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Wyświetlanie 1-15 z 33
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:
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:
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 1-15 z 33

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