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SUMMARY:Compaction localization in geomaterials
DTSTART:20161007T121500
DTEND:20161007T131500
DTSTAMP:20260413T152906Z
UID:b686206ace452395d55257d22f6d95dbe0f7266eb9098ef9908cb4bb
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr Patrick Baud\, Laboratoire de Geophysique expériment
 ale\, Ecole et Observatoire des Sciences de la Terre (EOST)\, Strasbourg\,
  France\nThe development of deformation bands has primary importance on fl
 uid flow in subsurface geologic reservoirs and aquifers. Among diversity o
 f compactant failure modes in porous rock\, compaction bands are a type of
  deformation band characterized by a reduction in porosity and permeabilit
 y across the thin band structure. Mechanical data and microstructural obse
 rvations on sandstone demonstrate that compaction bands can develop in com
 positionally heterogeneous rock and are the dominant failure mode in the t
 ransitional regime from brittle faulting to cataclastic flow. Recent resul
 ts reveal that grain size distribution plays a fundamental role in compact
 ion band formation in this rock type. In the most homogeneous sandstones\,
  tabular continuous bands can efficiently impact fluid flow whereas local 
 heterogeneities make the bands more tortuous\, less continuous\, and in tu
 rn less efficient as permeability barrier. The stress states for compactio
 n band formation inferred in the field are significantly lower than those 
 measured in the laboratory data. We however show that compaction bands can
  develop under creep (constant stress) conditions over extended periods of
  time\, at stresses significantly lower than reported in previous studies 
 and hence closer to estimates based on field observations. Our creep data 
 show that significant time-dependent compaction can be expected in sandsto
 ne at stress conditions beyond the yield point. The three damage proxies r
 ecorded during our triaxial experiments show an obvious correlation\, sugg
 esting that the mechanism leading to this time-dependent compaction is str
 ess corrosion cracking.\n\nWhile convincing field observations of compacti
 on bands were presented in carbonate formations\, experimental studies gav
 e so far contrasted results\, suggesting that conditions for compaction ba
 nd development in limestone may be different than in sandstone. It has bee
 n noted that local heterogeneities\, material properties and geometric eff
 ects may favour or inhibit the formation of compaction bands in porous car
 bonates. Our recent results based on X-ray computed microtomography sugges
 t that the degree of cementation plays a fundamental role on the developme
 nt of compaction localization in carbonate formations.\n\nBio : Parick Bau
 d is currently Professor of Geophysics at EOST Strasbourg. He is in charge
  of the Rock Physics\, Petrophysics\, Hydrology\, borehole Geophysics and 
 Fracture & Fluid Mechanics courses. In 2008 he was invited professor at CO
 PPE/Universitade Federal of Rio de Janeiro. He got his PhD in 1995 for his
  thesis : "Theoretical and experimental study of crustal rock fracturing".
  His current researches are Rock Mechanics and Rock Physics with focus on 
 energy resources\, environmental applications and natural hazards. Study o
 f both the phenomenological and micromechanical aspects of rock deformatio
 n and fluid flow\, using an approach integrating high-pressure experiment\
 , characterization of microstructure and theoretical analysis.\nRecent top
 ics: Compaction bands in porous sandstone\, time-dependent deformation in 
 rocks\, p hysical properties and damage in volcanic rocks: implications fo
 r the dynamics on active volcanoes\, dilatancy\, compaction\, failure and 
 fluid flow in carbonate rocks X-ray Computed Microtomography.\n\n63 papers
 \, h index 26(SCOPUS)\nRECENT PUBLICATIONS\nZhu\, W.\, P. Baud\, S. Vincig
 uerra\, and T.-f. Wong\, Micromechanics of brittle faulting and cataclasti
 c flow in Mount Etna basalt\, J. Geophys. Res. Solid Earth\, 121\, doi:10.
 1002/2016JB012826\, 2016.\nBaud\, P.\, T. Reuschlé\, Y. Ji\, C. Cheung\, 
 and T.-f. Wong\, Mechanical compaction and strain localization in Bleurswi
 ller sandstone\, J. Geophys. Res. Solid Earth\, 120\, doi:10.1002/2015JB01
 2192\, 2015.\nHeap M.J.\, N. Brantut\, P. Baud\, and P.G. Meredith\, Time-
 dependent compaction band formation in sandstone. J. Geophys. Res.\, DOI: 
 10.1002/2015JB012022\, 2015.\nJi\, Y.\, S. Hall\, P. Baud\, and T.-f. Wong
 \, Characterization of pore structure and strain localization in Majella l
 imestone by X-ray computed tomography and digital image correlation\, Geop
 hys. J. Int.\, 200\, 701-719\, 2015.
LOCATION:GCA331 http://plan.epfl.ch/?lang=fr&room=GCA331
STATUS:CONFIRMED
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