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Re: Use of PHREEQC

>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 use.
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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