Borehole seismic monitoring of CO2 storage within a saline aquifer at Ketzin, Germany

Götz, Julia; Giese, Rüdiger; Schmidt‐Hattenberger, Cornelia; Juhlin, Christopher; Cosma, Călin

doi:10.3997/2214-4609.20145283

Cited by 4 publications

(4 citation statements)

References 61 publications

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“…These methods comprise 3D (Juhlin et al, 2007;Ivanova et al, 2012), pseudo (or sparse)-3D , and 2D data acquisitions. Additionally, vertical seismic profilings (VSP), moving source profilings, and crosswell seismic surveys have been performed (Yang et al, 2010;Götz et al, 2011). There are also further studies that focus on the processing and interpretation of these data sets, e.g., for geologic characterization (Yordkayhun et al, 2009;Kazemenei et al, 2009Kazemenei et al, , 2010a or time-lapse imaging Zhang et al, 2012).…”

Section: Ketzin Data Examplementioning

confidence: 98%

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

et al. 2014

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A combination of seismic and geoelectric processing was studied by means of a structurally constrained inversion approach. Structural constraints were interpreted from the seismic data and integrated into the geoelectric inversion through a local regularization, which allowed inverted resistivities to behave discontinuously across defined boundaries. This arranged seismic processing and constrained resistivity inversion in a sequential workflow, making the generic assumption that the petrophysical parameters of both methods change across common lithostructural boundaries. We evaluated the approach using a numerical example and a real data example from the Ketzin CO 2 pilot storage site, Germany. The latter demonstrated the efficiency of this approach for combining 4D seismic and surface-downhole geoelectric data. In consistence with the synthetic example, the constrained resistivity inversions produced clearer delineated images along the boundary between caprock and reservoir formation. Near the CO 2 -flooded reservoir, the seismic and geoelectric time-lapse anomalies correlated well. At some distance to the downhole electrodes, however, the geoelectric images conveyed a notably lower resolution in comparison to the corresponding seismic images. Both methods confirm a northwesterly trend for the CO 2 migration at the Ketzin site, although a rather northerly direction was initially expected. The results demonstrate the relevance of the presented approach for the combination of both methods for integrated geophysical CO 2 storage monitoring.

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Section: Ketzin Data Examplementioning

confidence: 98%

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

et al. 2014

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“…), moving source profiling (MSP, downhole acquisition of dense shot profiles on the surface using sparse downhole receivers; Yang et al . ), offset and zero‐offset vertical seismic profiling (VSP) (Götz ; Götz et al . ) and cross‐hole seismic surveys (Zhang et al .…”

Section: Introductionmentioning

confidence: 99%

“…1; 61 kt of CO 2 injected, Ivandic et al 2015) and 2015 (2 years after injection closure). Besides the 3D seismic, 2D (pseudo 3D) seismic (Ivandic et al 2012), moving source profiling (MSP, downhole acquisition of dense shot profiles on the surface using sparse downhole receivers; Yang et al 2010), offset and zero-offset vertical seismic profiling (VSP) (Götz 2014;Götz et al 2014) and cross-hole seismic surveys (Zhang et al 2012) were acquired.…”

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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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“…Therefore, a broad range of seismic methods was performed, including 3D surveys (Juhlin et al, 2007;Ivanova et al, 2012), sparse 3D surveys , 2D surveys , crosswell surveys, and moving source profilings (Yang et al, 2010, Götz, 2013). We will focus on the repeated 3D seismic surveys.…”

Section: Ketzin 4d Seismic Data Setmentioning

confidence: 99%

Time-lapse difference static correction using prestack crosscorrelations: 4D seismic image enhancement case from Ketzin

et al. 2014

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A method for static correction of time-lapse differences in reflection arrival times of time-lapse prestack seismic data is presented. These arrival-time differences are typically caused by changes in the near-surface velocities between the acquisitions and had a detrimental impact on time-lapse seismic imaging. Trace-to-trace time shifts of the data sets from different vintages are determined by crosscorrelations. The time shifts are decomposed in a surface-consistent manner, which yields static corrections that tie the repeat data to the baseline data. Hence, this approach implies that new refraction static corrections for the repeat data sets are unnecessary. The approach is demonstrated on a 4D seismic data set from the Ketzin CO 2 pilot storage site, Germany, and is compared with the result of an initial processing that was based on separate refraction static corrections. It is shown that the time-lapse difference static correction approach reduces 4D noise more effectively than separate refraction static corrections and is significantly less labor intensive.

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Borehole seismic monitoring of CO2 storage within a saline aquifer at Ketzin, Germany

Abstract: This thesis is about borehole seismic monitoring of CO 2

Cited by 4 publications

References 61 publications

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

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

Time-lapse difference static correction using prestack crosscorrelations: 4D seismic image enhancement case from Ketzin

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