The following gases, with steam, are invariably present in geothermal discharges from both natural features and wells: CO2, H2S, NH3, N2, H2, CH4. These gases are often collectively referred to as the “non-condensible gases”. Despite the near ubiquitous presence of these speeies, the exploration and evaluation of geothermal systems has traditionally placed greater emphasis on the sampling, analysis and interpretation of water chemistry, with gas chemistry rarely considered in the same detail. The greater care which gas sampling requires, coupled with the variability of gas compositions within a field and the sensitivity of gas equilibria to pressure, vapour-liquid Separation processes and temperature has led to a lack of confidence in the interpretation of gas chemistry relative to water compositions. However, improved analytical procedures and an increasing database of geothermal gas compositions, particularly from well discharges, mean that it is possible to give gas chemistry the detailed consideration it deserves in all phases of the geothermal resource development.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Gas Chemistry
Dr. Keith Nicholson
- Springer Berlin Heidelberg
- Chapter 3