Browsing by Subject "effective relaxivity"
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Item type:Article, Access status: Open Access , Korelacja pomiarów magnetycznego rezonansu jądrowego z badaniami porozymetrii rtęciowej utworów czerwonego spągowca(Wydawnictwa AGH, 2008) Klaja, Jolanta; Kowalska, Sylwia; Przelaskowska, AnnaNuclear Magnetic Resonance and Mercury Porosimetry methods were correlated in order to determine the pore size distribution and the irreducible water content. The investigations were conducted for Rotliegendes sandstones and conglomerates from the Poznań Trough. The transverse relaxation time ($T_2$) distribution curves were calibrated with the use of the Marshall method (in which effective relaxivity is used as the scaling factor - scaling pore radius to $T_2$) in order to determine the pore size distribution. The effective relaxivity value was established for 35 samples, the variability (4.4-49.9 mim/s) of this parameter is connected with the diversity of the pore space structure of the investigated rocks. The cutoff time ($T_{2G}$) value was determined by applying the quantitative results of the porosimetry measurements to the transverse relaxation time ($T_2$) distributions. Good correlation between permeability and dynamic porosity obtained with the use of the experimental $T_{2G}$ values shows that the calculated $T_{2G}$ values are correct.