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  Design considerations for using Distributed Acoustic Sensing for cross‐well seismics: A case study for CO2storage

Wuestefeld, A., Weinzierl, W. (2020): Design considerations for using Distributed Acoustic Sensing for cross‐well seismics: A case study for CO2storage. - Geophysical Prospecting, 68, 6, 1893-1905.
https://doi.org/10.1111/1365-2478.12965

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Wuestefeld, Andreas1, Autor
Weinzierl, Wolfgang2, Autor              
Affiliations:
1External Organizations, ou_persistent22              
24.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146039              

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 Zusammenfassung: Downhole monitoring with fibre‐optic Distributed Acoustic Sensing (DAS) systems offers unprecedented spatial resolution. At the same time, costs are reduced since repeated wireline surveys can be replaced by the permanent installation of comparatively cheap fibre cables. However, the single component nature of fibre data requires novel approaches when designing a monitoring project such as cross‐well seismics. At the example of the shallow CO2 injection test site in Svelvik, Norway, we model the evolution of velocity changes during CO2 injection based on rock physics theory. Different cross‐well seismic design scenarios are then considered to evaluate the best design and the limits of this method to detect containment breach. We present a series of evaluation tools to compare the effect of different well spacings for cross‐well seismic tomography. In addition to travel‐times, we also consider characteristic amplitude changes along the fibre unique to DAS strain measurements, which might add a constraint to the inversion. We also compare the effect of using helical fibres instead of classical straight fibres. We thus present a toolbox to evaluate and compare different monitoring design options for fibre optic downhole installations for cross‐well monitoring.

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Sprache(n): eng - Englisch
 Datum: 2020-05-202020
 Publikationsstatus: Final veröffentlicht
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 Ort, Verlag, Ausgabe: -
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 Identifikatoren: DOI: 10.1111/1365-2478.12965
GFZPOF: p3 PT5 Georesources
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Titel: Geophysical Prospecting
Genre der Quelle: Zeitschrift, SCI, Scopus
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 68 (6) Artikelnummer: - Start- / Endseite: 1893 - 1905 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals181
Publisher: Wiley