Attenuation is an important measurement for our understanding of rock properties. The extraction of accurate values of attenuation could be useful for enhancing the interpretation of seismic data for reservoir definition. We present here a study using attenuation, velocity and reflectivity from crosswell seismic to optimize imaging of a carbonate reef reservoir in the Michigan Basin. Based on the analysis of traveltimes and average frequencies, we estimate velocity and attenuation coefficient tomograms; combining both tomograms we calculate a Q-value distribution image for wells spaced over 2000 feet. The attenuation coefficient tomogram validates the main features observed in the velocity tomogram, showing high attenuation rates inside the reef. Moreover, the attenuation tomogram shows a better image of the structure and relief of the pinnacle reef, contributing to an interpretation of its possible lateral and depth limits. In summary, the attenuation tomogram is independent information from the crosswell seismic data.


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