Poland. The goal was to determine the Main Dolomite zonation in selected part of carbonate platform sedimentation area and also to analyze the influence of cementation factor on water saturation by well logging and seismic data integration. Well logging interpretation quantitatively characterized petrophysical parameters. Seismic inversion presented the distribution of the parameters at vertical and horizontal scales. Basic statistical calculations of petrophysical parameters, 2D crossplots and seismic inversion were made. The central part of the Main Dolomite interval indicated the best reservoir properties. High porosity values and low P-wave velocity, low bulk density and low water saturation values were observed in the analyzed zone. Mudlogging confirmed the occurrence of gas. Determination of hydrocarbon saturation in carbonates is a challenge for well logging interpretation and geophysical interpretation. The cementation factor is one of the main coefficients in petrophysics which strongly affect water saturation. Adopting the wrong value of this parameter causes serious error in the coefficient of the water saturation value. In the paper, water saturation was modeled using the Borai equation and Shell formula. By using the computed water saturation and fluid substitution method theoretical velocities of P-waves and S-waves (also P-wave/S-wave velocity ratio) were calculated. Results of the comprehensive interpretation of logs are the basis for lithology determination but P-wave and S-wave velocity can also serve as a source information about lithology. In reservoir rocks VP/VS ratio may also work as a confirmation of gas saturation.
    Źródło:
    Geology, Geophysics and Environment; 2012, 38, 3; 317-327
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of seismic velocity distribution on the depth imaging of the sub-Zechstein horizons in areas affected by salt tectonics: a case study of NW Poland
    Autorzy:
    Pietsch, K.
    Marzec, P.
    Niepsuj, M.
    Krzywiec, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/191765.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    seismic imaging of sub-Zechstein boundaries
    velocity models for Zechstein and Mesozoic successions
    halokinesis
    Mid-Polish Swell
    Opis:
    Lateral changes in the thickness of strata and petrophysical parameters within the Zechstein succession (salt pillows and domes) can cause many problems in seismic exploration of the aeolian Rotliegend formations, which are prospective for hydrocarbons. An assessment of the influence of halokinesis on the seismic imaging of the sub-Zechstein strata in NW Poland (Obrzycko–Szamotuły area, to the SW of the Mid-Polish Swell) utilised time-to-depth conversion with different, seismic-geological models. Various, seismic velocities were used in models for the Zechstein and the Mesozoic successions, namely velocities, dependent on the thickness of particular rock successions, on their depths, and velocities, determined from seismic inversion. The results show opposite reflection patterns for the seismic section imaged in the time and depth domains. The synclinal arrangement of the strata boundaries in the depth model is represented by convex-upwards reflection events on the seismic section. The pull-up of reflection events, associated with the sub-Zechstein strata, observed on the seismic sections, is mainly a result of both the greater thickness of the Zechstein salt within the salt structures (pillows, diapirs) and the increase in velocity contrast between the salt body and the Mesozoic strata.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2012, 82, 3; 263--277
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of 2-D forward seismic modelling for impro- ved imaging of sub-salt Rotliegend strata in Polish Basin
    Autorzy:
    Marzec, P.
    Niepsuj, M.
    Słonka, Ł.
    Pietsch, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/191858.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    salt and subsalt structures
    salt diapirs
    seismic methods
    seismic modelling
    Permian
    Polska
    Opis:
    Forward seismic modelling can aid seismic studies of the pre-Zechstein strata in areas of developed salt tectonics, such as the Obrzycko–Szamotuły region, NW Polish Basin. The results not only can be used for seismic interpretation, but also can support the planning of survey methodology and the workflow of seismic data processing. This paper presents the results of modelling that was carried out, before the acquisition of the regional-scale, seismic line Obrzycko-1–Zabartowo-1–Zabartowo-2 (Górecki, 2010). An interpreted, seismic transect was used to build a basic, seismic-geological model. The modelling was based on seismic ray theory. The zero-offset mo- delling (theoretical wave field) for different geometries of salt structures showed that an increase in salt thickness resulted in a pull-up of reflection events, related to the sub-salt horizons. The incorporation of faults and salt overhangs into a model significantly complicated the seismic wave field. The results of offset modelling, pre- sented in this paper as seismic ray tracing and common-shot gathers, proved that (1) the seismic response of the Rotliegend (Permian) formations can be recorded, despite the presence of the overlying salt pillows and diapirs, if offsets several kilometres long are used, and (2) the complex configuration of seismic reflectors (diapirs with salt overhangs, faults) gives rise to complicated, seismic ray paths that may cause difficulties in common-depth-point stacking and therefore decrease the quality of the seismic records.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2013, 83, 1; 65-80
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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