PERFILAJE GEOFÍSICO DE POZOS- potencial espontaneo-2010 (1).pdf

7/25/2019 PERFILAJE GEOFSICO DE POZOS- potencial espontaneo-2010 (1).pdf

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PERFILAJE GEOFSICO DE POZOS

Apunte 3:

Potencial Espontneo (SP)


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CIRCUITO DEL SP

(Rider, M; 1996.)


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POTENCIAL DE DIFUCION EN

MEDIOS POROSOS

(Discriminacin por tamao Ion/Catin)


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Potencial de difusin

(Rider, M; 1996.)


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POTENCIAL DE CONTACTO DELQUIDOS (O DE DIFUSIN)

EL FENOMENO DE SP EN POZOS


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POTENCIAL DE MEMBRANA (O DE

LUTITAS)


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Potencial de lutitas

(Rider, M; 1996.)


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POTENCIAL DE MEMBRANA

Y TRANSPORTE DE IONES


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POTENCIALOELECTROCINETICO



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SP ESTATIC0 (SSP): SUMARIO


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BOREHOLE PHENOMENON


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(Rider, M; 1996.)


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(Rider, M; 1996.)


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Ejemplo de

perfi l de SP

Rmf > Rw


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STATIC SP POTENTIAL


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(Rider, M; 1996.)


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SSP SUMMARY:


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Rw from the SP log

Rw is often known from client information or local knowledge.

The SP can be used to check the value of Rw or to compute itwhen it is unavailable.

It is especially useful when there are variations of connatewater salinity along the borehole

SSP = -K log [ Rmfe / Rwe ]

K is a constant - depending on the temperature.Kc = 61 + 0.133 ToF

Kc = 65 + 0.24 ToC


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(Rider, M; 1996.)


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(Schlumberger; 1987.)


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(Rider, M; 1996.)


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(Doveton, J. H.; 1986.)


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(Doveton, J. H.; 1986.)


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(Doveton, J. H.; 1986.)


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PRACTICAL USES OF SP LOGS

Differentiate potentially porous and permeablereservoir rocks from impermeable shales.

Define bed boundaries.

Give an indication of shaliness (maximum

deflection is clean sand; minimum is shale).

Determine Rw in both salt and fresh muds.

PERFILAJE GEOFÍSICO DE POZOS- potencial espontaneo-2010 (1).pdf

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