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| Titel |
3D hydro-mechanical scenario analysis to evaluate changes of the recent stress field as a result of geological CO2 storage |
| VerfasserIn |
Fabien Magri, Elena Tillner, Thomas Kempka, Wenqing Wang, Norihiro Watanabe, Günter Zimmermann |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074205
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| Zusammenfassung |
| CO2 storage in deep saline aquifers is one of the strategies used to reduce greenhouse gas
emissions into the atmosphere. However, pressure buildup due to the CO2 injection process
and subsequent pressure dissipation alter the recent stress field in and around the
reservoir. These stress changes may lead to ground uplift, rock fracturing or fault
reactivation. In order to study these phenomena by numerical simulations, flow and
mechanical equations have to be solved together, requiring a hydro-mechanical
coupling.
In the present study, a prospective CO2 storage site located in the Northeast German
Basin serves as 3D geological framework for a numerical evaluation of deformations and in
situ stress changes induced by CO2 injection into the Middle Bunter sandstone. For that
purpose, two open-source simulators are coupled: TOUGH2 (Pruess et al., 1999) is
applied to calculate reservoir pore pressures which are subsequently transferred into
the hydro-geomechanical simulator OpenGeoSys (Wang et al., 2009) to solve the
hydro-mechanical equations.
A scenario analysis was undertaken to evaluate the mechanical effects of CO2 injection
on the reservoir and caprock stability. The results show that under specific assumptions the
vertical movement of the top reservoir is negligible. Furthermore, the changes in the recent
stress field predicted by geomechanical modeling are limited to the surrounding of the
injection well and not significant enough to endanger the mechanical stability of the reservoir
and caprock considering the geological boundary conditions of the study area and the
proposed injection scheme
The presented study demonstrates the hydro-mechanical effects of CO2 storage in a
well-constrained 3D geological regional-scale model based on the characterization of residual
rocks, and can therefore be representative for CO2 storage in the Northeast German
Basin.
References
Pruess, K., C.M. Oldenburg, and G. Moridis, "TOUGH2 User’s Guide, Version 2.0",
Lawrence Berkeley National Laboratory, Berkeley, (1999), pp. 198.
Wang W, Kosakowski G, Kolditz O (2009) A parallel finite element scheme for
thermo-hydro-mechanical (THM) coupled problems in porous media. Comput Geosci
35(8):1631–1641 |
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