Compensation for normal moveout and transmission coefficients in estimating seismic attenuation (Q) by the analytical signal method are investigated. VSP data and surface data acquired at Husky Energy Inc.'s Ross Lake oilfield, Saskatchewan, are used for this study. Major Q-estimate changes are not observed when compared to results obtained from the analytical signal method without this compensation. The minimum Q-estimate of 24 found in the VSP data at approximately 640 m depth, before compensation was applied, shifts to Q=18 for the case with compensation. An adaptation of the analytical signal method for Q-estimation from surface data shows promise with a surface data model.
View full article as PDF (0.20 Mb)