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.
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A seminar by: Thomas Driesner at ENSG, Nancy, room G201.
On: Thursady, 1st of September, 2:00 pm.
Summary:
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.
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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.
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A seminar by: Marion Parquer at ENSG, Nancy.
On: Wednesday, 26th of August.
Summary:
The optimal exploitation of a channelized reservoir necessitates the knowledge of the geological
heterogeneities impacting the flow circulation, such as shale drapes. It may be possible to observe
the most recent channel path and the abandoned meanders on seismic images, but smaller-scale
structures are generally below seismic resolution.
In this paper we propose to reconstruct channelized systems with a stochastic backward simulation of
the system. The method uses a correlation between the channel geometry and its natural migration.
Starting from the last stage of the sequence observed on reflection seismic data, the aim is to go back
in time until the early steps of evolution of the river. Clues about the palaeo-locations can be given by
the abandoned meanders. Thus, such objects are integrated step by step during the backward process.
The method has been applied on satellite images of fluvial systems. Each of the dierent resulting
geometries of the system honors most of the conditioning data and presents meandering patterns similar
to the observed ones.
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A seminar by : Thomas Jerome at ENSG, Nancy
On: Wednesday, 24th of August
Summary: Sciences can be tricky in the sense that there is often a gap between what practitioners have time to do in real projects and what they could accomplish if they were given the freedom to do what they want.
Geomodeling is no exception as will be shown in this presentation. Having now spent 9 years in Calgary, Thomas will give an overview of the oil patch in Calgary to focus on the place geomodeling has there.
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A seminar by: Benjamin Chauvin at ENSG, Nancy.
On: Friday, 22nd of July.
Summary: Mechanics-based restoration has been being used for the last 10 years and its advantages are valuable: recovery
of the paleo-geometries, deformation chronology, real 3D restoration, deformation mechanisms, oil maturation...
One of the main difficulties of this restoration method is the boundary condition setting. Even if some of them are
quite standard, there is no obvious set. In addition, recent works showed that the classical boundary conditions
used in mechanics-based restoration may have a lack of physical meaning [Lovely et al., 2012]. This seminar will
present a work on the restoration of an extensional analog model obtained in laboratory (data courtesy of C&C
Reservoirs and IFP). It corresponds to a sandbox model deformed using gravity. As the structural uncertainties are
very low and the forward deformation is known, my work consisted in restore this model and try to define and
validate the set of boundary conditions which may be applied on extensional models, in particular presenting a
basement of salt.
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A seminar by: Maxence Reberol (LORIA) at ENSG, Nancy.
On: Wednesday, 13th of July.
Summary: This talks will give insights on how to solve partial differential equations with the finite element method on hybrid non-conforming hexahedral-tetrahedral meshes. Some preliminary results obtained with low-order Lagrange finite elements will be presented. The talk will also discuss a method based on a computer graphics approach to measure distances between scalar field defined on distinct meshes. Such method allows to compare performances of different numerical methods on arbitrary meshes.
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A seminar by Modeste Irakarama at ENSG, Nancy.
On: Friday, 1st of July.
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A seminar by Gabriel Godefroy at ENSG, Nancy.
Stochastic fault simulation described as a constraint statisfaction problem: brainstorming
On: Friday, 06th of June.
subsurface geometries. Stochastic approaches sample uncertainties by producing a large
set of equiprobable models. Geological concepts are often used a posteriori to validate and
update the structural models. Instead of validating each realization, we want to define
and integrate constraints during the stochastic simulation. Each constraint may either
represent a geological concept or a field observation. We propose to formalize stochastic
structural modelling as Constraint Satisfaction Problem (CSP). In this paper, we propose
a fault network simulator relying on Constraint Solving methods. Fault geometries honor
given fault observations and size and orientation distributions. Fault network topology
and kinematic are constrained to avoid inconsistent fault branchings and unlikely fault
displacement maps.
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- Category: Seminar