Arguably, the cheapest and safest place to store gas is inside a reservoir. Over the years, Gaz de France has developed a unique expertise in this field. A brine-filled reservoir is used to store imported gas during summer and pump it out in winter according to market demand. Monitoring bubble expansion, field pressure, and gas saturation is critical to optimize field management and gas recovery. Several seismic monitoring experiments have been carried out over Céré-la-Ronde test site, with varying degrees of success. The latest attempt uses low-energy stationary seismic sources operating continuously in conjunction with vertical multicomponent receiver antennae. The...

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