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International Journal of Geophysics - Volume 2014 2014, Article ID 294717, 15 pages -

Research Article

GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany

Leibniz Institute for Applied Geophysics LIAG, Stilleweg 2, 30655 Hannover, Germany

TU Berlin, Fachgebiet Angewandte Geophysik, Institut für Angewandte Geowissenschaften, Sekr. BH 1-1, Ernst-Reuter-Platz 1, D-10587 Berlin, Germany

Vibrometric Oy, Taipaleentie 127, 01860 Perttula, Finland

Received 28 May 2014; Revised 28 October 2014; Accepted 28 October 2014; Published 14 December 2014

Academic Editor: Joerg Schleicher

Copyright © 2014 Julia Götz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

At the CO2 storage pilot site near the town of Ketzin 35 km west of Berlin, Germany the sandstone reservoir at 630 m–650 m depth is thin and heterogeneous. The time-lapse analysis of zero-offset VSP measurements shows that CO2-induced amplitude changes can be observed on near-well corridor stacks. Further, we investigate whether CO2-induced amplitude changes in the monitoring data can be used to derive geometrical and petrophysical parameters governing the migration of CO2 within a brine saturated sandstone aquifer. 2D seismic-elastic modelling is done to test the processing workflow and to perform a wedge modelling study for estimation of the vertical expansion of the CO2 plume. When using the NRMS error as a measure for the similarity between the modelled and recorded repeat traces, the best match is achieved for a plume thickness of 6-7 m within the reservoir sandstone of 8 m thickness. With band limited impedance inversion a velocity reduction at the top of the reservoir of 30%, influenced by casing reverberations as well as CO2 injection, is found. The relation of seismic amplitude to CO2 saturated layer thickness and CO2-induced changes in P-wave velocities are important parameters for the quantification of the injected CO2 volume.





Autor: Julia Götz, Stefan Lüth, Charlotte M. Krawczyk, and Calin Cosma

Fuente: https://www.hindawi.com/



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