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NMR測(cè)量有兩步。第一步是建立儲(chǔ)層流體的凈磁場(chǎng)， 當(dāng)儀器沿井簡(jiǎn)移動(dòng)時(shí)，磁鐵的磁場(chǎng)矢量B。磁化儲(chǔ)層流體中的氫核，產(chǎn)生凈磁場(chǎng)，磁場(chǎng)沿著B。方向，即縱向。在井壁附近區(qū)域(距井壁幾英寸)，B。的大小一般為幾百高斯。B。的大小隨著離磁鐵徑向距離的增加而減小，從而在測(cè)量區(qū)域內(nèi)形成磁場(chǎng)梯度或梯度分布。正如下面討論的，磁場(chǎng)梯度用于識(shí)別儲(chǔ)層流體并描述流體特征。
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