Nuclear Magnetic Resonance (NMR) for Pore Size Distribution Analysis in Reservoir Rocks

The nuclear magnetic signal's amplitude is directly related to the fluid content, while its attenuation characteristics reveal the fluid environment. In instances where the bulk relaxation time is sluggish and the surface relaxation is strong, the relaxation time T1 or T2 is directly proportional to S/V (the area of the fluid contact hole wall relative to the fluid volume). By analyzing the relaxation time spectrum, it is possible to obtain a better understanding of the pore size distribution characteristics of the actual core.