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Calculation of pore water resistivity : Petrophysics - Exploration & Production Geology

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Calculation of pore water resistivity 
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Kris_10

Joined: Thu Mar 15, 2012 1:37 pm
Posts: 13
Post Calculation of pore water resistivity
Hi

Does anyone know how to calculate pore water resistivity, based on for example salinity, pressure and temperature? (not with Archies equation)

Kind regards
Mon Aug 13, 2012 8:50 am
kokokyi

Joined: Tue Apr 05, 2011 8:38 am
Posts: 80
Post Re: Calculation of pore water resistivity
Kris_10,

The following is the link to Crain's petrophysical handbook, for the method to compute Rw (formation water resistivity) from salinity (Total Dissolved Solids) and temperature.

http://www.spec2000.net/14-swrw.htm

Rw is dependent mainly on salinity and temperature of the formation water. It is not dependent on pressure. The salinity, i.e. solubility of salts in water, will depend on the temperature and pressure exerted on the solution.

Ko Ko Kyi
Tue Aug 14, 2012 1:57 pm
Kris_10

Joined: Thu Mar 15, 2012 1:37 pm
Posts: 13
Post Re: Calculation of pore water resistivity
Thank you. I also found this one:

ln(Rw) = -0,9487 ln(c) - 0,02479 t + 2,2396

Where c is salinity and t is temperature.
Tue Aug 14, 2012 3:06 pm
Kris_10

Joined: Thu Mar 15, 2012 1:37 pm
Posts: 13
Post Re: Calculation of pore water resistivity
I'm not quite sure about the unit of salinity. If I use ppm I get an unrealistic low resistivity for my well. Does anyone know the equation and the parameter unit of salinity?
Wed Aug 15, 2012 3:15 pm
Kris_10

Joined: Thu Mar 15, 2012 1:37 pm
Posts: 13
Post Re: Calculation of pore water resistivity
The unit was g/l
Wed Aug 29, 2012 1:50 pm
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