The pressure interpretation mathematical model is established based on the theory of spontaneous potential logging;

从自然电位测井原理出发建立压力解释数学模型；

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So, the investigation depth of spontaneous potential logging is the depth of mud invasion, and relation between spontaneous potential and mud invasion depth may be built.

因此，可以得出自然电位测井的探测深度就是泥浆侵入深度，并可建立自然电位与泥浆侵入深度之间的关系。

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While the electrode potential logging has relatively obvious reflection to those coal and strata thereby makes up for deficiency from other logging electrical property parameters in the mining area.

而电极电位测井方法，对该类煤岩层的反映特征比较明显，从而弥补了该矿区测井电性参数曲线的不足。

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