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 P. 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, 1^{st} 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, 06^{th} of June.

**Structural modelling uses sparse and ambiguous field observations to build a model of**

**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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A seminar by Margaux Raguenel at ENSG, Nancy.

On: Friday, 10^{th} of June.

This presentation will present a general overview of the design of experiments.

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A seminar by: Jonathan Edwards & Antoine Mazuyer at ENSG, Nancy

On: Friday, 27th of May

Summary: This presentation will give a quick overview of the topics presented during the 2nd Conference on Forward Modelling of Sedimentary Systems in Trondheim (Norway) in April 2016 and during the 7th International Symposium on In-Situ Rock Stress in Tampere (Finland) in May 2016.

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A seminar by Francois Bonneau at ENSG, Nancy.

On: Friday, 29^{th} of April.

This presentation will present a general overview of Big Data.

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