A seminar by:  Jonathan Edwards at ENSG, Nancy, room G201

On: Friday, 13th of January, 1:00 pm.

Je vais revenir sur mes travaux de thèse et les organiser de façon logique pour préparer mon manuscrit de thèse et la présentation de ma soutenance.

Je vais d'abord présenter le problème de la corrélation stratigraphique, puis faire un état de l'art. Ensuite, je présenterai quelques règles de corrélation, et je détaillerai ma méthode utilisant un modèle forward comme modèle d'entraînement. Puis, je présenterai une technique pour gérer les ambiguïtés de la corrélation multi-puits en construisant la colonne stratigraphique de la zone d'étude. Enfin, je montrerai quelques résultats.

A seminar by:  Guillaume Caumon at ENSG, Nancy, room G201

On: Friday, 6th of January, 1:00 pm.

Principles of transdimensional inversion and a summary of Jihane Belhadj’s PhD.

A seminar by:  Gabriel Godefroy at ENSG, Nancy, room G201

On: Friday, 2nd of December, 1:00 pm.

Le meeting annuel de la SEG s'est tenu cette année à Dallas, Texas. Au court de ce séminaire, je vous présenterais ce que j'ai appris sur des sujets divers tels que la Full Waveform Inversion, la corrélation sismique puits, le calcul d'attributs sismiques, ou la prise en compte des incertitudes. Le séminaire ne sera pas exhaustif, mais j'essaierais de retranscrire quelque présentations intéressantes.

A seminar by:  Antoine Mazuyer at ENSG, Nancy, room G201

On: Friday, 9th of December, 1:00 pm.

We open the path to the absolute value of the stress by proposing an integrated method to estimate such a value in reservoirs and overburden before oil and gas production. The computed stress is constrained by wellbore data using an inverse approach. Assuming that the mechanical behavior is linear elastic, we perturb the boundary conditions to produce an admissible (i.e. satisfying the equilibrium equations) stress states. Misfit between stress computation and wellbore data minimization is done using CMA-ES, an evolutionary algorithm suitable for ill-conditionned problem. We validate and test the behaviour of our method through a synthetic case. I have worked on this synthetic case the previous months to run very fast inversion using a quadratic mesh with a beautiful mesh !

A seminar by:  Francois Bonneau at ENSG, Nancy, room G201

On: Friday, 25th of November, 1:00 pm. 

The seminar aims at presenting some rules to structure and organize your projects. I will also present some tools designed for project management and collaborative work. I will talk about Bitbucket (a web-based hosting service for projects) and Trello (web-based numerical board for collaboration and communication).

A seminar by:  Antoine Mazuyer and Modeste Irakarama at ENSG, Nancy, room G201

On: Friday, 18th of November, 1:00 pm. 

Today's computers are parallel friendly, allowing us to reduce the amount of time we spend running computations. In this two-part introductory seminar, we will discuss tow different "scales" of parallel computing: (1) parallel computing for small to medium problems that can be achieved on a personal computer, (2) and parallel computing for large problems that usually require a cluster.

The first part, parallel computing on a personal computer, will focus on general purpose GPU (GPGPU) computing. GPGPU is a big part of modern parallel computing, both on personal computers and on clusters. We will present some basic examples to illustrate the efficiency, in terms of execution time, to be expected from GPGPU.

The second part deals with parallel computing on CPU clusters; it will focus on the use of Message Passing Interface (MPI). MPI is a C/C++/Fortran library that is used by nodes (a node can be seen as one computer) to communicate between each other. If you use MPI, parts of your code will be executed at the same time by every node, which requires a particular attention to the distribution of memory. We will use basic examples to illustrate these concepts.

A seminar by: Gabriel Godefroy at ENSG, Nancy, room G201

On: Friday, 7th of October, 1:00 pm. 

Summary: The identification of structural geometries in the vicinity of fault is a difficult challenge in seismic interpretation. In this paper, we propose a quantitative numerical model of fault- related deformation. This model considers localized slip along a fault surface together with a ductile deformation of the strata away from the fault plane. This displacement is described by a compact parameterization able to represent  coalescence of several fault segments. We show how these parameters can be inverted automatically to match horizon picks in the neighborhood of faults.

A seminar by: Thomas Driesner at ENSG, Nancy, room G201.

On: Thursady, 1st of September, 2:00 pm.


Thomas Driesner is Professor at the ETH in Zürich. He is specialized is the modelling of geothermal systems in supercritical conditions and will give a presentation about his research and current projects.

A seminar by: Margaux Raguenel at ENSG, Nancy, room G201

On: Friday, 9th of September, 1:00 pm.

Summary: This presentation will give an overview of the topics presented during the Gordon Research Conference about Flow and Transport in Permeable Media that took place in Gerona in August 2016.