Elastic-wave identification and extraction through array processing: An experimental investigation at the laboratory scale

Cacqueray, Benoit de; Roux, Philippe; Campillo, Míchel; Catheline, Stéfan; Boué, Pierre

doi:10.1016/j.jappgeo.2011.04.005

Cited by 18 publications

(14 citation statements)

References 13 publications

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“…Array-based methods are typically some variation of beamforming (e.g., Levshin and Berteussen, 1979;Zywicki and Rix, 2005;Tanimoto and Prindle, 2007;De Cacqueray et al, 2011). This is the approach we take here, using a "mini-array" method that fits the predicted phase from varying backazimuths to observations from a small subset of stations to find the best-fitting arrival angle.…”

Section: Introductionmentioning

confidence: 99%

Arrival-angle anomalies across the USArray Transportable Array

Foster¹,

Ekström²,

Hjörleifsdóttir³

2014

Earth and Planetary Science Letters

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We construct composite maps of surface-wave arrival-angle anomalies using clustered earthquakes and an array method for measuring wave-front geometry. This results in observations of arrival angles covering the entire footprint of the USArray Transportable Array during 2006-2010. Bands of arrival-angle deviations in the propagation direction indicate the presence of heterogeneous velocity structure both inside and outside of the array. We compare the observed patterns to arrival angles predicted using two global tomographic models, the mantle model S362ANI and the surface-wave-dispersion model GDM52. We use both ray-theory-based prediction methods and measurements on synthetic data calculated using a spectral-element method. Both models and all prediction methods produce similar mean arrival angles and long-wavelength patterns of anomalies which are similar to the observations. Predicted shortwavelength features generally do not agree with the observations. The spectral-element method produces some complexity that is not obtained using the ray-theory-based methods; this predicted complexity is similar in character to the observed patterns, but does not match them.

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Section: Introductionmentioning

confidence: 99%

Arrival-angle anomalies across the USArray Transportable Array

Foster¹,

Ekström²,

Hjörleifsdóttir³

2014

Earth and Planetary Science Letters

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“…If needed, the inverse DBF transformation allows the separated waves to be recovered in the time‐offset domain by applying inverse delays (de Cacqueray et al . ). With repetitive records for all of the source–receiver pairs over a given period, DBF allows the extraction of a set of eigenbeams from each record.…”

Section: The Double‐beamforming Algorithmmentioning

confidence: 97%

“…Note that a series of bottom‐reflected S‐body waves could have been extracted from the data (de Cacqueray et al . ).…”

Section: Laboratory Experimentsmentioning

confidence: 97%

Using slowness and azimuth fluctuations as new observables for four‐dimensional reservoir seismic monitoring

Cacqueray

Roux

Campillo

2015

Geophysical Prospecting

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Four‐dimensional imaging using geophysical data is of increasing interest in the oil and gas industries. While travel‐time and amplitude variations are commonly used to monitor reservoir properties at depth, their interpretation can suffer from a lack of information to decipher the parts played by different parameters. In this context, this study focuses on the slowness and azimuth angle measured at the surface using source and receiver arrays as complementary observables. In the first step, array processing techniques are used to extract both azimuth and incidence angles at the source side (departure angles) and at the receiver side (arrival angles). In the second step, the slowness and angle variations are monitored in a laboratory environment. These new observables are compared with traditional arrival‐time variations when the propagation medium is subject to temperature fluctuations. Finally, field data from a heavy‐oil permanent reservoir monitoring system installed onshore and facing steam injection and temperature variations are investigated. The slowness variations are computed over a period of 152 days. In agreement with Fermat's principle, strong correlations between the slowness and arrival‐time variations are highlighted, as well as good consistency with other techniques and field pressure measurements. Although the temporal variations of slowness and arrival time show the same features, there are still differences that can be considered for further characterization of the physical changes at depth.

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“…Acoustics, non-destructive evaluation, exploration seismic and seismology obviously share common issues that can be addressed simultaneously thanks to the development of innovative measurement devices and laboratory physical experiments (Blum et al, 2011). Laser-based ultrasonic techniques have been providing appropriate tools for studying seismic-wave propagation in near-surface geophysics (Bodet et al, 2005(Bodet et al, , 2009Bretaudeau et al, 2011;Bergamo et al, 2014), exploration seismic (Campman et al, 2004;DeCacqueray et al, 2011) or seismology (van Wijk and Levshin, 2004). Regarding seismic methods, small-scale physical modelling and laser experiments are most of the time performed using homogeneous and consolidated materials.…”

Section: Introductionmentioning

confidence: 99%

Surface-wave Analyses in Unconsolidated Granular Models with Increasing Degrees of Complexity

Bodet

Bergamo²,

Dhemaïed³

et al. 2014

Proceedings

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Using micrometric glass beads, we build small scale physical models with increasing degrees of complexity in order to address theoretical and methodological issues of seismic methods (velocity gradients, lateral variations, pore overpressure, etc.). We simulate seismic records at the surface of the laboratory models thanks to a mechanical source and a laser-Doppler vibrometer. From recorded seismograms, we are able to invert surface-wave dispersion for one or two-dimensional velocity structures. These experiments are for instance used as benchmarks for processing and inversion techniques, enable the validation of numerical methods, or make it possible to study issues related to pore fluids.

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Elastic-wave identification and extraction through array processing: An experimental investigation at the laboratory scale

Cited by 18 publications

References 13 publications

Arrival-angle anomalies across the USArray Transportable Array

Arrival-angle anomalies across the USArray Transportable Array

Using slowness and azimuth fluctuations as new observables for four‐dimensional reservoir seismic monitoring

Surface-wave Analyses in Unconsolidated Granular Models with Increasing Degrees of Complexity

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