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Feasibility of utilizing wavelet phase to map the CO 2 plume at the Ketzin pilot site, Germany
Author(s) -
Huang Fei,
Juhlin Christopher,
Han Li,
Sopher Daniel,
Ivandic Monika,
Norden Ben,
Deng Wubing,
Zhang Fengjiao,
Kempka Thomas,
Lüth Stefan
Publication year - 2017
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12383
Subject(s) - wavelet , plume , geology , regional geology , noise (video) , matrix decomposition , environmental science , mineralogy , computer science , meteorology , hydrogeology , geotechnical engineering , telmatology , physics , artificial intelligence , quantum mechanics , image (mathematics) , eigenvalues and eigenvectors
Spectral decomposition is a powerful tool that can provide geological details dependent upon discrete frequencies. Complex spectral decomposition using inversion strategies differs from conventional spectral decomposition methods in that it produces not only frequency information but also wavelet phase information. This method was applied to a time‐lapse three‐dimensional seismic dataset in order to test the feasibility of using wavelet phase changes to detect and map injected carbon dioxide within the reservoir at the Ketzin carbon dioxide storage site, Germany. Simplified zero‐offset forward modelling was used to help verify the effectiveness of this technique and to better understand the wavelet phase response from the highly heterogeneous storage reservoir and carbon dioxide plume. Ambient noise and signal‐to‐noise ratios were calculated from the raw data to determine the extracted wavelet phase. Strong noise caused by rainfall and the assumed spatial distribution of sandstone channels in the reservoir could be correlated with phase anomalies. Qualitative and quantitative results indicate that the wavelet phase extracted by the complex spectral decomposition technique has great potential as a practical and feasible tool for carbon dioxide detection at the Ketzin pilot site.