223 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE 7 Seismic inversion and characterization applied to geothermal energy R. Baillet, T. Chrest, T. Defreminville and E. Masse Introduction Seismic inversion is a method used to obtain models of the subsurface in terms of the elastic properties of rocks, called impedances, using seismic reflection data. Seismic characterization, on the other hand, allows the estimation of the key properties of the reservoir, in 3D, in 2D sections or in map, using, among other possible attributes, seismic inversion outputs. The combination of both disciplines unveils, either in 3D, in 2D sections or as maps, the distribution of key reservoir properties, relative to their matrix, fluid or fracture characteristics, between scarce and irregularly distributed well data. It is therefore crucial either to prospect new areas, in exploration, or to increase the production of an already proven geothermal system. Unlike the direct model which creates a synthetic signal from impedances, seismic inversion, as an inverse problem, consists in iteratively optimizing an impedance model from observed seismic data (Figure 7.1). © EDP Sciences, 2025 DOI: https://doi.org/10.1051/978-2-7598-3752-6.c007
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