| 摘要 |
A method of measuring motion properties of nuclei within pore spaces of a porous medium. The method includes applying a static magnetic field to the medium to polarize the nuclei, generating a first magnitude of magnetic field gradient within the pore spaces of the medium, applying a radio frequency magnetic field to excite the nuclei, receiving nuclear magnetic resonance signals from the nuclei, and calculating the motion properties from rates of decay of the amplitude of the nuclear magnetic resonance signals. A preferred embodiment includes applying a static magnetic field having a first amplitude, a second amplitude and an amplitude gradient, applying the radio frequency magnetic field at a first frequency to excite the nuclei within the first static magnetic field amplitude, receiving resonance signals at the first frequency, applying a radio frequency magnetic field at a second frequency to excite the nuclei within the second static magnetic field amplitude, receiving resonance signals at the second frequency, and calculating the motion properties from the difference in rates of decay of the amplitudes of the resonance signals from the first and the second frequencies.
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