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Poststack versus prestack stratigraphic inversion for CO2 monitoring purposes: A case study for the saline aquifer of the Sleipner Field

79th SEG Annual Meeting, October 2009, Houston, TX,USA
Clochard V., Del├ępine N., Labat K. and Ricarte P.

For a decade post-stack stratigraphic inversion has been extended to pre-stack inversion with definite success. The main interest is to optimize elastic parameters such as Pwave and S-wave impedances instead of acoustic impedances only. The aim of our study is to evaluate the efficiency of the pre-stack stratigraphic inversion over the Sleipner saline aquifer, which is used for massive CO2 storage. Another aspect of our work is to compare the potential of our pre-stack and post-stack inversions. In both cases we use the same methodology. Only the model parameterization is different in the optimization problem.

On the one hand the encouraging result of our pre-stack inversion allowed us to compare acoustic and elastic Pwave impedances. On the other hand, we compare the 3D distribution of P- and S-impedances in the CO2 plume, which are crucial attributes for both reservoir characterization and CO2 monitoring.