Abstract
The measurement of nuclear magnetic resonance (NMR) porosity is affected by temperature. Without considering the impact of NMR logging tools, this phenomenon is mainly caused by variations in magnetization intensity of the measured system due to temperature fluctuations and difference between the temperature of the porous medium and calibration sample. In this study, the effect of temperature was explained based on the thermodynamic theory, and the rules of NMR porosity responses to temperature changes were identified through core physics experiments. In addition, a method for correcting the influence of temperature on NMR porosity measurement was proposed, and the possible factors that may affect its application were also discussed.
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