 |
| Titel |
In-situ Down Hole Gas Measurements During Geological Storage of CO2 at Ketzin, Germany |
| VerfasserIn |
M. Zimmer, J. Erzinger, Chr. Kujawa, CO2-SINK Group |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023421
|
|
|
|
|
|
| Zusammenfassung |
| The continuous investigation and direct determination of the gas composition in the
storage horizon during and after the injection of CO2 is needed to understand the
behaviour of CO2, to trace the fate of the injected gas and to critical test the geological
field models. Therefore, we developed and applied a new, innovative geochemical
monitoring tool for the real time and in-situ determination of CO2 and other gases in
the underground and in bore holes. The method uses a phase separating silicone
membrane, permeable for gases, in order to extract gases dissolved in borehole
fluids, water and brines. Argon is used as a carrier gas to conduct the collected gases
through capillaries to the surface. Here, the gas phase is analyzed in real-time with a
portable mass spectrometer for all permanent gases. In addition, gas samples were
collected for more detailed investigations in the laboratory. Down hole extraction and
on-line determination of gases dissolved in brines using this gas membrane sensor
technique was successful applied at the scientific CO2 storage test site in Ketzin,
Germany. The dissolved CO2-concentration in the natural formation water at depth was
quantified and changes in the reservoir gas concentrations of helium, hydrogen, methane
and nitrogen during CO2 injection were continuously monitored. The arrival of
injected krypton tracer gas at the observation well was detected and changes in
hydraulic pressure and temperature were recorded. The breakthrough of CO2 into the
observation well, in 50m distance, was observed after the injection of 531.5t CO2. |
|
|
|
|
|
|