We provide comprehensive integrated solutions for Life-of–Field reservoir monitoring - from feasibility studies, planning and design, through supply and installation of equipment to acquisition, processing and reservoir characterisation.
Where reservoir conditions indicate that frequent monitor surveys would be beneficial, permanently installed systems offer cost savings and enhanced repeatability compared to conventional acquisition.
Multicomponent at Weyburn & Rulison
CGGVeritas participated in the Colorado School of Mines’ Reservoir Characterization Project (RCP) in the processing of 9C 4D multicomponent data from the Weyburn field in Saskatchewan, Canada. A carbon dioxide injection program, using horizontal wells, was initiated to sweep bypassed pay zones in the reservoir and improve production rates.
CGGVeritas also processed the 9C 4D project for RCP at Rulison Field in Colorado, USA. In this multicomponent, time-lapse research project, changes in shear wave anisotropy were related to reservoir pressure depletion in a 'tight-gas' sandstone reservoir.
SeisMovie
SeisMovie is a permanent seismic monitoring solution developed by CGGVeritas in conjunction with Gaz de France and IFP. The system was initially designed for the monitoring of underground gas storage whereby gas is stored in natural subsurface reservoirs.
Using a permanent buried installation ensures excellent 4D repeatability and coupling. By placing the source and sensors below the weathering layer, SeisMovie eliminates near-surface variations to further improve 4D repeatability over extended periods.
Successful pilot studies on the Ekofisk and Snorre fields in 2008, at 70m and 300m water depths, have resulted in a full-scale installation being planned on Ekofisk in 2010. This will be the largest yet permanent installation: 4000 x 4C channels and 200km of seismic cables covering 60 sq km.
Optowave
The Sercel Optowave system consists of fibre optic cables and 4C sensor stations with topside laser interrogation instrumentation. The main advantages of Optowave are:
Subsea components are completely passive, providing greater durability and reliability compared with systems that use electronic or moving-coil sensors
No sub-sea power requirements making this system inherently safer
Precise and stable signals due to uniform ground-station coupling of accelerometers
We provide comprehensive integrated solutions for Life-of–Field reservoir monitoring - from feasibility studies, planning and design, through supply and installation of equipment to acquisition, processing and reservoir characterisation.