Project2:Layout 2 9/6/09 10:58 Page 1 PRODUCTION/PROCESSING/HANDLING 55


Fig. 2. Ground deformation at Krechba field – three years of injection.


field is related to pressure change at depth, a key parameter in reservoir management. The ability to map the subsidence or uplift patterns, using satellite data, powerfully complements ground-based techniques and enables measurement in areas where access is difficult or expensive. Observation of the spatial patterns of vertical displacement can provide insight into the structural geology of a reservoir by highlighting the location of active faults or fractures. This information can be integrated with other types of data as input to reservoir models and can assist in designing recovery strategies.


This capability is illustrated by examining the behavior of ground movement at the Carbon Capture and Storage project at In Salah, Algeria. PSInSAR has recently proven itself as a powerful


tool in tracking the subsurface migration of CO2. Measurements of well-head samples and 3D seismic techniques have correlated well with PS data in


tracking the CO2 plume. The Krechba field was developed in July 2004


as a part of a joint venture with BP, Sonatrach and


Statoil. Here CO2 is re-injected into the water leg of the Krechba Carboniferous Sandstone gas producing reservoir (about 20m thick) via three horizontal wells at a depth of 1900 metres. Satellite image data acquired since the injection


started in August 2004 and processed with the PSInSAR technique has identified uplift around the injectors, while the production area shows an interesting subsidence pattern. o


Enter 55A or ✔ at www.engineerlive.com/iog


Eng Alessandro Ferretti is with Tele-Rilevamento Europa TRE Srl, Milan, Italy. <www.treuropa.com> Brian Young P. Eng is with TRE Canada Inc, Vancouver, Canada. <www.trecanada.com>


Circle 55 or ✔ at www.engineerlive.com/iog


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