The Céré-la-Ronde underground gas storage reservoir in the Paris Basin, a test site to study and enhance reservoir seismic monitoring, is a water-bearing sandstone reservoir in a faulted anticline structure. Seismic data acquired so far have generated a qualitative interpretation of the location of the gas bubble by studying fluid saturation (Meunier, 1998). However, between 1994 and 1997, two sonic logs showed subtle differences in Vp not explained solely by saturation variations. Changes in pore pressure and stresses also influence reservoir elastic properties. Hence, we used geomechanical modeling to evaluate quantitatively how exploiting the gas reservoir impacts seismic measurements....

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