Zero offset VSP data processing and attenuation estimates in the Oil Sands.

摘要

Zero offset VSP data is processed from a borehole in Northeastern Alberta drilled though the Oil Sands. The major seismic events in the corridor stacks and synthetic seismograms are associated with the regional unconformity at 160 m and the Wabiskaw gas Member at 120 m. The unconformity is associated with a peak event at 200 ms while the gas sand is associated with a smaller peak event at 165 ms.;The second part of the study is the measurement of the quality factor Q in the Oil Sands using the VSP traces. The technique used is the spectral ratio which consists of fitting a straight line of the logarithm of the ratio of two amplitudes recorded at different depths versus frequency. A weak Q decreasing trend from top to bottom of the reservoir is observed. It is computed Q in the Oil Sands to range from 11.8 +/- 0.9 to 21.9 +/- 2.1.