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Full Wave Inversion of OVSP Seismic Data for Faults Delineation and Characterization in Granite Context
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 1st Geoscience & Engineering in Energy Transition Conference, Nov 2020, Volume 2020, p.1 - 5
Abstract
We have studied the application of the full-wave inversion method (FWI) to offset vertical seismic profiles (OVSP) in order to detect, delineate and characterize the heterogeneities and the faults in the deep granite geothermal reservoir. We consider the context of Soultz-sous-Forêts geothermal site. The main goal of this study is to evaluate the application of a method already used in the oil&gas industry to geothermal purpose and to assess its capability for the specific goal of fault imaging. After having tuned the FWI to adapt to the specific target of faults, we have studied the impact of the acquisition geometry on the estimated parameter fields, namely, the Pwave and S-wave velocity model and the density model. We have shown that for noise free synthetic data and for fault orthogonal to the propagation plane, the fault signal in the data is sufficient to obtain good inversion results. However, several sources are required to better constrain the inverse problem. We have also studied the sensibility of the FWI for different fault thickness, dip and position as the scattered field depends strongly on these parameters. This study has to be continued by using 3D FWI to assess the fault azimuth effect.