 |
| Titel |
Molecular concept and experimental evidence of H2O, CH4 and CO2 adsorption on organic material |
| VerfasserIn |
Yves Gensterblum, Bernhard Krooss, Andreas Busch |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250099372
|
| Publikation (Nr.) |
 EGU/EGU2014-15143.pdf |
|
|
|
|
|
| Zusammenfassung |
| Unconventional gas, such as shale gas or coalbed methane offers an attractive low-carbon
solution and furthermore provides possibilities for CO2-storage and coevally for enhanced
gas recovery. In order to better understand gas and water interaction with organic matter
(coal) of different maturity we developed a molecular concept with experimental and
literature support for sorption of these fluids on organic material over the entire range of
thermal maturity. With increasing burial depth and temperature CO2 and CH4 are the main
volatiles released when organic material matures (cf. coalification). While most CO2 is
generally dissolved in formation water and transported away from the coal, most CH4
(coalbed methane, CBM) remains adsorbed to the coal pore structure and is produced as
unconventional gas.
We present here the experimental basis and a conceptual model and to explain CO2 and
CH4 sorption in the presence of water on coal with varying coal maturity (from lignite to
anthracite). Adsorption experiments have been performed on different maturity coals at
various temperatures, pressures up to 20 MPa and under dry and moist conditions. With
increasing coal maturity we find for both gases a linear sorption capacity trend for
moisture-equilibrated and a more parabolic trend for dry coal samples. When investigating
the difference in CH4 and CO2 sorption capacity on coal of different maturity as a
function of moisture content we infer that oxygen containing functional groups
account for the selective sorption properties of gases and water to coals. Additionally
restrictions in translational and vibrational movements of the sorbed gas molecules
induced by adsorbed water molecules cause differences in the presence of water. |
|
|
|
|
|
|