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(Secretary of D2SET)
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PhD student in geophysics
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Project:
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Thesis
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Place:
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École des Mines de Paris
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Date:
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10/2000 - 10/2003
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Summary:
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During my PhD I work on a tomography (see previous projects)
method designed at the GEOPHY laboratory of the Ecole des
Mines de Paris (Paris School of Mines) and named Stereotomography.
Thanks to this method, a velocity model of the subsoil can be
built by using not only the seismic waves travel times but also
their emerging orientations (slopes). The use of the slopes gives
better constraint of the inversion process. The waves modelisation
is performed by using ray theory (high frequencies approximation).
The aim of my PhD is to use the method not only with surface seimic
data (obtained by marine acquisition campaign for example) but also
with wells data (surface to well or well to well seismic, depending
on the available data). The inverse problem becomes a multi-data one,
which will bring difficulties. The final purpose is to inverse
anisotropy (velocity depending on the orientation of rays).
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Project:
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Geophysics engineering
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Place:
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TOTALFINA Scientific Centre
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Date:
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09-1999 / 08-2000
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Summary:
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To build a velocity model (see below), tomography
computes synthetic traveltimes by ray-tracing in
a a-priori model. The difference between synthetic
and real (recorded during seismic acquisition)
traveltimes indicates how to change the model to
make it better. An iterative process provides a
final model, able to explain observed traveltimes.
Nowadays, geophysicists try to use compression
waves traveltimes and also shear waves traveltimes
which were previously neglected.
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Project:
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Engineer training period
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Place:
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TOTALFINA Scientific Centre
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Date:
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01-1999 / 08-1999
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Summary:
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Imaging is the last stage of seismic processing,
which allows a time to depth conversion. For that,
a subsoil velocity model is needed. Different ways
are used to build such a model. During this
training period, I worked on a very detailed
velocity analysis in order to improve imaging
quality.
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Project:
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Bac+5 training period
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Place:
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C.G.G. Processing Center, Massy
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Date:
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07-1998 / 12-1998
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Summary:
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The aim of seismic acquisition is to generate
compression waves on the ground and to record
reflections or refractions caused by the different
layers in the substratum. In the petroleum and
mining industry, large seismic campaigns are led in
order to discover oilfields and veins. These
campaigns generate a huge quantity of data which
must be processed (noises and multiple reflections
filtering, signal deconvolution, geometrical
effects correction...). These processings lead to a
structural image of the subsoil that geologists can
interpret.
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Project:
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Bac+4 training period
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Place:
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C.E.A. (French atomic energy agency),.Saclay
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Date:
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07-1997 / 09-1997
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Summary:
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During this trainig period, I coded a F77 binary
Cu-Pd alloy simulation using a Monte-Carlo method.
Firstly, the aim was to simulate an order/disorder
transition using the mean field approximation of
the atomic interaction. Secondly, the aim was to
simulate a simple step/double step transition on
sloped alloy's surface. such a transition had been
observed during X rays diffraction experiments.
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Project:
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Bac+3 numerical project
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Place:
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Paris VII University
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Date:
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Summary:
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When a compass is placed in an oscillating magnetic
field, his behaviour can become chaotic, depending
on the initial conditions. This numerical
simulation allowed us to display the strange
attractor of the system, to make Poincaré's slices
in it and to compute the Feigenbaum's constant.
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Adam GOSSELET
For printing.