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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.

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