Feasibility of utilizing wavelet phase to map the CO2 plume at the Ketzin pilot site, Germany
(English)In: Geophysical Prospecting, ISSN 0016-8025, E-ISSN 1365-2478Article in journal (Refereed) In press
Spectral decomposition is a powerful tool that can provide geological details dependentupon discrete frequencies. Complex spectral decomposition using inversionstrategies differs from conventional spectral decomposition methods in that it producesnot only frequency information but also wavelet phase information. Thismethod was applied to a time-lapse three-dimensional seismic dataset in order totest the feasibility of using wavelet phase changes to detect and map injected carbondioxide within the reservoir at the Ketzin carbon dioxide storage site, Germany.Simplified zero-offset forward modelling was used to help verify the effectiveness ofthis technique and to better understand the wavelet phase response from the highlyheterogeneous storage reservoir and carbon dioxide plume. Ambient noise and signalto-noise ratios were calculated from the raw data to determine the extracted waveletphase. Strong noise caused by rainfall and the assumed spatial distribution of sandstonechannels in the reservoir could be correlated with phase anomalies. Qualitativeand quantitative results indicate that the wavelet phase extracted by the complexspectral decomposition technique has great potential as a practical and feasible toolfor carbon dioxide detection at the Ketzin pilot site.
Time-lapse, Signal processing, Inversion, Modelling, Seismic.
IdentifiersURN: urn:nbn:se:uu:diva-300994DOI: 10.1111/1365-2478.12383OAI: oai:DiVA.org:uu-300994DiVA: diva2:953158