VSP-based Q-estimation at Pike's Peak

Arnim B. Haase, Robert R. Stewart

We estimate seismic attenuation (Q) from VSP data acquired in a 550 m well of the Pike's Peak oilfield, Saskatchewan. The analytical signal method of Q-estimation is compared to two spectral-ratio methods for the 90 m offset VSP data. The three Qestimation methods compare quite well but the role of stratigraphic (apparent) Q in the estimated Q(z) remains unclear. Consistent with previous observations is an increase of estimated Q-values towards shallower depths.