1. Petex 2000 Using 3D Prestack Depth Migration to take a new look at a mature area Authors Fiona Dewey Wintershall Noordzee B.V. Malcolm King Monarch Technical Services Phil Whitfield Western Geophysical

2. Petex 2000 Outline  Regional setting  Imaging problems  Velocity model building methodology  Results  Conclusions

3. Petex 2000

4. Buntsandstein Rotliegend Complex Geology  Poor Imaging Time Migration 5 km

5. Petex 2000 Final Velocity Model 40 km

6. Petex 2000 Conclusion Structurally complex areas require detailed velocity models - use multiple model building tools - check model changes on gathers & stacks - close cooperation between processors, interpreters and researchers - 90% solution rather than 70% result Optimal image quality  Reliable structural picture

7. Petex 2000 Wintershall Noordzee B.V. Clyde Petroleum Exploratie B.V. Dyas B.V. Energie Beheer Nederland B.V. Nemid Nederland B.V. Oranje-Nassau Energie PM B. V. Total Oil & Gas Nederland B.V. Veba Oil Nederland B.V. Acknowledgement