The analytical signal method is used for seismic attenuation (Q) estimation from VSP data acquired at Husky Energy Inc.'s Ross Lake oilfield, Saskatchewan. Q estimation is conducted on downgoing P-wave and upgoing converted-wave data. The logarithm of the instantaneous-amplitude ratio versus time-increment plot is surprisingly smooth for downgoing P-waves and converted-waves. The resultant estimates are: Qp ~= 43 at 300m depth and Qs ~= 28 at 930m.
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