titolo

Avviso di Seminario - Prof. Nicola Tisato

target

totem,dipartimento,ppim

inizio

Martedì 05 Luglio 2016 ore 14:30

luogo

Aula ex bilbioteca - Dipartimento di Fisica e Geologia

relatore

Prof. Nicola Tisato

titoloevento

Seismic Wave Attenuation in saturated rocks: theory, laboratory and numerical experiments

abstract

Geophysical methods allow exploring the subsurface and rely on physical properties of
rocks. In the case of seismic tomography, which is the most utilized geophysical
method, the knowledge of rheology is pivotal to infer the structure and composition of
the Earth interior. Nonetheless, very often geophysicists treat geo-material as purely
elastic overlooking at the role of viscoelasticity in absorbing seismic energy. In the
present seminar I will introduce viscoelasticity in saturated rocks and how fluids can
produce frequency dependent attenuation and dispersion. Focusing on sandstones
saturated with different portions of gas and liquids, I will present laboratory experiments
performed to investigate wave-induced-fluid-flow and
wave-induced-gas-exsolution-dissolution processes and how these attenuation
mechanisms could be modelled and reveal details about the subsurface saturation. The
present work aims at improving the imaging of subsurface to reveal, for instance, the
formation of gas bubbles in volcanic or in oil and gas reservoirs.

organizzatori

Dott. Daniele Morgavi

docsrefs

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