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IRIS Instruments (France)

IRIS Instruments (France)

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6 Projects, page 1 of 2
  • Funder: French National Research Agency (ANR) Project Code: ANR-17-ASTR-0006
    Funder Contribution: 297,311 EUR

    The CAVEM project aims at studying the feasibility of a geophysical prospecting device (at MF and HF bands, 300 kHz-30 MHz) for identifying and characterizing near surface cavities (for civil or military applications). The project purpose is to create new metrological and interpretative solutions for high-resolution electromagnetic prospection. We will consider a wide range of natural and man-made cavities: empty cavity, water-filled karstic channels, empty or metal-equipped tunnels. From a methodological point of view the project aims at demonstrating, through the use of numerical modeling and a proof-of-concept device, that using a wider frequency range including intermediate frequencies (MF-HF bands) would allow better cavity detection and characterization, whatever the cavity type though with a special focus on tunnel types. We will compare the two most-used configurations in geophysical EM measurements: a) fixed transmitter with a mobile receiver and b) mobile transmitter-receiver couple. From the metrological point of view the main objective is to study the feasibility of a wireless connection between the transmitter (Tx) and the receiver (Rx) in order to facilitate in situ data acquisition. This would allow a better field work productivity as well as the possibility of future developments such as data acquisition with unmanned vehicles. Current state-of-the-art low frequency Slingram devices use link cable for synchronization and data-transfer between Tx and Rx. We will study the possibility the replace such a link with a wireless connection at least for data-transfer purpose. Considering the MF-HF band studied in this project, the synchronization between Tx and Rx should achieve sub-nanosecond accuracy. We will also study a way of precise relative positioning of Rx with respect to Tx and will try to achieve a relative positioning with centimeter-level accuracy. Finally we will try to use pitching and rolling angle of both transmitter and receiver loops to apply corrections to the measured EM field. In the third part of this project we will try to apply to cavity and tunnel detection various interpretation strategies used in other EM prospecting applications : a) inversion methods using equivalent sources (dipole or filaments), as used for polymetallic ore deposits characterization in mineral exploration with fixed Tx; b) library-based methods used for identification and classification of UXO with mobile Tx.

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  • Funder: French National Research Agency (ANR) Project Code: ANR-19-CE05-0033
    Funder Contribution: 631,380 EUR

    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.

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  • Funder: French National Research Agency (ANR) Project Code: ANR-17-CE06-0012
    Funder Contribution: 670,025 EUR

    Up to recent time, underground has been investigated mainly for its non-renewable natural resources neglecting its huge potential for storage and geothermal capability. A full energetic transition from traditional hydrocarbon resources to carbon free energy needs smart and safe underground use. In addition to being a source of geothermal energy, the subsurface is a vast 3D space that can be used in a carefully planned way for the management of carbon-free energies through the geological storage of CO2 and various other forms of energy vectors (e.g., H2, heat, compressed air). For a safe and efficient exploitation of all natural resources (e.g., geothermal energy, hydrocarbon, minerals) or underground storage, one critical effort is to identify, characterize, and monitor natural clayey cap rock overlying a target (resource reservoir or storage volume), which plays an essential role in risk reduction (e.g., water table contamination, substances upward leakage) due to their low permeability. Characterization of clayey rocks is thus a key issue in this context. Focusing on this geological formation allows reducing a great part of geotechnologies issues. The identification, characterization, and monitoring of the mineralogy and permeability of the clayey rocks is classically done using boreholes geological, geochemical and geophysical measurements. Despite having a high accuracy, boreholes measurements are invasive and can only bring punctual information at high cost. Surface-based geophysical tools, and especially electrical and electromagnetic (EM) methods (i.e. electric and/or magnetic field measurements), can provide additional information between boreholes at a significantly lower cost and repeatable in time. Interpretation of EM measurements is usually performed using only the direct current (DC) electrical resistivity, which yields to equivalency, sensitivity, and spatial resolution problems. These problems limit the method ability to identify different compartments and therefore generate interpretation difficulties. Using EM measurements and complex resistivity will improve the reliability and accuracy of the interpretation. But, this improvement requires high level of instrumental, theoretical and modeling developments at different scales, in particular for clayey rocks, as these rocks have a typical complex electrical signature associated with their strong surface electrical properties which is function of the clay mineralogy. The main objective of the project is to improve the characterization of the complex and frequency dependence of electrical properties of different clays minerals and mixtures. For that purpose, we intend to closely combine measurements, modeling and inversion tools at different scales (from nano to pluri-m) in parallel to instrumental development. This work will require the development of upscaling procedures, from the mineral/water interface (nano/micrometric) to the field scale (decametric to kilometric). Laboratory experiments using Spectral Induced Polarization (SIP) and multi-scale simulations will be conducted in order to validate the upscaling relationships developed theoretically. These models will be included in an existing inversion code in order to characterize the complex electrical conductivity (chargeability) more precisely after inversion. In parallel, we aim at improving the reliability of EM imaging at depth based on Controlled Source EM (CSEM) by resolving the surface heterogeneities “static” effects which often deteriorates the imaging capabilities deeper. We will develop a new prototype of EM Induction device (EMI) in order to image densely over large zone the shallow earth (from deca to hectometers). This project will help to push further the use of geophysical methods for the characterization of clayey cap rocks.

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  • Funder: French National Research Agency (ANR) Project Code: ANR-22-MIN3-0006
    Funder Contribution: 220,363 EUR
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  • Funder: European Commission Project Code: 212663
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