Béatrice Yven

Andra · Research & Development

Accelerated Aging of Embedded Electrical Resistivity Sensor for Monitoring Concrete Structures.

Concrete resistivity measurements strongly depend on the temperature and the water content of the structure. In this paper, a study of the effect of the temperature and saturation degree on electrical resistivity measurement is carried out using an embedded printed circuit board sensor to estimate water content profiles in concrete structures. Resi...

Cet article présente une étude sur le vieillissement accéléré des capteurs de résistivité électrique développés pour le suivi de la teneur en eau des ouvrages en béton réalisés dans la formation argileuse du Callovo-Oxfordien à plus de 500 m de profondeur. L'objectif est de tester la réponse des capteurs dans le cas où la solution interstitielle de...

Underground radioactive waste disposal facilities must be monitored to guarantee their correct and safe exploitation during the early stage of their service life. This will be the case in Cigéo, the french industrial geological disposal facility for high-level and intermediate-level long-lived waste, which must be monitored for the first a hundred...

Desiccation influences the complex conductivity of porous media with disseminated metallic particles. We expand the mechanistic model developed in the previous papers of this series to include the effect of saturation upon the complex conductivity of mixtures of mineral grains, pyrite, and pore water. During desiccation, the salt is assumed to be s...

To prepare the construction and operation of a deep geological disposal facility, the mechanical behaviour of the rock formations has to be well known. One of the studied parameters is the Young’s modulus. A workflow has been developed to estimate static Young’s moduli in claystone and limestone formations on seismic lines. First, the dynamic Young...

In this paper, a new approach to estimate Q factor of geological formations on seismic lines was proposed. The purpose was to evaluate the amplification of ground motion on a site dedicated to store radioactive waste. Attenuation introduced dissipative dispersion which could be measured from the frequency-dependent phase velocity of the VSP down-go...

During the last 25 years, Andra has conducted research in the North-East part of the Paris basin to build a deep geological disposal facility for the most highly radioactive waste in the very long term. We summarize the main steps of site characterization from regional scale to repository scale. Then we present the results of 3D geological modellin...

In France the deep Callovo-Oxfordian (COX) argillaceous formation presents many assets to store high level and long lived intermediate level radioactive wastes. From a mechanical behavior, this formation has good properties to ensure construction and operation of a global waste disposal. Here we propose to go further on this topic by evaluating the...

Introduction In the context of a deep geological repository of high-level radioactive wastes, the French National Radioactive Waste Management Agency (Andra) has conducted, over the past 20 years, an extensive characterization of the Callovo-Oxfordian argillaceous rock in the Eastern Paris Basin. This research has served to demonstrate the feasibil...

The geological exploration of the Meuse/Haute-Marne area began in 1994. Several boreholes were drilled, and the Callovo-Oxfordian argillite, thought to become a potential storage formation, were cored and logged. 2D seismic surveys were completed, as well as geological field observations, and an underground research laboratory was created. A 250 km...

Within its mission to design and build an engineered storage facility for the high level radioactive wastes in the eastern Paris Basin, the French National Radioactive Waste Management Agency (Andra) is conducting innovative and extensive characterization of the Callovo-Oxfordian claystone formation (Cox) and surrounding Middle and Upper Jurassic s...

The research conducted by the French Radioactive Waste Management Agency over the past 20 years has served to demonstrate the feasibility and safety of deep disposal of high-level wastes and intermediate-level long-lived wastes. Today, this research is helping prepare for industrial disposal centre's construction and operation. The Callovo-Oxfordia...

This integrated study provides significant insight into parameters controlling the acoustic and reservoir properties of microporous limestones, improving the knowledge of the relationships among petrophysic and microstructural content. Petrophysical properties measured from laboratory and logging tools (porosity, permeability, electrical conductivi...

Nuclear magnetic resonance (NMR), stable isotope geochemistry of micro-sampled cores, NMR well-logs and 3D modeling are used to investigate the carbonate permeability-porosity heterogeneity along 230 m-thick limestones of the Paris Basin. Despite the global low porosity and permeability of the limestones, two aquifers units with porosity greater th...

We have demonstrated the benefit of geostatistical processing both to quantify the quality of the seismic amplitude (SQI) and to perform depth conversion (Bayesian Kriging). The field example illustrates the potential of the seismic method to model the distribution of density, porosity and hydrogeological properties (specific surface, permeability...

We show how Stochastic (Geostatistics) processing of pre stack seismic data benefits to quantify the quality of the seismic amplitudes. The computation of a Stochastic Quality Index (SQI) specific to the stacking process quantifies the reliability of the stacked amplitude and can be considered as a reliable indicator of the preservation of true amp...

It is usually very difficult to identify and quantify the relative influence of tectonics, eustasy and climate on carbonate system evolution from sedimentary records. In order to improve our understanding of these mechanisms, we have traced for the first time, the evolution of the eastern Paris Basin platform throughout the entire Jurassic period....

Several diagenetic models have been proposed for Middle and Upper Jurassic carbonates of the eastern Paris Basin. The paragenetic sequences are compared in both aquifers to propose a diagenetic model for the Middle and Late Jurassic deposits as a whole. Petrographic (optical and cathodoluminescence microscopy), structural (fracture orientations) an...

Micritic limestones exhibit large variation of (1) sedimentary texture from mudstone to packstone, (2) facies composition and (3) petrophysical properties (porosity, acoustic velocity). Those heterogeneities imply a complex distribution of fluid flow properties and a complex petrophysical signature. In the Eastern Paris Basin, Late Jurassic micriti...

Knowledge about porosity and permeability is essential to evaluate fluid content and to detect fluid flow. We present a procedure which allows to use geophysical data (i.e. full waveform acoustic data and reflection seismic data) for a better understanding of the distribution of the porous and permeable bodies. The methodology is based on laborator...

The French National Agency for Nuclear Waste Management (Andra) has conducted investigation and modelling programs within the project of a deep geological disposal of radioactive waste in the Meuse/Haute-Marne region. The potential host formation for the French high and intermediate level and long lived radioactive waste is a thick Callovian-Oxford...

The French National Radioactive Waste Management Agency (Andra) studies the Callovian-Oxfordian clay formation (COX) as potential host rock for a deep geological repository of radioactive waste. The clay content is the key parameter that controls the porosity, the texture as well as the main thermo-hydro-mechanical-chemical properties of the rocks....

The French National Agency for Nuclear Waste Management (Andra) has conducted investigation and modelling programs within the project of a deep geological disposal of radioactive waste in the Meuse/Haute-Marne region. The potential host formation for the French high and intermediate level and long lived radioactive waste is a thick Callovo-Oxfordia...

The paper demonstrates the benefit of combining time-to-depth conversion of seismic horizons by Bayesien kriging, consistent seismic velocity model and elastic impedance in time for building a geological model in depth. The 3D field example illustrates the potentiel of the proposed depth conversion procedure for estimating a density model in depth....

In the context of a deep geological repository of high-level radioactive wastes, the French National Radioactive Waste Management Agency (Andra) has conducted an extensive characterization of the Callovo-Oxfordian argillaceous rock and surrounding formations in the Eastern Paris Basin. As part of this project, an accurate 3D seismic derived geologi...

Pore space geometry and mineralogy are well known to control transfer properties of rocks. Quantification of porosity and mineral content at large scales (m-km) is thus an important issue to understand and estimate the transfer properties variability in the clay rock formation. In the context of CIGEO project, the 130m thick Callovo-Oxfordian clayr...

In recent years national geoscience organizations have increasingly utilized 3D model data as an output to the stakeholder community. Advances in both software and hardware have led to an increasing use of 3D depictions of geoscience data alongside the standard 2D data formats such as maps and GIS data. By characterizing geoscience data in 3D, know...

This paper details an alternative method to the commonly used geostatistical simulation approaches for uncertainty analysis, which are generally time consuming and do not give access to uncertainties associated to calibration sets. The proposed approach uses a deterministic route to evaluate inversion uncertainties and then propagates them into the...

The texture and porosity of Callovo-Oxfordian argillites, coming from the Meuse/Haute-Marne region, have been studied at different scales using borehole and laboratory measurements to more spot-like qualitative and quantitative analyses and descriptions of minerals and of the porous space. Due to their limitations and to their resolution, each of t...

The volcanic complex of Phlegrean Fields, located northwest of Naples (Italy), has been the site of deep geothermal exploration in the 1980s. Several wells were drilled by an Agip-Enel joint venture, with downhole continuous physical properties acquired in each well. The main purpose of this study is to map and describe the spatial variations of th...