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Re: Use of PHREEQC

I think Geochemist's Workbench is probably the most capable model. The only
drawback is that it costs $1000 to $3000.


David Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled

                      Alex Carrillo                                                                           
                      <ambiente@xxxxxxxxx        To:       "David L Parkhurst" <dlpark@xxxxxxxx>              
                      as.unam.mx>                cc:                                                          
In-Reply-To: <>
                                                 Subject:  Re: Use of PHREEQC                                 
                      02/21/03 09:02 AM                                                                       

> >Could PHREEQC be used for modeling petroleum brines (20,000 to 150,000
>My main interest would be in speciation, SI, mixing, forward modeling and
>inverse modeling.
>PHREEQC has an ion-association model, which is limited to the lowest
>concentrations that you mention. The program will make calculations at
>higher concentrations, but I think the aqueous model would be suspect. You
>really need a Pitzer (specific ion interaction) model for the high ionic
>strengths. Geochemist's Workbench, EQ3/6, TEQUIL, SOLMINEQ, and PHRQPITZ
>implement Pitzer models. I maintain PHRQPITZ, but I don't advocate its
>It is old and difficult to run, although I am confident that it does the
>calculations correctly.

Dear David,

Many thanks for your message. I have used PHREEQC for several years in
natural waters and in different ways ( I give a course in UNAM-major
Mexican U¿university). But now the Mexican oil industry (PEMEX) is
interested in the characterization of petroleum brines and their
evolution.  Would you recommend Geochemist{s Workbench?

Thanks again for your help an time

Dr. Alejandro Carrillo-Chávez
Centro de Geociencias-UNAM
Campus Juriquilla,  A.P. 1-742
Queretaro, 76230, Mexico.
Tel: + 52 (01) 442 238-1104 ext 106
Tel: + 52 (01) 555 623-4104 ext 106
Fax: + 52 (01) 442 238-1101
E.mail: ambiente@xxxxxxxxxxxxxxxxxxx
Home page: http://geminis.geociencias.unam.mx/~ambiente/
MSN messenger:  alex_carrilllo58@xxxxxxxxxxx

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