Title:

Validation of Hydrochemical Analyses and Gas Concentrations of Deep Geothermal Aquifers

Authors:

Thomas BAUMANN

Key Words:

hydrochemistry, degassing, geochemical modelling, Bavarian Molöasse Basin, Malm aquifer, PhreeqC

Conference:

Stanford Geothermal Workshop

Year:

2016

Session:

Geochemistry

Language:

English

Paper Number:

Baumann

File Size:

495 KB

View File:

Abstract:

Data collected in previous projects indicates that the hydrochemical parameters recorded at surface level are not necessarily a good approximation of the water under reservoir conditions. With increasing temperature and gas loading the pH value is significantly effected by degassing. Thus geochemical calculations based on the measured values at surface level and without taking the individual degassing procedures into account are likely to give false predictions. This restriction partly also applies to depth samples. Here, degassing and changes of the hydrochemical parameters have to be taken into account as soon as the sample is opened in the laboratory to insert e. g. the pH probe. The techniques presented in this study present a reliable and reproducible way to calculate the hydrochemical composition and the gas loading under reservoir conditions. Within the scope of this study, it was also evident, that no geothermal water in the Malm Aquifer in the Bavarian Molasse Basin contained excess CO2. Although all gas analyses contained CO2, this CO2 was stripped from the aqueous solution. The amount stripped from the water depends on the concentration of other gases with lower solubility.


ec2-54-211-203-45.compute-1.amazonaws.com, you have accessed 0 records today.

Press the Back button in your browser, or search again.

Copyright 2016, Stanford Geothermal Program: Readers who download papers from this site should honor the copyright of the original authors and may not copy or distribute the work further without the permission of the original publisher.


Attend the nwxt Stanford Geothermal Workshop, click here for details.

Accessed by: ec2-54-211-203-45.compute-1.amazonaws.com (54.211.203.45)
Accessed: Thursday 28th of March 2024 08:37:03 AM