Memori seminair

Séminaire interne  

Programme des séminaires

- Jean Cauzid (Université de Lorraine) ''Research on the use of portable tools at GeoRessources'' le lundi 21 mars à 13h15, salle de conférence

- Vassilios Melfos (Université de Thessalonique) ‘’Teconics and metallogenesis in NE Greece’’ le mercredi 23 mars à 13h15, salle de conférence

- Martin Köhler (Beak Consultant) ‘’GoldenEye - Project scope, fieldworks and preliminary results from Bockau exploration site’’ le jeudi 24 mars à 13h15, salle de conférence

- Alexandre Tarantola "Nouveaux projets de formation et de recherche sur les gisements porphyres-épithermaux du NE de la Grèce" ce vendredi 18 mars à 13h00 (salle de conférence).

https://www.ring-team.org/

Abstract: Most of the seismic active regions are localised along plate boundaries, thus spatial distribution of earthquakes is also clustered along these boundaries. Moreover with high accumulation rates (>1cm/y) one can expect the area of the next large earthquakes. These findings aren't true for Stable Continental Region (SCR) like French mainland. In these territories, seismic events seem to be uniformly distributed in space. Furthermore, some observations express a dependency behaviour between SCR earthquakes, as in seismic sequences but over hundreds of years. These findings are taken in account into the Generator of Earthquakes for Barely seismic areas.

In this talk, I briefly review some key machine learning principles and report on some recent work using convolutional networks for the structural interpretation of seismic images.

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9h Sophie Viseur (CEREGE, Aix-Marseille Universite): Extra-terrestrial modeling9h30 Florian Wellmann (RWTH Aachen): Quantification of uncertainties in geological models10h Laetitia Le Pourhiet (Université Pierre et Marie Curie): TBD10h30 Break10h45 Alexandrine Gesret (Mines Paris Tech): Uncertainty estimation by stochastic seismic tomography11h15 Pierre Thore (TBC)11h45 Thomas Bohlen (KIT): Applications of Full Waveform Inversion at different spatial scales

Le Groupe Miroir “Raw Materials”, le CNRS (INSU), et le Ministère de la Transition Ecologique et solidaire sont heureux de vous inviter à un atelier/séminaire autour de l’Economie et des Matières Premières.

Organisation: Michel Cathelineau, Agnès Samper et Isabelle Abildtrup (LabEx ReESSOURCES21) avec le concours de l’ INSU (CRNS) et du MTES.

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Journées techniques organisées par INERIS et GeoRessources sur le thème :

Les défis techniques des mesures de contraintes in situ

22 et 23 novembre 2018

https://osr2g.sciencesconf.org

Moment privilégié de rencontres entre étudiants, chercheurs, sponsors industriels et membres du consortium RING (ex GoCad), ce congrès international est ouvert également aux non-membres.

https://2018ringmeeting.event.univ-lorraine.fr

du 18 au 21 septembre 2018

vendredi 8 juin de 11h30 à 12h30, salle de réunion STEVAL. Sushanta Kumar Sahu présentera "

- A 9h30, Martin Lemay (doctorant au Centre de Geosciences des Mines ParisTech) présentera ses travaux de thèse sur la transposition d'un modèle de système fluviatile méandriforme basé processus aux systèmes turbiditiques (voir résumé ci-dessous).

- A 10h30, Zoltan Sylvester (chercheur au Bureau of Economic Geology) présentera ses travaux de recherche sur la modélisation des systèmes chenalisés sous-marins.

Transposition of a process-based model from meandering fluvial systems to turbidite systems

Martin Lemay

Channelized turbidite systems create among the most important hydrocarbon reservoirs. Yet building realistic turbidite reservoir models is still a challenge. The process-based model Flumy has been firstly developed to simulate the long-term evolution of aggrading meandering fluvial systems in order to build 3D reservoir facies blocks. Here Flumy has been transposed to channelized turbidite systems.

The channel migration linear model of Imran et al. (1999) dedicated to subaqueous flows has been implemented to replace the fluvial one. The whole model has been calibrated taking into account the specificities of the turbidite systems such as channel morphology, avulsion frequency, and aggradation and migration rates.

This calibration and the comparison of the model to natural systems rely on Jobe et al. (2016) indexes which characterize: i) the meander belt geometry, and ii) the channel kinematics. Flumy succeeds in reproducing first-order meander belt architecture as shown by the median ratios meander belt width versus channel width, meander belt thickness versus channel depth, and the deduced stratigraphic mobility number (the ratio between lateral versus vertical channel displacements). Both lateral and downstream channel normalized migrations are around 3.5 times lower than in fluvial systems. All these values are coherent with the observations. In the other hand, the channel trajectory observed on seismic cross sections is not fully reproduced: the local stratigraphic mobility number is divided upward by 3 while the channel aggrades, whereas it should be up to 10. This behavior is explained in the literature by an increasing aggradation rate through time and/or flow stripping at outer bend that decreases lateral migration rate (Peakall et al., 2000). These processes are not currently simulated in Flumy, and need to be implemented.

This study shows that Flumy model reproduces well the first order meander belt geometry which is a first step in order to simulate channelized turbidite reservoirs.

En lien avec les soutenances de thèse de Hélène LEGROS (Sn-W, Chine) et François TURLIN (REE, Canada)Voir le programme complet

A seminar by Modeste Irakarama, Gautier Laurent and Julien Renaudeau 

Le district minier du Laurion (Grèce)Apports conjoints de l'épigraphie, de la géologie et de l'archéologie - Nouvelles approches    A. Tarantola - GeoRessources - Cadre géodynamique, géologique et métallogénique des mines du Laurion    D. Morin - HISCANT - Archéologie minière    H. Lohman + S. Nomicos - Univ. Bochum - Archéologie de surface    C. Flament - Univ. Namur - Epigraphie

- Marta GASPARRINI et Isabelle KOWALEWSKI (IFP Energies Nouvelles): Réduction thermique des sulfates : Du laboratoire à la modélisation de bassin

- Pierre STRZERZYNSKI (Université du Maine) : Relations fluide-fracturation : exemple de la bordure nord du bassin Aquitain

- Éric GAUCHER (Total) : Quelques processus hydrothermaux profonds du piémont pyrénéen

- Pierre CARTIGNY (IPGP) : Mise en évidence de fractionnements isotopiques indépendants de la masse du soufre lors de réactions hétérogènes (gaz/solides)

- Pascal PHILIPPOT (IPGP) : Globally asynchronous sulfur isotope signals require re-definition of the Great Oxidation Event

à 14h : Guillaume BARRE soutiendra sa thèse : 

Rôle de la spéciation du soufre dans les fluides géologiques en contexte orogénique : application aux processus d’oxydo-réduction affectant la Nappe des Gypses (Alpes françaises)

Electromagnetic geophysical methods allow to study the electrical conductivity distribution in the subsurface, and therefore, to infer information on 3-D structures, rock type, porosity, fluid content, fluid composition and temperature. I will present state-of-the art probabilistic and deterministic inversion algorithms that help to make the best of these data, as well as applications in environmental geophysics.

This presentation is a rehearsal for my mid-candidature review. I will present the work I have done for the first part of my PhD, the results obtained and my plans for the continuation.