f NMR Used to Study Pore Sizes in Sand

Data from wireline well logging tools give vital information on the modelling of oil reservoirs. Of particular interest is the nuclear magnetic resonance (NMR) based logging tools because of their potential for giving information regarding oilwater saturations, pore sizes and wettability characteristics of the reservoir (Kenyon et al., 1988). Many fundamental questions regarding what the NMR log is responding to still remgin unresolved. To obtain such information it is of interest to investigate the NMR responses of pure systems with few parameters in order to isolate important basic mechanisms. This must be done under experimentally controlled laboratory conditions. This work aims at studying the relations that exist between relaxation rate and the petrophysical and textural characteristics of some carefully prepared sand packs.