Cere La Ronde Gas Storage Reservoir—Gaz de France
The experiment: In this case history, the French gas supply company Gaz de France planned to store gas by injection into a water-bearing sandstone reservoir in a faulted anticlinal structure at a depth of about 900m in the Paris Basin. It consists of a combination of sandstone channels of excellent reservoir quality with an average thickness of 20m. An R2 reservoir exists below Rl and is made up of complex communicating channels. Two tops were identified, and wells CE12 and CE112 were drilled for the first gas injections. Such fluid substitution induces a significant change in Vp and density, which suggests that the gas bubble could be detected with seismic data.
Figures & Tables
“This book, prepared for use with the first SEG / EAGE Distinguished Instructor Short Course, discusses Â"time-lapse seismicÂ" and enables geoscientists to assess the value and risk of this new technology. It covers the rationale and driving forces behind time-lapse seismic by examining the limitations of existing methods of tracking fluid flow between wells. It examines those reservoir properties that change with time and what can be observed on seismic data over elapsed time. The repeatability of seismic data and the use of Â"legacyÂ" data sets are discussed, along with a review of the seismic data acquisition schemes and data processing requirements for time-lapse analysis. The rock-physics foundation for data analysis and interpretation options also are described. A selection of industry case histories illustrates many of these points. The reader will gain an understanding of key success factors, key calibration requirements, and key uncertainties of time-lapse seismic in reservoir management.”