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    Wyświetlanie 1-8 z 8
    Tytuł:
    Attempts to calculate the pseudo-anisotropy of elastic parameters of shales gas formations based on well logging data and their geostatistical analysis
    Autorzy:
    Bała, Maria
    Cichy, Adam
    Wasilewska-Błaszczyk, Monika
    Powiązania:
    https://bibliotekanauki.pl/articles/184744.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    anisotropy parameters
    P and S velocities
    Baltic Basin
    shale gas formations
    acoustic dipole tool
    semivariogram
    Opis:
    This paper presents the attempts to calculate the pseudo-anisotropy of elastic parameters for the Silurian and Ordovician shale formations of several wells located in the Baltic basin. For this purpose, well-logging data were used, in particular data recorded with acoustic dipole tools. With the P and S waves velocities available, measured at the dipole setting in two orthogonal directions XX or YY (SFast and SSlow), the elastic ε and γ parameters were calculated. In this paper we evaluate the effect of different factors e.g., porosity, clay and kerogen content on the velocity of anisotropy shale gas formations. A geostatistical analysis of elastic and reservoir properties was carried out in order to determine the character of the variability of Silurian and Ordovician shale formations in all of the studied wells. Semivariograms for each well characterizing the variation of elastic parameters in the vertical direction were calculated.
    Źródło:
    Geology, Geophysics and Environment; 2019, 45, 1; 5-20
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical analysis of petrophysical parameters of Middle Miocene rocks from the Polish Carpathian Foredeep
    Autorzy:
    Bala, M. J.
    Jarzyna, J. A.
    Mortimer, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060540.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Middle Miocene
    Carpathian Foredeep
    fractal correlation dimension
    statistical analysis
    well logging data
    Opis:
    Sarmatian thin-bedded sandstone and shales have been a subject of statistical studies to differentiate between good and poor reservoir rocks and to show gas-saturated layers in comparison to water-saturated strata. Statistical studies including fractal analysis were performed on well logging data from the Sędziszów 34 borehole drilled in a belt of hydrocarbon deposits that continue below the northern edge of the Carpathian–Stebnik overthrust. Lithological variability and porosity differentiation and changes in water saturation were traced on the basis of the results of well logging interpretation. Basic statistics and histograms of petrophysical parameters have been analysed. A generalized second order fractal correlation dimension was calculated for all parameters and analysed as for a time series. Fractal dimensions did not correlated with the parameters, but good positive correlations between them and the parameters were observed and showed that the curves analysed had the same type of complexity. High correlation coefficients showed pairs of fractal dimensions for those parameters which had similar variability and the same curve roughness. The fractal correlation dimension described the type of complexity of the parameter (curve roughness) and indicated, for example, how shaliness influenced the reservoir properties of the local Middle Miocene. Therefore, the results were also useful in practice, which gave extra information on thin-bedded reservoir rocks.
    Źródło:
    Geological Quarterly; 2012, 56, 4; 665--680
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of stress state based on well logging data and laboratory easurements – a CBM well in the southeastern part of the Upper Silesian Coal Basin (Poland)
    Autorzy:
    Kępiński, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/184365.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Mechanical Earth Model
    Upper Silesian Coal Basin
    stress state
    Opis:
    The main objective of this study is to present calculation methods of horizontal stress profiles, taking into account the stress boundaries model, poro-elastic horizontal strain model and the effective stress ratio approach, using calibration with wellbore failure. The mechanical earth model (MEM) parameters from log measurements and well testing data were estimated for a well located in the southeastern part of the Upper Silesian Coal Basin. Log-derived horizontal stresses of the well are commonly treated as the final product of geomechanical modeling in oil and gas practices. A less popular method for estimating horizontal stresses is based on Kirsch equations juxtaposed with compressional and tensile failure observed on a micro-imager or six-arm caliper. Using this approach, horizontal stresses are determined based on the fact that when hoop stresses exceed the formation’s tensile strength, tensile fractures are created, and when those stresses exceed the compressive strength of the formation, breakouts can be identified. The advantage of this method is that it can be run without in situ stress measurements. The presented workflow is recommended every time there is an image log and dipole sonic measurement in the available dataset, both being necessary to observe the failure zones and MEM.
    Źródło:
    Geology, Geophysics and Environment; 2020, 46, 2; 77-92
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Reservoir properties and fades characterization from core data and well logging: autochthonous Miocene sediments in the Carpathian Foredeep case study
    Autorzy:
    Shouket, A.
    Jarzyna, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/184328.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    porosity
    permeability
    Flow Zone Indicator
    facies
    parasequences
    regression and transgression sedimentary systems
    Opis:
    Laboratory results of total porosity and physical permeability were the basis to calculate Flow Zone Indicator. GR log and porosity log PHI were used for facies identification. Calculations and loggings were performed in the Miocene sandy-shaly sediments in two wells in the Eastern Part of Polish Carpathian Foredeep. FZI increase with the total porosity from the comprehensive interpretation of logs in the regressive set of parasequences was observed. This increase was the result of better reservoir and hydraulic abilities of these parasequences in comparison to transgressive ones. Combining information of laboratory origin with well logging results on the basis of facies and FZI correlation worked also as a kind of data scaling.
    Źródło:
    Geology, Geophysics and Environment; 2014, 40, 4; 331-342
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integration of core, well logging and 2D seismic data to improve a reservoir rock model : a case study of gas accumulation in the NE Polish Carpathian Foredeep
    Autorzy:
    Man, H. Q.
    Jarzyna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059715.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    hydraulic flow units
    reservoir static modelling
    porosity
    permeability
    well logging
    2D seismics
    Opis:
    Geological models play a crucial role in the description and simulation of fluid flow of both hydrocarbon- and water-bearing strata. Methodology, based on the hydraulic flow unit build on the basis of core plug data combined with rock types determined from logs and 3D seismic cubes generated on the basis of 2D seismic sections is presented. It works as a possible exploration tool for the Miocene gas accumulations in the Carpathian Foredeep of Poland. Deterministic and stochastic, geostatistical methods were used to construct a static reservoir model from 2D seismic sections, lithological data and hydraulic flow unit data. A pseudo-3D seismic volume was generated from all of the 2D seismic data available, in order to aid the modelling of hydraulic flow units. This approach is applicable to other reservoirs, where the availability of seismic data is limited. This study demonstrates that even without 3D seismic data and with limited well log data, the proposed hydraulic flow unit approach can be successfully applied to reservoir modelling through the integration of diverse data sets for a wide range of scales.
    Źródło:
    Geological Quarterly; 2013, 57, 2; 289--306
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modifications of methods for the fracture analysis from borehole data in application to shale formations
    Autorzy:
    Bobek, Kinga
    Jarosiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2059592.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    fracture intensity
    joints
    shale complex
    well logging
    boreholes
    Opis:
    Systematic joints play an important role in effective fluid conductivity and in the mechanical response of shale reservoirs to hydraulic fracturing. Specific features of joints, such as their strata-bound aspect, and their attitude, commonly normal to bedding, make it necessary to modify standard methods of their analysis from borehole data. Our study, based on borehole core and microresistivity image logs, is adjusted to typical exploration procedure, with vertical boreholes penetrating subhorizontal beds. This simple configuration makes it possible to measure the true height of most joints. We have used joint height as the weighting parameter for the construction of orientation diagrams and for computation of fracture intensity profiles. We also propose here a method for evaluation of fracture orientation error on directly oriented core, show how to distinguish joints present in the scanner record but absent from the core, and how to apply this kind of data filtering to core/log correlation. We also propose to extend the analysis of mineralized joints by using the type and degree of vein cracking in order to better characterize their susceptibility to hydraulic stimulation. Application of the modified methods revealed a stratification of joint distribution which, in some cases, may not be observed due to the scarcity of joint data from boreholes.
    Źródło:
    Geological Quarterly; 2021, 65, 2; 65: 23
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent improvements in interpretation methodology applied in GeoWin Satun application
    Aktualne udoskonalenia metodyki interpretacyjnej stosowanej w aplikacji Satun systemu GeoWin
    Autorzy:
    Zorski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/183700.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    formacje cienkowarstwowe
    zailenie w geofizyce wiertniczej
    dekonwolucja w geofizyce wiertniczej
    geofizyka wiertnicza
    thin bedded formations
    clay content and log data
    deconvolution of log data
    well logging
    Opis:
    Przedstawiono ostatnio wprowadzone udoskonalenia do aplikacji SATUN systemu interpretacji geofizyki wiertniczej GeoWin. Aplikacja SATUN jest interpretacyjnym narzędziem do analizy cienkowarstwowych utworów piaszczysto-ilastych pod kątem określania nasycenia węglowodorami. Kilkuletnie doświadczenia w stosowaniu aplikacji SATUN w warunkach gazonośnych formacji mioceńskich polskiego przedgórza Karpat skłoniły do wprowadzenia ulepszeń w metodyce. Po pierwsze, stały się dostępne nowe badania laboratoryjne rdzeni obejmujące analizy chemiczne i mineralogiczne, co pozwoliło wprowadzić nowe zależności z regresji wielokrotnej. Badania te potwierdziły wcześniej sygnalizowaną regułę, że przekrój czynny absorpcji neutronów Sigma/a/ma jest w tym regionie ważnym wskaźnikiem zailenia. Bor okazał się głównym pierwiastkiem decydującym o rozkładzie Sigma/a/ma. Po drugie, wprowadzono gęstościowo-neutronowy wykres krzyżowy jako alternatywny sposób określania porowatości i zailenia. Pokazano kompletny przykład polowy zastosowania zmodyfikowanej metodyki w sugerowanej nowej formie graficznej prezentacji wyników.
    Źródło:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2009, 35, 2/1; 549-557
    0138-0974
    Pojawia się w:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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