A-10 JOINT APPLICATION OF SURFACE SEISMIC VSP AND LWD DATA FOR OVERPRESSURE ANALYSIS TO OPTIMIZE CASING DEPTH Abstract 1 Accurate prediction of formation pressure is important for safe drilling and can reduce financial risk significantly. The major concerns during drilling in an overpressure environment are adjusting the mud weight to avoid kicks and setting each casing string as deep as possible. Intermediate VSP data were combined with surface seismic data to give a very good prediction of the location of the overpressure zone at offshore well Leyden-1 Carnarvon Basin Western Australia. This prediction was continuously updated using ISONIC real time


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