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| Titel |
The resolution of reservoir dynamics with noise based technologies: A case study from the 2006 Basel injection experiment |
| VerfasserIn |
Gregor Hillers, Stephan Husen, Anne Obermann, Thomas Planes, Michel Campillo, Eric Larose |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093241
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| Publikation (Nr.) |
 EGU/EGU2014-7802.pdf |
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| Zusammenfassung |
| We explore the applicability of noise-based monitoring and imaging techniques in the context
of the 2006 Basel stimulation experiment using data from five borehole velocimeters and five
surface accelerometers located around the injection site. We observe a significant
perturbation of medium properties associated with the reservoir stimulation. The
transient perturbation, with a duration of 20-30 days, reaches its maximum about
15 days after shut in, when microseismic activity has ceased; it is thus associated
with aseismic deformation. Inverting relative velocity change and decorrelation
observations using techniques developed and applied on laboratory and local to regional
seismological scales, we can image the associated deformation pattern. We discuss
limits of the the frequency- and lapse-time dependent resolution and suggestions for
improvements considering the 3-D network geometry together with wave propagation
models. The depth sensitivity of the analyzed wave field indicates resolution of
perturbation in the shallow parts of the sedimentary layer above the stimulated deep
volume located in the crystalline base layer. The deformation pattern is similar to
InSAR/satellite observations associated with CO2 sequestration experiments, and
indicates the transfer of deformation beyond scales associated with the instantaneously
stimulated volume. Our detection and localization of delayed induced shallow aseismic
transient deformation indicates that monitoring the evolution of reservoir properties
using the ambient seismic field provides observables that complement information
obtained with standard microseismic approaches. The results constitute a significant
advance for the resolution of reservoir dynamics; the technology has the potential to
provide critical constraints in related geotechnical situations associated with fluid
injection, fracking, (nuclear) waste management, and carbon capture and storage. |
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