ABSOLUTE POROSITY AND PORE SIZE DETERMINATION OF PORE TYPES IN MEDIA WITH VARYING PORE SIZES USING NMR

摘要

The longitudinal relaxation times (T1) of water and hydrocarbon inside porous media, such as rock from subsurface formations, behave differently when external magnetic fields vary. A Nuclear Magnetic Relaxation Dispersion (NMRD) profile from Fast Field Cycling Nuclear Magnetic Resonance (FFC-NMR) technique differentiates the type of fluids filling the pores. Different types of pores in a rock sample are filled with different fluids, water and hydrocarbon, and the absolute porosity and the pore size of each type of pores is determined.