[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

Project Home Page
Complete Water Resources Division Software
USGS Home Page
Water Resources Division Home Page
NRP Home Page
Help Page
USGS Privacy Statement        Disclaimer

Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. 

The URL of this page is: http://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/mail/msg00146.html
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1415 since Jan 22, 1998.