Frequency characteristics of seismic reflections returning from reservoirs with fractures and voids are different from those of surrounding rock. These characteristics can be depicted by time-frequency analysis technology. The S-transform is applied to the time-frequency analysis of seismic reflections of reservoirs of carbonate rock with fractures and voids. Moreover, carbonate rock with fractures and voids filled with oil and gas can attenuate the amplitude of seismic waves. We present a method using the differences in seismic reflection time-frequency spectra to estimate relative seismic attenuation in a reservoir of carbonate rock with fractures and voids.
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