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Geomechanical modelling of surface uplift around well KB-502 at the In Salah CO2 storage site

Submitted to EAGE Vienna, 2011.
Fokker, P.A., Orlic, B., Van der Meer, L.G.H. and Geel, C.R.
The injection of CO2 in the InSalah field has caused uplift of the surface, as observed by
satellite geodetic techniques (InSAR). Around one of the wells, KB-502, the uplift shows
anomalous behaviour: a two-lobe pattern develops in the direction of the preferred
fracture orientation. This indicates the tensile opening of a fracture or a fracture zone.
To understand the full behaviour of the reservoir response and the surface movement we
have first performed geological modeling, reservoir simulation and history matching.
This has yielded an acceptable description of the reservoir in terms of pressure history
and CO2 breakthrough times. In the second place we have performed geomechanical
modeling: we have developed an algorithm that models the surface deformation resulting
from tensile fracture opening in a multi-layer subsurface. Both the reservoir model and a
possible tensile opening of a fracture zone were input in a geomechanical analysis to
understand the surface deformation pattern. Our algorithm successfully matched the
global shape of a two-lobe pattern. However, the magnitude of the global surface uplift
could not be made in line with the pressures around the injection well, and the surface
depression above the assumed opening fracture was too narrow in comparison with the
predicted response.
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