Correlação Entre As Distribuições De T2 (Rmn) E Dos Tamanhos De Poros Observados Em Análises De Imagens Petrográficas (Aip)

The relaxation time (T2) distibution curve, from nuclear magnetic resonance (NMR) analysis, is related to pore<br>size distribution within the rock, factor that controls fluids volume that will be produce. Small pores correspond<br>to low T2 values. A cutoff value of T2 is used to distinguish immobile fluid in small pores from mobile fluid in<br>larger pores. T2 cutoff corresponds to a fixed pore size.<br>The petrographic image analysis (PIA) directly provides a pore size distribution curve observed in thin section.<br>In this work, pore size distribution curves obtained from these two methods, NMR and PIA, in sandstone and<br>conglomerate samples was correlated. The surface relaxivity (ρ), constant of proporcionality between PIA pore<br>size distribution and MNR pore size distribution, was calculate to each sample.