C-40 INTEGRATED BOREHOLE AND 4C PROCESSING FOR ANISOTROPIC IMAGING SUB-CHALK 1 P. KRISTIANSEN 1 M. AITCHISON 2 T. PROBERT 2 and S. FAIRHEAD 3 1 WesternGeco Schlumberger House Solbraavn 10 N-1372 Asker NORWAY Summary Several 4C datasets have been acquired to address complex structural problems. An ideal workflow for processing these 4C data sets requires a range of wireline log and vertical seismic profiling (VSP) data. In this paper we examine the techniques whereby a limited amount of borehole information is used to build an accurate anisotropic velocity model which is subsequently used in the amplitude and phase preserving processing


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