源距是中子测井仪器的主要参数，它在很大程度上决定测井仪的孔隙度精度、灵敏度、分辨率以及环境因素影响状况。

Source spacing is one of the key parameters of neutron logging tool, by which permeability precision, sensitivity, resolution of the logging tool are determined to a large extent.

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由于其测井响应对地层纵向边界的探测灵敏度比对其他地层参数的大得多，在其资料反演中必须重视地层纵向边界位置的提取和反演精度。

Because the sensitivity of logging response to the layer's boundary is much higher than that to other formation parameters, so how to accurately pick up the layer's boundary is important.

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