Potencial espontáneo estático (SSP)

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El máximo SP que se puede registrar cuando la sonda en el registro de pozo pasa entre una arena muy gruesa, porosa, permeable y limpia a un punto que se encuentra dentro de una lutita gruesa. El SSP electroquímico (el SP electrocinético es a menudo olvidado) es aproximadamente dado por:

,

where aw is the activity of the formation water and amf that of the mud filtrate. Because of the inverse relationship between activity and equivalent resistivity, this equation can be written:

.

where Rmfe=equivalent mud filtrate resistivity, Rwe= equivalent water resistivity. For NaCl muds that are not too saline, Rmfe=Rmf; for other muds an activity correction should be made. In these equations where T=Fahrenheit temperature. See also SP and pseudostatic SP.