In November 1997, the CREWES Project with assistance from Boyd Petrosearch Consultants Ltd. and PanCanadian Petroleum Ltd. conducted a high-resolution 3C-2D seismic survey combined with a walkaway VSP in Blackfoot field. This VSP survey was acquired in well BF09-08-23-23W4 by Schlumberger of Canada, using a 5-level 3-component ASI downhole receiver string with 15 m receiver interval and dynamite sources. Ten deep levels from 1425m to 1560m are processed. All procedures in the processing flow are performed in the shot gather domain. A median filter is used to separate downgoing and upgoing wavefields. A deconvolution operator is extracted from the downgoing wave and applied to the upgoing wave. The VSPCDP map ties in quite well with the migrated CMP section from the 2-D surface seismic line which is acquired simultaneously. The VSP AVO gather does not show an obvious amplitude anomaly at the position of target channel.
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