The permeability and seismic properties of fractured reservoirs are not easily correlated. A part of the problem is that seismic properties are controlled by the elastic properties of the rock grains, the pore-space/crack-space geometry, the connectivity of the pore spaces and any local flow that occurs during the transmission of the seismic signal. Permeability, however, is governed by the pore-space geometry, the effective length and apertures of the cracks as well at the connectivity of the cracks. One way to calibrate the permeability and the seismic is to identify a "sweet spot" within a reservoir where certain simplified assumptions can be made regarding the fracture permeability. Under these ideal conditions, it is possible to correlate the seismic response and the production data using simplifying assumptions. After the calibration is accomplished at the well control, these results can then be used to predict the permeability variations away from the well control using the seismic response and models for the relationship between the permeability and the seismic properties. This approach requires the development of empirical relations between the seismic response and the permeability of the reservoir.

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