>Could PHREEQC be used for modeling petroleum brines (20,000 to 150,000 ppm)? 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. David 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
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:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1840 since Jan 22, 1998.