Modeling of far-field pressure plumes and brine migration for CO2 geological storage
2013 (English)In: Geophysical Research Abstracts, Vol. 15, 2013Conference paper, Abstract (Other academic)
Carbon sequestration in deep saline aquifers involves injection of large volumes of CO2 which causes pressureincrease in the reservoir formations. Recent work shows that the region of pressure increase can reach distancesfrom the injection well that are far beyond the CO2 plume itself. The adverse far-field impacts (e.g., for nearsurfacefresh-water aquifers) of the pressure build-up and brine migration can become a limiting factor for CO2storage capacity. It is therefore needed to carefully examine the evolution and impact of the pressure plume andfar-field brine migration caused by commercial scale CO2 injection under different conditions. Given the largesize of the domains of interest, this poses a challenging modeling and parameter estimation problem, includingissues of parameter upscaling. This study investigates the effect of several factors on the size of the propagatingpressure plume and the magnitude of the pressure build-up. These factors include: (i) formation geometry andboundary conditions; (ii) depth-dependent formation material properties; and (iii) brine leakage through fractureszones and/or faults in the overlying units. For the reservoir formation we consider both generic and site-specificlarge-scale models, the latter based on data from formations in the Baltic Sea region. Numerical simulations forthese large-scale models are conducted using both the full multiphase flow modeling approach and more simplifiedsingle-phase approaches. The simulation results are also discussed in terms of comparison to simple analytical andsemi-analytical solutions.
Place, publisher, year, edition, pages
Geology Geosciences, Multidisciplinary Geophysics
IdentifiersURN: urn:nbn:se:uu:diva-199657OAI: oai:DiVA.org:uu-199657DiVA: diva2:620728
EGU General Assembly 2013