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Reservoir Seismic Imaging Using an Elastic Full-wave Inversion Approach Applied to Multi-OVSP Data in the Context of Soultz-sous-Forêts

Abstract : In the present paper, we consider the context of Soultz-sous-Forêts geothermal site (France), revisiting well seismic data acquired in 2007. We will apply a full-wave inversion method on the offset vertical seismic profiles in order to detect or image the heterogeneities and the faults in the granite geothermal reservoir. The main goal of this study is both to evaluate the application of a method already used in the oil&gas industry to geothermal purpose and if successful, to improve the knowledge of the fault network at the reservoir level. We recall that, in a crystalline context, the 3D geometry of the fracture/fault network in the granite around and between the wells is a critical issue in order to well constrain the fluid flow modeling in the reservoir and thus to help optimizing the geothermal production. The proposed full-wave inversion method (FWI) has already been conducted with success on offset VSP data (North Sea gas reservoir). However, such seismic imaging and characterization have been performed essentially in sedimentary contexts. Applying the FWI method to structures like faults in a crystalline environment is a real challenge. A previous study on these OVSP data has shown that waves scattered from the interaction of the incident seismic wave with the main faults is actually recorded at the receivers (3C geophones, P-to-S conversion for instance). Information is then present in the seismic data. The full-wave approach being more accurate than standard seismic processing methods, we expect an improvement of the knowledge of the reservoir structure, and particularly, of the main faults network. In this paper, we develop first the methodology of the FWI. The main features are the multiscale approach using increasing frequency bands and spatial correlations, and that the rheology used to model the seismic wave propagation is realistic and accurate. The physics of seismic wave propagation is then correctly reproduced, allowing to extract more information from the seismic data. In addition, it allows to obtain several field parameters as the P-wave and S-wave velocities and others, depending on the case. As the computation costs are very high due to the accurate seismic fullwave modeling, we could consider a 2.5D seismic wave propagation in the upper part of the model, while in the granite reservoir both field parameters and the propagation are fully 3D.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-03681445
Contributor : Yassine Abdelfettah Connect in order to contact the contributor
Submitted on : Monday, May 30, 2022 - 12:24:09 PM
Last modification on : Wednesday, June 8, 2022 - 3:30:44 AM

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  • HAL Id : hal-03681445, version 1

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Christophe Barnes, Yassine Abdelfettah, Nicolas Cuenot, Eléonore Dalmais, Albert Genter. Reservoir Seismic Imaging Using an Elastic Full-wave Inversion Approach Applied to Multi-OVSP Data in the Context of Soultz-sous-Forêts. Word Geothermal Congress, Apr 2021, Reykjavik, Iceland. ⟨hal-03681445⟩

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