Title
Geomechanical modeling of surface uplift around well KB-502 at the in Salah CO2 storage site
Author
Fokker, P.A.
Orlic, B.
van der Meer, L.G.H.
Geel, C.R.
Publication year
2011
Abstract
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.
Subject
Earth & Environment
PG - Petroleum Geosciences SGE - Sustainable Geo Energy
EELS - Earth, Environmental and Life Sciences
Geosciences
CO2 storage
Fracture orientations
Fracture zone
Geodetic technique
Geological modeling
Geomechanical modeling
History matching
In-line
Injection wells
Pressure history
Reservoir models
Reservoir simulation
Surface deformation
Surface depressions
Surface movement
Tensile fractures
Algorithms
Carbon dioxide
Deformation
Engineering exhibitions
Engineers
Fracture
Geodetic satellites
Injection (oil wells)
Petroleum engineering
Petroleum reservoirs
Tectonics
Water injection
Wells
Petroleum reservoir evaluation
To reference this document use:
http://resolver.tudelft.nl/uuid:fb4df873-8f8a-4c08-9bba-5841f9ce3b85
TNO identifier
435986
ISBN
9781617829666
Source
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011 - Incorporating SPE EUROPEC 2011, 23 May 2011 through 26 May 2011, Vienna, 7, 5380-5384
Series
Society of Petroleum Engineers - 73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011 - Incorporating SPE EUROPEC 2011
Document type
conference paper