| Title | Comparison of Reservoir Conditions in High Noncondensible Gas Geothermal Systems |
|---|---|
| Authors | Jill Robinson HAIZLIP, Fusun TUT HAKLIDIR, and Sabodh K.GARG |
| Year | 2013 |
| Conference | Stanford Geothermal Workshop |
| Keywords | carbon dioxide, carbonate rocks, reservoir boiling, hydrothermal mineralogy, |
| Abstract | There are several geothermal systems world-wide which contain >1% noncondensible gas by weight dissolved in the reservoir liquid phase. The gas is predominantly carbon dioxide and has a significant effect on resource development and power generation facility design. These high gas systems occur in reservoirs hosted in both volcanic and sedimentary rocks and at a wide range of initial reservoir temperatures from just over 200C in sedimentary-hosted systems to close to 300C in volcanic based systems. This paper evaluates the similarities and differences between the moderate to high temperature sedimentary-hosted high gas geothermal systems in the Menderes and Gediz Grabens of Turkey and some moderate to high temperature volcanic-hosted high gas geothermal systems in New Zealand and the United States in the following areas: a) hydrogeologic setting, b) reservoir rocks and mineralogy, c) reservoir fluid chemistry, d) initial reservoir conditions, and (where applicable) e) changes in fluid chemistry or reservoir conditions with production. The focus of this comparison is to evaluate the origin of high gas geothermal systems and the evolution of the noncondensible gas concentrations in reservoir fluids with production. |