Research for Integrative Numerical Geology

Speaker(s): Melchior Schuh-Senlis

Date: Friday 25th of May 2018

Location: room G201, ENSG, Nancy

Abstract:

Le but est ici de présenter l'avancement actuel de mes recherches bibliographiques pour ma thèse, et les implications des différentes informations que j'ai réunies sur le reste de ma thèse. Ce séminaire a également pour but de discuter des différentes méthodes pouvant être utilisées et des différents moyens de les approcher durant ma thèse. Je parlerais pour cela de mes recherches sur les méthodes ALE (Arbitrary Lagrangian Eulerian) et PIC (Particle-In-Cell), sur leur utilisation actuelle sur des problématiques de tectonique salifère, et sur la possibilité de les adapter pour faire de la modélisation de failles et de la restauration géomécanique de modèles géologiques.

Speaker(s): Antoine Mazuyer

Date: Friday 27th of April 2018

Location: room G201, ENSG, Nancy

Abstract:

In this seminar, I will talk about the usage of elasticity properties to model the mechanical behaviour of the faults. I will present some preliminar results on simple synthetic models in order to integrate this method in efficient inverse approaches.

Speaker(s): Margaux Raguenel

Date: Friday 20th of April 2018

Location: room G201, ENSG, Nancy

Abstract:

Understanding the physical processes occurring in a geothermal reservoir is a key point to make decisions about resources exploitation developments. In the frame of the GEOTREF project in Basse-Terre, Guadeloupe, data have been acquired and interpreted by geologists and geophysicists. Numerical models are now build to assess geological scenarios in accordance with the obtained data and determine potential areas of interest. In this seminar, I will present my work on these numerical models. First, models have been designed to evaluate the impact of several parameters on heat transfers and fluid flows. These parameters have been incorporated in models to determine the realism of different geological scenarios explaining the presence of heat in Bouillante. To go further in the representation of complex geological and physical models, a tool linking two specialized libraries has then been designed and tested on several applications. The last part of this presentation will be a brainstorming on the potential use of this new tool and its application to the reservoir of Basse-Terre.

Speaker(s): Pierre Anquez

Date: Friday 23rd of February 2018

Location: room G201, ENSG, Nancy

Abstract:

Meshing a 3D geological model is often essential in integrative subsurface modeling, but it is often a time-consuming task that typically requires a lot of user interaction. The difficulty is double: (i) the invalidity of the models and (ii) their geometrical complexity. The principal cause of invalidity for 2D or 3D boundary models is the non-watertightness. However, watertightness is generally required by meshing methods. In addition, the inherent geometrical complexity of geological models (due to e.g. thin layers, unconformities, or small fault displacements) strongly constrains the quality of the mesh to generate. To have a good mesh quality, one solution is to modify the geological model by merging locally or displacing its boundaries before generating the mesh.
In this seminar I will present a method I am currently developing to detect and fix geological model invalid and complex features. I model these features by a graph providing a formal framework to operate and correct the input model. The possible operations to fix the geometrical and topological issues are equivalent to graph elementary operations. This seminar will also be an opportunity to present the GJK algorithm, a fast algorithm to compute convex shape intersection and distance, I intend to use in geomodel invalid feature detection process.