Repository logo

Browsing by Subject "petrophysical models"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Badanie poprawności wybranych wzorów empirycznych do oceny współczynnika filtracji gruntów
    (2010) Twardowski, Kazimierz; Drożdżak, Ryszard
    Results of comparative analyses of correctness of selected analytical formulae for prognosed ground filtration coefficient are presented in the paper. Analyses were made with the use of three model grounds, different as far as their petrophysical properties are concerned. They represented different grounds: sand, sandy clay and silt (according to geotechnical standards) of very different filtration properties (10/-4 to ca. 10/-8 m/s). Qualitative analyses were based on current measurement standards.The analyses are closed with practical recommendations on the correctness of specific analyzed empirical formulae in view of various types of the ground.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Przenikalność dielektryczna ośrodków porowatych - czynniki wpływające na jej zmienność
    (2010) Drożdżak, Ryszard; Twardowski, Kazimierz
    The basic regularities, followed by one of the basic electrical properties of porous media, i.e. electric (dielectric) permittivity, are discussed in the paper. The basic types of electric polarization of dielectrics and changes of its character, depending on the frequency of external electromagnetic field, are presented. Petrophysical models enabling indirect evaluation of relative electric permittivity, frequently called dielectric constant of porous rock media, are presented. It mainly depends on the qualitative and quantitative characteristic of the mineral skeleton (solid phase) of the rock and saturating porous fluids, in that waters having anomalously high dielectric constant.