Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site
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....
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Hindawi Limited
2014-01-01
|
Series: | International Journal of Geophysics |
Online Access: | http://dx.doi.org/10.1155/2014/294717 |
id |
doaj-888018782ec34c3aa75bbfcd824c60ef |
---|---|
record_format |
Article |
spelling |
doaj-888018782ec34c3aa75bbfcd824c60ef2020-11-24T21:00:04ZengHindawi LimitedInternational Journal of Geophysics1687-885X1687-88682014-01-01201410.1155/2014/294717294717Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot SiteJulia Götz0Stefan Lüth1Charlotte M. Krawczyk2Calin Cosma3GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, GermanyGFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, GermanyLeibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hannover, GermanyVibrometric Oy, Taipaleentie 127, 01860 Perttula, FinlandAt 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.http://dx.doi.org/10.1155/2014/294717 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Julia Götz Stefan Lüth Charlotte M. Krawczyk Calin Cosma |
spellingShingle |
Julia Götz Stefan Lüth Charlotte M. Krawczyk Calin Cosma Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site International Journal of Geophysics |
author_facet |
Julia Götz Stefan Lüth Charlotte M. Krawczyk Calin Cosma |
author_sort |
Julia Götz |
title |
Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site |
title_short |
Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site |
title_full |
Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site |
title_fullStr |
Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site |
title_full_unstemmed |
Zero-Offset VSP Monitoring of CO2 Storage: Impedance Inversion and Wedge Modelling at the Ketzin Pilot Site |
title_sort |
zero-offset vsp monitoring of co2 storage: impedance inversion and wedge modelling at the ketzin pilot site |
publisher |
Hindawi Limited |
series |
International Journal of Geophysics |
issn |
1687-885X 1687-8868 |
publishDate |
2014-01-01 |
description |
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. |
url |
http://dx.doi.org/10.1155/2014/294717 |
work_keys_str_mv |
AT juliagotz zerooffsetvspmonitoringofco2storageimpedanceinversionandwedgemodellingattheketzinpilotsite AT stefanluth zerooffsetvspmonitoringofco2storageimpedanceinversionandwedgemodellingattheketzinpilotsite AT charlottemkrawczyk zerooffsetvspmonitoringofco2storageimpedanceinversionandwedgemodellingattheketzinpilotsite AT calincosma zerooffsetvspmonitoringofco2storageimpedanceinversionandwedgemodellingattheketzinpilotsite |
_version_ |
1716780454420414464 |