The more smaller pore size, the more stronger internal Magnetic field gradient. The nmr porosity is significantly lower.
岩石孔径越小，岩石孔隙内部磁场梯度越强，核磁共振测井计算的孔隙度明显偏低；
Igneous rock with strong magnetic susceptibility, leading to strong internal magnetic field gradient, and to T2 spectrum forward and NMR porosity decrease.
火成岩具有强磁化率，导致火成岩孔隙内部产生强磁场梯度，使火成岩的核磁测井T2谱发生前移、核磁孔隙度减小；
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