Combination of seismic reflection and constrained resistivity inversion with an application to 4D imaging of the CO2 storage site, Ketzin, Germany

Bergmann, Peter G.; Ivandic, Monika; Norden, Ben; Rücker, Carsten; Kiessling, D.; Schmidt‐Hattenberger, Cornelia; Juhlin, Christopher

doi:10.1190/geo2013-0131.1

Cited by 37 publications

(18 citation statements)

References 45 publications

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“…Recently, Bergmann et al . [] and Benisch et al . [] have reported an improved resolution for ERI monitoring studies, when the ERI inversion was constrained by a priori structural information obtained from seismic data.…”

Section: Geoelectrical Monitoring Methodologymentioning

confidence: 99%

Four‐dimensional imaging of moisture dynamics during landslide reactivation

et al. 2017

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Landslides pose significant risks to communities and infrastructure, and mitigating these risks relies on understanding landslide causes and triggering processes. It has been shown that geophysical surveys can significantly contribute to the characterization of unstable slopes. However, hydrological processes can be temporally and spatially heterogeneous, requiring their related properties to be monitored over time. Geoelectrical monitoring can provide temporal and volumetric distributions of electrical resistivity, which are directly related to moisture content. To date, studies demonstrating this capability have been restricted to 2‐D sections, which are insufficient to capture the full degree of spatial heterogeneity. This study is the first to employ 4‐D (i.e., 3‐D time lapse) resistivity imaging on an active landslide, providing long‐term data (3 years) highlighting the evolution of moisture content prior to landslide reactivation and showing its decline post reactivation. Crucially, the time‐lapse inversion methodology employed here incorporates movements of the electrodes on the unstable surface. Although seasonal characteristics dominate the shallow moisture dynamics during the first 2 years with surficial drying in summer and wetting in winter, in the months preceding reactivation, moisture content increased by more than 45% throughout the slope. This is in agreement with independent data showing a significant rise in piezometric heads and shallow soil moisture contents as a result of prolonged and intense rainfall. Based on these results, remediation measures could be designed and early‐warning systems implemented. Thus, resistivity monitoring that can allow for moving electrodes provides a new means for the effective mitigation of landslide risk.

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Section: Geoelectrical Monitoring Methodologymentioning

confidence: 99%

Four‐dimensional imaging of moisture dynamics during landslide reactivation

et al. 2017

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“…; Bergmann et al . ); and (3) ERT methods appear capable of detecting intrusion of brine into fresh water aquifers, which might occur as a side effect of CO 2 injection (Wagner et al . ).…”

Section: Introductionmentioning

confidence: 99%

Fluid injection monitoring using electrical resistivity tomography — five years of injection at Ketzin, Germany

Bergmann

Schmidt‐Hattenberger

Labitzke

et al. 2016

Geophysical Prospecting

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Between the years 2008 and 2013, approximately 67 kilotons of CO2 have been injected at the Ketzin site, Germany. As part of the geophysical monitoring programme, time‐lapse electrical resistivity tomography has been applied using crosshole and surface‐downhole measurements of electrical resistivity tomography. The data collection of electrical resistivity tomography is partly based on electrodes that are permanently installed in three wells at the site (one injection well and two observation wells). Both types of ERT measurements consistently show the build‐up of a CO2‐related resistivity signature near the injection point. Based on the imaged resistivity changes and a petrophysical model, CO2 saturation levels are estimated. These CO2 saturations are interpreted in conjunction with CO2 saturations inferred from neutron‐gamma loggings. Apart from the CO2–brine substitution response in the observed resistivity changes, significant imprints from the dynamic behaviour of the CO2 in the reservoir are observed.

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“…Based on a structural model (Bergmann et al . ; Huang et al . ) and a velocity model (lower left image), the loci of the reflection points are calculated by 3D ray tracing (right image).…”

Section: Processing and Imagingmentioning

confidence: 99%

“…1), as well as saturation and mass estimations (e.g. Baumann, Henninges and De Lucia 2014;Bergmann et al 2014;Schmidt-Hattenberger et al 2014;Ivandic et al 2015;Lüth et al 2015).…”

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confidence: 99%

Vertical seismic profiling using a daisy‐chained deployment of fibre‐optic cables in four wells simultaneously – Case study at the Ketzin carbon dioxide storage site

Götz

Henninges

Reinsch

2018

Geophysical Prospecting

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The geological storage of carbon dioxide is considered as one of the measures to reduce greenhouse gas emissions and to mitigate global warming. Operators of storage sites are required to demonstrate safe containment and stable behaviour of the storage complex that is achieved by geophysical and geochemical monitoring, combined with reservoir simulations. For site characterization, as well as for imaging the carbon dioxide plume in the reservoir complex and detecting potential leakage, surface and surface‐borehole time‐lapse seismic monitoring surveys are the most widespread and established tools. At the Ketzin pilot site for carbon dioxide storage, permanently installed fibre‐optic cables, initially deployed for distributed temperature sensing, were used as seismic receiver arrays, demonstrating their ability to provide high‐resolution images of the storage formation. A vertical seismic profiling experiment was acquired using 23 source point locations and the daisy‐chained deployment of a fibre‐optic cable in four wells as a receiver array. The data were used to generate a 3D vertical seismic profiling cube, complementing the large‐scale 3D surface seismic measurements by a high resolution image of the reservoir close to the injection well. Stacking long vibro‐sweeps at each source location resulted in vertical seismic profiling shot gathers characterized by a signal‐to‐noise ratio similar to gathers acquired using geophones. A detailed data analysis shows strong dependency of data quality on borehole conditions with significantly better signal‐to‐noise ratio in regions with good coupling conditions.

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Combination of seismic reflection and constrained resistivity inversion with an application to 4D imaging of the CO2 storage site, Ketzin, Germany

Cited by 37 publications

References 45 publications

Four‐dimensional imaging of moisture dynamics during landslide reactivation

Four‐dimensional imaging of moisture dynamics during landslide reactivation

Fluid injection monitoring using electrical resistivity tomography — five years of injection at Ketzin, Germany

Vertical seismic profiling using a daisy‐chained deployment of fibre‐optic cables in four wells simultaneously – Case study at the Ketzin carbon dioxide storage site

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