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Fiche de cours

Géophysique d'exploration régionale

Regional exploration geophysics

Faculté de gestion: Faculté des géosciences et de l'environnement (FGSE)

Responsable(s): Matteo Lupi, Andrea Moscariello, Beatriz Quintal
Intervenant(s): -

Période de validité: 2013 -> 2015

Pas d'horaire défini.

Cours-Exercices

Semestre d'automne
70 heures par semestre

Langue(s) d'enseignement: anglais
Public: Oui
Crédits: 0

Objectif

This course has the following objectives:

- To make the students familiar with geophysical inverse theory and its applicability for potential field (gravity, magnetics) and electromagnetic methods in an exploration context (oil, gas, water, heat);
- To make students familiar with main concepts in wave propagation and the reflection seismic method (data acquisition, processing and interpretation).

Contenu

- Introduction to geophysical inverse theory (the linear and non-linear problem, deterministic and stochastic approaches, model regularization, norms, image appraisal, etc.);
- Develop a basic linear inversion code using Matlab;
- Basic processing of potential field and electromagnetic data;
- Exercises on 2-D and 3-D inversion of potential field and electromagnetic data with application to exploration targets.
- Introduction to seismic methods (refraction and reflection seismic, impedance, intrinsic and extrinsic attenuation, seismic noise, vertical and horizontal resolution, etc.);
- Wave propagation in elastic media (stress-strain relation, elastic wave equation, P- and S-waves, diffraction, reflection and refraction);
- Rock properties (porosity, permeability, bulk and shear moduli, P- and S-wave velocities, velocity dispersion, intrinsic attenuation of seismic waves in fluid-saturated rocks, depth dependence of properties);
- Fundamentals of signal processing (Fourier transform, impulse response, linear systems, convolution, etc.);
- Reflection seismics: data acquisition (multiples, CDP, seismic sources, geophones and hydrophones, analogue signal conversion, representation of the seismic trace, seismic noise);
- Reflection seismics: data processing (static corrections, gain applications, filtering, deconvolution, velocity analysis, corrections, time-to-depth conversion, stacking, muting, migration);
- Reflection seismics: interpretation (cartography of reflectors, faults, folds, discordances, seismic modelling, 3D and 4D seismic).

Evaluation

Seminars, reports and exercises

Bibliographie

Blakey, R. J. (1996), Potential theory in gravity & magnetic applications, Cambridge University Press.
Menke, W. (1989), Geophysical data analysis: Discrete inverse theory, Academic Press.
Telford, W. M., L. P. Geldart, and R. E. Sheriff (1990), Applied geophysics, Cambridge University Press.
Yilmaz, O. (2001), Seismic data analysis: Processing, Inversion, and Interpretation of seismic data, vol. I & II, 2nd Ed., Society of Exploration Geophysics.

Exigences du cursus d'études

Géophysique d'exploration I & II (BSc) or Méthodes géophysiques de l'environnement I & II (BSc), or similar courses.

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