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Title

Effects of the initial stress satate on the geomechanical stability of the caprock during CO2 sequestration in deep saline aquifers

AuthorsVilarrasa, Víctor; Olivella, Sebastià; Carrera, Jesús
Issue DateNov-2010
AbstractSuitable saline aquifers should be capped by a low-permeability caprock. This caprock may undergo large pressure buildup because of CO2 injection. This will affect the stress field and may induce large deformations, which can eventually damage the caprock and open up new flow paths. Hydromechanical (HM) simulations capture phenomena that purely hydraulic (H) codes cannot predict. These include the initial pressure drop in the caprock as a response to CO2 injection (Fig. 1) (Vilarrasa et al., 2010). Furthermore, geomechanical behaviour of the rock strongly depends on the initial stress state (Rutqvist et al., 2008). The permeability of the caprock affects fluid pressure evolution, both in the aquifer and the caprock. Brine can leak through relatively permeable caprocks (k ≥10-18 m2), reducing the pressure buildup in the aquifer. In addition, the greater the permeability, the larger the volume of the caprock affected by pressure buildup.
DescriptionColoquio franco-español de CO2. 22-24 noviembre 2010, Pau, Francia.
URIhttp://hdl.handle.net/10261/43240
Appears in Collections:(IDAEA) Comunicaciones congresos
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