Tomographic study of the seismic velocity at the Soultz-sous-Forêts EGS/HDR site

Charléty, Jean; Cuenot, Nicolas; Dorbath, Catherine; Dorbath, L.

doi:10.1016/j.geothermics.2006.10.002

Cited by 26 publications

(22 citation statements)

References 13 publications

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“…Therefore, spatial changes in elastic wave velocity may reveal fracture-related rock properties (e.g., increase or decrease in fracture density). Temporal changes in wave velocity (Peng and Ben-Zion, 2006) may be used to monitor the progressive formation of fractures over time, e.g., in near-well-bore environments (e.g., Charléty et al, 2006) or from 4D seismic (e.g., Alassi et al, 2010) provided that the wavelength of the seismic signal is sufficiently sensitive to the fracture dimensions. In addition to changes in velocity, a decrease in amplitude (i.e., attenuation) of the reflected or transmitted elastic waves and the coda can also reveal changes in fracture properties (Herriaz and Espinosa, 1987;Snieder et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Experimental identification of the transition from elasticity to inelasticity from ultrasonic attenuation analyses

et al. 2018

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The transition from recoverable elastic to permanent inelastic deformation is marked by the onset of fracturing in the brittle field. Detection of this transition in materials is crucial to predict imminent failure/fracturing. We have used an ultrasonic pulse transmission method to record the change in waveform across this transition during fracturing experiments. The transition from elastic to inelastic deformation coincides with a minimum in ultrasonic attenuation (i.e., maximum wave amplitude). Prior to this attenuation minimum, the existing microfractures close. After this minimum, new microfractures form and attenuation increases until peak stress conditions, at which point, larger fractures form leading to complete sample failure. In our experiments, velocity changes are not sensitive enough to be indicative for the transition from elastic to inelastic deformation. Analysis of attenuation, not velocity, may thus detect imminent failure in materials. Our results may help detect fracturing in borehole casings or the near-wellbore area, or they may help predict imminent release of energy by seismic rupture.

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Section: Introductionmentioning

confidence: 99%

Experimental identification of the transition from elasticity to inelasticity from ultrasonic attenuation analyses

et al. 2018

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“…(2010), especially on the basis of microseismic clouds (Weidler et al . 2002; Charléty et al . 2006; Dorbath et al .…”

Section: Improvement Of the Reservoir Modelmentioning

confidence: 99%

“…2006; Bourouis & Bernard 2007; Dorbath et al . 2009) or velocity anomalies by tomography (Jones 1993; Charléty et al . 2006) allowed researchers to recognize some decametric to kilometric fault zones in the vicinity of the wells.…”

Section: Introductionmentioning

confidence: 99%

3-D mapping of permeable structures affecting a deep granite basement using isotropic 3C VSP data

Place¹,

Sausse

Marthelot³

et al. 2011

Geophysical Journal International

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International audienceThis paper illustrates the efficiency of vertical seismic profiling (VSP) for the investigation of dipping and hydraulically conductive structures affecting a granitic basement covered by sediments. A three-component (3C) VSP data set has been acquired in the GPK1 and EPS1 wells of the Soultz-sous-Foreˆts enhanced geothermal system (EGS) located within the Upper Rhine Graben (URG). Our study focuses on the isotropic processing of profiles acquired with vertical vibrator P and their subsequent interpretation. Mainly P-S converted reflections are identified from the analysis of the 3C records. These P-S conversions occur on steep permeable faults that are positioned in space by traveltime modelling. These faults cut the granite basement in several hectometric-scale blocks, and represent the main fluid paths between the boreholes. These faults are thought to be inherited from late Variscan and Alpine deformation periods, reactivated by the current stress field. When properly processed and interpreted, VSP allow the scale gap between surface and borehole data to be bridged

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“…Detailed interpretation of this test will of necessity be based on the results of earlier injection tests and observed microseismicity (e.g. Charléty et al, 2007;Cuenot et al, 2007), and on the results of fluid/rock chemical reaction studies (André et al, 2007).…”

Section: Current Status Of the Soultz Egs Projectmentioning

confidence: 99%

The deep EGS (Enhanced Geothermal System) project at Soultz-sous-Forêts (Alsace, France)

et al. 2006

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Tomographic study of the seismic velocity at the Soultz-sous-Forêts EGS/HDR site

Cited by 26 publications

References 13 publications

Experimental identification of the transition from elasticity to inelasticity from ultrasonic attenuation analyses

Experimental identification of the transition from elasticity to inelasticity from ultrasonic attenuation analyses

3-D mapping of permeable structures affecting a deep granite basement using isotropic 3C VSP data

The deep EGS (Enhanced Geothermal System) project at Soultz-sous-Forêts (Alsace, France)

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