This research was initiated as part of a summer internship at BP America by S. de Ridder under the
supervision of Joe Dellinger. The authors would like to thank Ray Abma, Olav Barkved, John
Etgen, Phuong Vu, and Jianhua Yu for helpful discussions and suggestions. We also thank BP
and the partners of the Valhall Field (BP Norge and Hess Norge) for permission to publish this
paper. S. de Ridder would like to acknowledge Biondo Biondi, Jon Claerbout, Bob Clapp and Andre Journel for
fruitful discussions and the sponsors of the Stanford Exploration Project for their financial
support.
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