P307 Characterization of Fractured Reservoirs Using Seismic Wave Attenuation M. Brajanovski* (University of Karlsruhe) T.M. Mueller (University of Karlsruhe) & B. Gurevich (Curtin University) SUMMARY One of the main intrinsic seismic wave dissipation mechanisms is associated with wave-induced flow of the pore fluid. In order to equilibrate pressure viscous fluid moves across the interface. In geologically realistic structures the contrast of length scales and elastic properties between fractures and background material might be very large. For such structures we show that there are three different frequency regimes of attenuation separated by two cross-over frequencies. Estimation of these cross-over frequencies yields


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