Abstract
Low-field (<50 mT) nuclear magnetic resonance (NMR) well-logging measurements are beginning to be used to obtain estimates of oil viscosity in situ. To build an interpretive capability, we made laboratory T 1 and T 2 relaxation measurements on a suite of high-density, high-viscosity crude oils. These measurements were also used to estimate oil viscosity and water fraction from T 1 and T 2 measurements on stable, water-in-oil emulsions. High- density, high-viscosity oils have components that relax faster than can be measured by nuclear magnetic resonance logging tools. This requires corrections to T 2 logging measurements for accurate estimates of oil saturation and porosity.
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