An Example of the Near-Borehole Structure Study in the West Siberia Conditions with a Spatial Set of Offset VSPS

The main feature of the offset VSP works, conducted in the Komarinaya area in West Siberia, consisted in using spatial system with 12 shot points, situated in different azimuths and offsets reaching about 1100 m from the wellhead. This allowed verifying the geometry of reflecting boundaries, to plot the structure maps using migrated depth sections and to make conclusions concerning the direction of subsequent drilling.