P048 Modified Reverse-Time Migration Applied to Offset VSP Data Acquired in Area with Complex Geological Conditions D. Neklyudov* (Institute of Petroleum Geology and Geophysics) & I. Borodin (Schlumberger) SUMMARY In this paper we propose a modified Reverse-Time Migration algorithm applied to OVSP data which gives a possibility to reconstruct depth structure image having no knowledge about overburden by using original registered seismograms without their redatuming. Velocity model estimated in some depth interval in vicinity of borehole can be used for migration. Its main feature is approximation of source wavefield in the target area using downgoing wavefield registered in a borehole.


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