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    Wyświetlanie 1-33 z 33
    Tytuł:
    Present-day stress profile in the Baltic Basin sedimentary succession constrained by drilling-induced structures : interpretation uncertainties
    Autorzy:
    Piłacik, Alicja
    Jarosiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2058697.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    recent stress profile
    borehole wall stability
    breakouts
    shale geomechanics
    Opis:
    A far-field stress model based on theory of elasticity and utilizing the Mohr-Coulomb criterion is commonly used in the petroleum industry as a reliable method for present-day stress profiling. We have analysed the present-day stress profile in the Lower Paleozoic shale succession of the Baltic Basin (northern Poland), Based on data from a single borehole. Our analyses take into account the vertical transverse isotropy (VTI) of the mechanical properties. Initial modelling of the stress profile showed - despite general agreement concerning the length and location of the modelled and observed breakouts - systematic differences when the profile of these structures is analysed in detail. Analyses carried out for selected segments of the borehole have shown that the mere presence of breakouts affects the interpretation of the mechanical properties, and thus also the stress profile. We have analysed the size of the necessary correction for tectonic strain, to avoid this effect, as well as uncertainty resulting from the failure criteria adopted. The final model, corrected for stress disturbances by breakouts, reveals the strati fication of stress regime, with the dominance of a normal faulting regime, and low values of differential stresses in the shale formations.
    Źródło:
    Geological Quarterly; 2021, 65, 4; 71--88
    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:
    Tectonics of the Wysoka Kamieńska Graben (NW Poland) and implications for fault sealing potential
    Autorzy:
    Bobek, Kinga
    Konieczyńska, Monika
    Jarosiński, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2060117.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    tectonic graben
    salt decoupling level
    underground storage
    fault seal potential
    geological modelling
    Opis:
    Reservoir confinement by faults is important for safe storage of liquid waste or hydrocarbons. Having access to 3D seismic and borehole data, we have interpreted the tectonic setting of the Wysoka Kamieńska Graben (WKG) in the NW part of the Polish Basin and subsequently made an interpretation of the sealing potential of the graben-bounding faults. The formation and development of the graben in the Late Triassic and Early Jurassic was controlled by mechanical decoupling in the salts of the Zechstein Group. The primary tectonic factor triggering the graben origin was dextral strike-slip movement along the regional fault zone in the Paleozoic basement, transtensional accommodation of which in the Zechstein-Mesozoic cover led to development of a horse-tail pattern of grabens. During the Late Cretaceous, the graben underwent minor tectonic inversion. Sealing potential analysis of the graben-bounding faults was performed for the Triassic–Jurassic sequence including juxtaposition seal and fault gouge seal components. Finally, we have focussed our interpretation on the Jurassic sequence where the best reservoirs have been recognized. Our results indicate good to moderate sealing potential of the Hettangian reservoir, poor to moderate sealing of the Pliensbachian reservoir and lack of sealing of the Bajocian reservoir. Hence, the Hettangian reservoir, characterized by large thickness, low clay content and a large regional extent, acts as a potential storage formation, being confined by the graben-bounding faults of the WKG.
    Źródło:
    Geological Quarterly; 2021, 65, 3; 65: 38
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The estimation of CO2 storage potential of a gas-bearing shale succession at the early stage of reservoir characterization : a case study from the Baltic Basin (Poland)
    Autorzy:
    Wójcicki, Adam
    Jarosiński, Marek
    Roman, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2058853.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    carbon dioxide
    storage capacity assessment
    shale gas reservoir
    sorption
    pores
    fractures
    Opis:
    Estimation of the CO2 storage potential of gas-bearing shales in the Lower Paleozoic Baltic Basin is at an early stage of reservoir exploration and production, based on data from one vertical exploration borehole, supplemented with some information from adjacent boreholes. The borehole section examined is 120 m long and comprises three intervals enriched with organic matter separated by organic-poor intervals. In our approach, the storage capacity is represented by: (1) sorption potential of organic matter, (2) open pore space and (3) potential fracture space. The potential for adsorbed CO2 was determined from Langmuir isotherm parameters taken from laboratory measurements and recalculated from CH4 adsorption curves. The pore space capacity was estimated in two ways: by utilizing results of laboratory measurements of dynamic capacity for pores >100 nm and using results of helium porosimetry, the first of these being considered as the most relevant. Due to the low permeability of the shale matrix we have adopted the standard assumption that the CO2 is able to reach effectively only 10% of the theoretical total sorption and pore volume. For hydraulic fracture space, the theoretical maximum opening of vertical fractures in the direction of minimum horizontal stress was considered, decreased by the expected portion of fracturing fluid flowback and by partial fracture closure by burial compaction. The effectiveness of three CO2 storage categories for the individual organic-rich and organic-poor shale units shows an obvious positive correlation of TOC content with the storage efficiency by sorption and within pore space, and a negative correlation with the storage efficiency in hydraulic fractures. It was estimated that sorption, over the maximum storage interval (120 m thick), is responsible for ~76% of total storage capacity, pore space accounts for 13% (for the most relevant porosity model) while the contribution of fractures is about 11%. In the minimum storage interval (35 m thick, including the best quality shales) the estimated proportions of sorption, pore space and fractures in the total storage capacity are 84, 10 and 6% respectively. Finally, the result for the best quality storage interval (35 m thick) was compared with the Marcellus Shale of similar thickness (average ~38 m) and with other options of CO2 storage in Poland. The most organic-rich units in the area studied have a CO2 storage capacity efficiency (i.e. storage capacity per volume unit of shale) only slightly less than average for the Marcellus Shale, because sorption capacity – the dominant component – is comparable in both cases. However, the open pore space capacity in the Marcellus Shale appears to be far higher, even if the potential fracture space calculated for the borehole studied is taken into consideration, probably because the free gas content in the Marcellus Shale is far higher than in the Baltic Basin. CO2 storage in depleted shale gas wells is not a competitive solution compared to storage in saline aquifer structures or in larger hydrocarbon fields.
    Źródło:
    Geological Quarterly; 2021, 65, 1; 3
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unconfined compressive strength of Lower Paleozoic shales from the Baltic Basin (northern Poland)
    Autorzy:
    Wojtowicz, Michał
    Jarosiński, Marek
    Pachytel, Radomir Władysław
    Powiązania:
    https://bibliotekanauki.pl/articles/2059581.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    unconfined compressive strength
    triaxial tests
    empirical equations
    shale reservoir
    Baltic Basin
    Opis:
    Unconfined compressive strength of Lower Paleozoic shales from the Baltic Basin (northern Poland)Unconfined compressive strength (UCS) is one of the crucial parameters for geomechanical modelling of unconventional reservoirs useful for the design of hydraulic stimulation of hydrocarbon production. In spite of a large amount of UCS data collected from the Lower Silurian and Ordovician shale successions of the Baltic Basin (northern Poland), no comprehensive study on this subject has been published so far. Here, we compile the results of 247 single-stage confined compressive strength tests (CCST) provided by our industrial partner from four exploration boreholes. Based on the integration of these results with geophysical logging data, including dipole sonic logs, we derive empirical equations describing the relationship between UCS and Young’s modulus or sonic wave slowness. Considering the strong anisotropy of elastic properties in shales we have introduced different empirical equations for UCSv (vertical) and UCSh (horizontal), respectively perpendicular and parallel to bedding. The formula for UCSh is determined with less accuracy than for UCSv due to scarce laboratory tests with bed-parallel loading. Based on the empirical formula proposed, we have estimated the VTI-type of anisotropy to be in the range of 12–27%, depending on the lithostratigraphic formation. The results of our UCS estimations are compared with the results of multi-stage CCST from the adjacent borehole. Both confined tests yielded similar results for UCSv, with slightly higher values obtained from the multi-stage tests. In turn, a comparison of our solution with the results of true uniaxial compressive strength tests (UCST) for vertical samples from one of the studied boreholes revealed a significant discrepancy. The mean UCS results for shale formations from UCST are several times lower than those evaluated from the single-stage CCST. The usefulness of the results obtained for borehole breakout analysis is discussed.
    Źródło:
    Geological Quarterly; 2021, 65, 2; 65: 33
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of joint sets orientation in the Lower Paleozoic shales exposed in Scania (SW Sweden) and concealed in N Poland : a multi-methodological approach
    Autorzy:
    Olkowicz, Marcin
    Bobek, Kinga
    Jarosiński, Marek
    Pachytel, Radomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2058695.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    joint system
    shale formations
    Baltic Basin
    photogrammetry
    borehole scanner
    Opis:
    The Lower Paleozoic shales of SW Sweden and Eastern Pomerania (Poland) have a common history related to the depositional and tectonic evolution of the Baltic Basin. The major tectonic events are recorded, among others, as joints, which are either exposed in outcrops in SW Sweden or recognised in deep boreholes located in Pomerania. We present a comparison of the regional joint systems recognized by multiple methods in the studied region. In effect of a statistical compilation of measurements, five joint sets (named JS 1 to JS 5) were identified, traceable between Eastern Pomerania and SW Sweden. Our analysis showed a general consistency of joint set orientations, independent of their distance to the Tornquist tectonic zone passing through the study region. Three of the joint sets, JS 1 striking NNE, JS 2 striking WNW, and JS 3 striking NNW, are found to be the most frequent sets, occurring in most sites. Having more constant orientation, the JS 1 and JS 3 served as indicators of possible rotation of the tectonic block or stress field in the region. JS 1 and JS 2 are interpreted as an effect of late Carboniferous stress relaxation after Variscan collision, while JS 3 and the E–W striking JS 4 might be related to the Early Devonian Caledonian compressive stage.
    Źródło:
    Geological Quarterly; 2021, 65, 4; s. 258--275
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neotectonics of Poland: An overview of active faulting
    Autorzy:
    Zuchiewicz, Witold
    Badura, Janusz
    Jarosiński, Marek
    Commission on Neotectonics, Committee for Quaternary Research, Polish Academy of Sciences
    Powiązania:
    https://bibliotekanauki.pl/articles/2026796.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neotectonics
    active faulting
    Polska
    Opis:
    Neo tec tonic stud ies in Po land con cern mainly mani fes ta tions of those tec tonic move ments that have been ac tive in Late Neo gene and Qua ter nary times, as well as geo deti cally meas ured re cent ver ti cal and hori zon tal crus tal mo tions. Among prob lems of par ticu lar in ter est, the fol low ing should be listed: pe rio dic ity of neo tec tonic (mostly Qua ter nary) ac tiv ity, es ti ma tion of the para me tres of the neo tec tonic stress field, am pli tudes and rates of Qua ter nary and re cent move ments, de vel op ment of neo tec tonic troughs and young faults, mu tual re la tion ships among pho to linea ments, geo - logi cal struc tures and re cent seis mic ity, as well as the role of tec tonic re ac ti va tion of fault zones due to hu man ac tiv ity. Neo tec tonic faults in Po land have de vel oped in Neo gene and Qua ter nary times due to re ac ti va tion of La ramian or older struc tures, or in the Qua ter nary due to re ac ti va tion of Neo gene faults. The size of throw of Qua ter nary faults changes from 40–50 m and >100 m in the Sude tes and the Lublin Up land, to sev eral – sev eral tens of me ters in the Car - pa thi ans. The av er age rate of fault ing dur ing Qua ter nary times has been 0.02 to 0.05 mm/yr, what en ables one to in -clude these struc tures into the do mains of in ac tive or low- activity faults. A simi lar con clu sion can be drawn from the re sults of re peated pre cise lev el lings and GPS cam paigns. Strike- slip dis place ments have been pos tu lated for some of these faults. Iso lated faults in Cen tral Po land have shown mid dle Qua ter nary thrust ing of the or der of 40–50 m, and some of the Outer Car pa thian over thrusts tend to re veal young Qua ter nary ac tiv ity, as in di cated, i.a. by con cen tra tions of frac tured peb bles within the thrust zones. Epi sodes of in creased in ten sity of fault ing took place in the early Qua ter - nary, in the Ma zo vian (Hol stein ian) In ter gla cial, and dur ing or shortly af ter the Odra nian (Dren the) gla cial stage. Some of the faults have also been ac tive in Holo cene times. Re cent seis mic ac tiv ity is of ten re lated to strike- slip faults, which in the Car pa thi ans trend ENE–WSW and NE–SW, whereas out side the Car pa thi ans they are ori ented par al lel to the mar gin of the East- European Plat form and the Sudetic Mar ginal Fault. Fu ture in ves ti ga tions should put more em - pha sis on pa laeo seis mo tec tonic phe nom ena and prac ti cal ap pli ca tion of neo tec tonic re search.
    Źródło:
    Studia Quaternaria; 2007, 24; 5-20
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-33 z 33

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