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Characterisation of Deep Hydrothermal Fluids Circulation in the Upper Rhine Graben (France) with Electromagnetic Methods
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 1st Geoscience & Engineering in Energy Transition Conference, Nov 2020, Volume 2020, p.1 - 5
Abstract
In the present paper we present a new combination of 3D Controlled-Source Electromagnetics (CSEM) and Magnetotellurics (MT) adapted to image electrical resistivity of deep granitic fractured reservoirs. This method will be applied in the Upper Rhine Graben to locate and describe accurately the geothermal resource in order to reduce the risk of future Enhanced Geothermal System (EGS) projects planned in this area. Electrical resistivity logs data from Soultz-sous-Forêts and Rittershoffen (Alsace, France) geothermal wells will be used to design an optimal survey, since knowledge of resistivity variation in the sedimentary cover is required to properly image deep fluid circulation with high accuracy. As a first validation step, a 2D field trial run in July 2019 near the geothermal power plants from Soultz-sous-Forêts and Rittershoffen successfully characterized the subsurface targets. The main goal of this study will be a large-scale 3D CSEM/MT acquisition campaign, planned on October 2020 in Northern Alsace, in a context of an actual exploration program.