Laure Duboeuf

• PhD
• Confirmed Geophysicist at CVA for STORENGY

An experiment of ambient noise based interferometric monitoring of a shallow (∼500m deep) Undeground Gas Storage site showed that it was possible to retrieve Rayleigh wave velocity changes of several percent. The noise sources variability was mitigated by selecting the most stable time intervals prior to stacking the cross-correlation functions ove...

A linearized forward modelling scheme allows to predict effects of reservoir pressure & gas saturation on the Rayleigh wave travel time variations, which are a typical output of passive seismic monitoring. The workflow requires the knowledge of a precise 3D structural model, typically derived from active seismic and well data, in order to build a g...

In this work, we study the induced seismicity recorded during an injection operation at the Muara Laboh geothermal plant (Indonesia). The swarm, consisting of three bursts activating a normal fault zone, is characterized by rapid earthquake (km/day) migration. We use a 2D rate-and-state asperity model to better understand the physical mechanisms co...

Occurrence of seismicity sequences as consequence of fluid injection or extraction has long been studied and documented. Causal relations between injection parameters, such as injection pressure, injection rates, total injected volumes and injectivity, with seismicity derived parameters, such as seismicity rate, cumulative seismic moment, distance...

The combination of seismic analysis with advanced physics-based simulation provides an opportunity to further understand injection-induced fault reactivation, including the hydro-mechanical interplay between different faults and the rock where they reside. Here, this is investigated based on data from hydraulic stimulation of a well at the Reykjane...

The precision of P‐ and S‐wave phase picking strongly determines the precision of earthquake locations, but such picking can be challenging in the case of emergent signals, large datasets, or temporally varying seismic networks. To overcome these challenges, we have developed the concept of an Aggregated Template (AT) to perform automatic picking o...

Fluid injections can trigger seismicity even on faults that are not optimally oriented for reactivation, suggesting either sufficiently large fluid pressure or local stress perturbations. Understanding how stress field may be perturbed during fluid injections is crucial in assessing the risk of induced seismicity and the efficiency of deep fluid st...

The hydraulic stimulation of the well RN-34 at the Reykjanes geothermal field in Iceland caused increased seismic activity near the well. Here, we use this as a case study for investigation on how seismic analysis can be combined with physics-based simulation studies to further understand injection-induced fault reactivation. The work presents new...

Improved engineering decisions in stimulation and operation of geothermal reservoirs are closely related to understanding of subsurface dynamics when different physical processes and the underlying fractured structure of the reservoir strongly interact. Integrated numerical modelling and data interpretation tools that can identify governing mechani...

Identification of reactivated geological structures related to fluid flow is a crucial goal to mitigate damages related to fluid injections in geothermal systems and optimize production. This study focuses on three weeks of seismicity, recorded by a dense surface network of 38 stations in 2015, in the Reykjanes geothermal field (SW of Iceland). We...

The ability to predict the magnitude of an earthquake caused by deep fluid injections is an important factor for assessing the safety of the reservoir storage and the seismic hazard. Here, we propose a new approach to evaluate the seismic energy released during fluid injection by integrating injection parameters, induced aseismic deformation, and t...

Better understanding of how fluid injections reactivate pre-existing fractures and induce seismicity is a concern both for geothermal plants and local populations due to the seismic hazard. A com-bination of seismic data analysis, interpretation and modeling is required to develop a compre-hensive understanding of the processes involved. The main g...

Seismicity induced by fluid perturbations became an important societal concern since felt earthquakes (Mw up to 6) occurred after anthropogenic activities. In order to mitigate the risks associated with undesired seismicity, as well as to be able to use the micro-seismicity as a probe for in-depth investigation of fluid-driven processes, it is of c...

Mieux appréhender la relation entre fluides, sismicité et déformation asismique est crucial en terme de risques et de ressources. Dans les zones d'injections de fluide une augmentation du taux de sismicité est observée, certains événements dépassant Mw=5. Quel est alors le rôle des fluides dans le déclenchement et le contrôle de la sismicité ? Une...

An increase in fluid pressure in faults can trigger seismicity and large aseismic motions. Understanding how fluid and faults interact is an essential goal for seismic hazard and reservoir monitoring, but this key relation remains unclear. We developed an in situ experiment of fluid injections at a 10 meter scale. Water was injected at high pressur...

Subduction of the Cocos plate beneath the Nicoya Peninsula, Costa Rica, generates large underthrusting earthquakes with a recurrence interval of about 50 yrs. The most recent of these events occurred on 5 September 2012 (Mw 7.6). A vigorous sequence of more than 6400 aftershocks was recorded by a local seismic network within the first four months a...