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Noise-based monitoring and imaging of aseismic transient deformation induced by the 2006 Basel reservoir stimulation

Gregor Hillers, Stephan Husen, Anne Obermann, Thomas Planes, Eric Larose and Michel Campillo
Noise-based monitoring and imaging of aseismic transient deformation induced by the 2006 Basel reservoir stimulation
Geophysics (July 2015) 80 (4): KS51-KS68

Abstract

We have analyzed the time-dependent properties of the ambient seismic wavefield between 0.1 and 8 Hz to detect, resolve, monitor, and image the deformation induced by the water injection associated with the stimulation of the 2006 Deep Heat Mining Project in the city of Basel, Switzerland. The application of passive methods allowed the detection of an aseismic transient of approximately 35 days' duration that began with the onset of the reservoir stimulation. Peak deformation was reached some 15 days after the bleed-off and after the induced seismicity ceased. We resolved a significant increase in seismic velocities and a simultaneous decorrelation of the noise correlation coda waveforms. The wavefield properties implied that the material response was monitored mainly in the sedimentary layer (<2.5 km) above the stimulated volume that was approximately 4.5 km deep. We inverted the velocity-change and decorrelation data to estimate the spatial distribution of the medium changes. The resulting images showed that the strong velocity variations and medium perturbations were generally colocated with the lateral distribution of the induced seismicity. Positive velocity changes and damage around the injection site indicated subsidence, settling, and compaction of the material overlying the stimulated volume. Our results demonstrate that noise-based analysis tools can provide important observables that are complementary to results obtained with standard microseismicity tools. Passive monitoring and imaging have the potential to mature into routinely applied observation techniques that support reservoir management in a variety of geotechnical contexts, such as for mining, fluid injection, hydraulic fracturing, nuclear waste management, and CO (sub 2) storage.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 80
Serial Issue: 4
Title: Noise-based monitoring and imaging of aseismic transient deformation induced by the 2006 Basel reservoir stimulation
Affiliation: Universite Joseph Fourier, Institut des Sciences de la Terre, Grenoble, France
Pages: KS51-KS68
Published: 201507
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 105
Accession Number: 2015-104675
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N45°45'00" - N47°45'00", E05°49'60" - E10°30'00"
Secondary Affiliation: Kantonales Laboratorium Basel, CHE, SwitzerlandEidgenoessische Technische Hochschule Zuerich, CHE, SwitzerlandColorado School of Mines, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201545
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