IG-2 GRAVITY GRADIENTS FOR DE-RISKING PRESTACK DEPTH MIGRATION Summary 1 E.K. BIEGERT 1 M. TALWANI 2 and D.J. SMIT 3 1 Shell International Exploration and Production Inc. 3737 Bellaire Boulevard Houston TX 77025 USA 2 Rice University 3 Shell U.K. Exploration and Production Subsurface de-risking is presently almost exclusively done by methods using seismic data. Indeed all other data collected at the surface is referred to as 'non-seismic' data expressing this fact. However there are emerging gravity measurement technologies that could fundamentally change the game of subsurface risk management. In a companion paper 1 we discussed how gravity gradiometer data


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