It has recently become possible to make pulsed nuclear magnetic resonance (NMR) measurem¢nts of subsurface geological formations in situ. The longitudinal relaxation time,Tl, has long been the parameter of greatest interest to petrophysicists. However modeling shows that Tl measurements are not repeatable when NMR logging tools move past bed boundaries. Therefore measurements of the transverse relaxation time, T2, must be relied upon. Unfortunately, reservoir rocks have properties that make T2 measurements difficult to interpret. We discuss the relationship between T1 and T2, and the measurement conditions for which T2 gives meanin,gful petrophysical information.'
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