Raw borehole geophone data, taken from a 3-line walkaway vertical seismic profile (VSP) acquired in the Pembina oil field in Alberta, was examined for orientation azimuth consistency. Data were recorded using a 16-level VSP tool placed at three different levels in a deviated well. An algorithm was developed that dealt with the added complexities of a deviated survey. Orientation azimuths, using all three lines, had an average standard deviation of 4.39; consistency was poorest for the mid-level tool position, and best for the shallow-level tool position. Most interestingly, orientation azimuths calculated using sources from Line 1 were, on average, 3.7 higher than Line 2 and 3.0 higher than Line 6. This was judged to be related to geological properties of the area, particularly azimuthal anisotropy.


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