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High-resolution monitoring of geothermal processes with joint Electrical resistivity, Induced & Spontaneous polarization, Gravimetry and Muon tomography – MEGaMu

High-resolution monitoring of geothermal processes with joint Electrical resistivity, Induced & Spontaneous polarization, Gravimetry and Muon tomography

The objective of this project is focused on innovative instrumental development and strategic approach for assessing and monitoring the hydrothermal system before and during exploitation in a high temperature geothermal fields using a multi-physics approach that can bring spatial information.

Joint analysis of multiple physical parameter to better understand the geothermal processes

In the context of renewable energy development and in particular geothermal energy, the MEGaMu project aims at improving the methods available for the scientists and the industry to better understand the geothermal fields. Indeed, they are complex underground systems which are difficult to measure and to model. A new approach is proposed based on the combination of<br />well-known methods in the geophysics community (direct current, seismic and gravimetric methods) with an emerging method: the muon tomography. The data set for each method will be constrained by the other ones during the analysis phase which will allow to measure the geothermal phenomenon with an unprecedented spatial and time resolution. Moreover, the project also aims at improving the measuring methods to better suit the needs firstly of the scientist studying the geothermal fields and then the industrial exploiting and monitoring it.

While electrical, seismic and gravimetric methods are standard tools for geophysicists, muon tomography is presently subject to an increasing demand of functional imaging and monitoring of mass transfers underground. To quantitatively monitor the mass transfers inside complex geological structures the muon tomography technique will be improved and coupled with DC-methods, seismic monitoring and continuous gravity measurements. The major challenge is to be able to efficiently combine the data from the different methods and to make a joint analysis taking into account the different physical properties that are measured. Indeed, muon tomography and gravimetry are sensitive to the same physical property (density), but electrical and seismic methods are not. However, each method is sensible to the water movement and temperature changes inside the geothermal system, providing cross-correlated data to better constrain the inversion and to be able to build a 3D model of the fluid movements.

TBA

TBA

TBA

In the context of renewable energy development and in particular geothermal energy, the MEGaMu project aims at improving the
methods available for the scientists and the industry to better understand the geothermal fields. Indeed, they are complex
underground systems which are difficult to measure and to model. A new approach is proposed based on the combination of
well-known methods in the geophysics community (direct current, seismic and gravimetric methods) with an emerging method: the
muon tomography. The data set for each method will be constrained by the other ones during the analysis phase which will allow to
measure the geothermal phenomenon with an unprecedented spatial and time resolution. Moreover, the project also aims at
improving the measuring methods to better suit the needs firstly of the scientist studying the geothermal fields and then the
industrial exploiting and monitoring it.

Project coordination

Simon Bouteille (IRIS INSTRUMENTS)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IRIS IRIS INSTRUMENTS
IPGP Institut de physique du globe de Paris
GEOSCIENCES RENNES
IP2I - CNRS INSTITUT DE PHYSIQUE DES 2 INFINIS DE LYON

Help of the ANR 631,379 euros
Beginning and duration of the scientific project: December 2019 - 48 Months

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