Spontaneous potential (SP) of a formation has tight relationship with salinity of formation liquid, the salinity of mud filtrate in invaded zone affects SP log considerably.

自然电位与地层流体的矿化度有密切关系，侵入带中泥浆滤液的矿化度对自然电位测井有较大的影响。

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These spontaneous potential (sp) anomalies show elliptical distribution in the map view. The values of the anomalies increase with the water flow.

测量结果表明，在图域内自然电位异常呈现椭圆形分布，随注水流量增大异常值增大。

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