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CRS Workflow for Improved Seismic Resolution and Monitoring of the Ketzin Storage SiteNormal access

Authors: J. Pruessmann, P. Bergmann, G. Gierse, A. Lippmann and S. Lueth
Event name: 74th EAGE Conference and Exhibition incorporating EUROPEC 2012
Session: Seismic Reservoir Characterisation
Publication date: 04 June 2012
DOI: 10.3997/2214-4609.20148756
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 793.83Kb )
Price: € 20

The Common Reflection Surface, or CRS technique offers a comprehensive workflow for improving seismic processing, imaging, and reservoir characterisation in time and depth, which has been demonstrated in a project of geological CO2 storage at the Ketzin site in Eastern Germany. In applications to the 3D seismic baseline data that was acquired before CO2 injection, the results of the CRS time processing chain are compared to a previous conventional processing. The CRS noise suppression and regularization in the prestack data result in the so-called CRS gathers where acquisition related data gaps and fold variation are compensated for using the lateral event continuation of the CRS method. Both, the data reconstruction and the enhanced prestack signal quality lead to an increased resolution of the subsurface image, and strongly improve the tie to the well data. In the mapping of shallow gas at extremely low fold at this time level, CRS-based AVO resolves a well defined outline and inner structure of the gas zone, and clearly discriminates high-amplitude events outside the gas zone. The CRS technique thus proves to be a versatile tool for improved structural assessment and reservoir monitoring in both, storage and exploration projects.

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