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Work plan brief presentation

Work plan brief presentation. Jose Jadsom S. de Figueiredo. Advisor. Co-advisor. Prof. Dr. Rodrigo Portugal. Prof. Dr. Jörg Schelicher. Collaborators. Estevan Esmi PhD Student in Applied Mathematics. Daniel Leal Macedo PhD Student in Geophysics. Lucas Freitas

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Work plan brief presentation

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  1. Work plan brief presentation Jose Jadsom S. de Figueiredo

  2. Advisor Co-advisor Prof. Dr. Rodrigo Portugal Prof. Dr. Jörg Schelicher Collaborators Estevan Esmi PhD Student in Applied Mathematics Daniel Leal Macedo PhD Student in Geophysics Lucas Freitas PhD Student in Computational Franscisco Oliveira PhD Student in Geophysics

  3. A little bit about my academic live UNICAMP

  4. Objectives of the my visit • To learning the seismic physical modeling and related aspects. • To study the behavior of cracks orientation relating with density of cracks and shape (if possible) and boundaries. • To realize experiments with models showing edge points. • Of course, other experiment that can be developed along with passage of time.

  5. Wave propagation Anisotropic and homogeneous medium • P - Wave and S-wave velocity changes according propagation direction. • S - Wave and is splitting in two another waves www.geo.brown.edu/People/Grads/abt/Tools/Seismology/splits%5B1%5D.gif Medium that have crack and fractured medium

  6. Why is important the mapping of cracks? http://en.wikipedia.org/wiki/File:Ductile_fracture_upd.png

  7. Motivation Hudson, 1981 Jamal M. Assad et. al., 1991 Jianxin Wei,2004 Thomsen’ s parameters

  8. About Models

  9. Different spatial dispositions of cracks Solid matrix of epoxy resin with inclusion of thin silicon rubber or Plexiglas with rubber Model 1 Model 2 Model 3

  10. Property of materials Plexiglas and Silicon Rubber are good candidates to model build. High contrast of velocity

  11. Model construction Some parameters to be observed and adjusted a Essential condition l b d Wave length c l > d and l > a b depends of density of cracks Epoxy resin + silicon rubber Transducer with central frequency Plexiglas Epoxy resin l = v/f = 2630000 mm/s l = v/f = 2745000 mm/s l = v/f = 1360000mm/s 300000 hz 300000 hz 300 Hhz 300000 hz = 8.76mm l l = 9.15 mm = 4.53 mm l l = v/f = 2745000 mm/s l l = v/f = 2630000 mm/s = v/f = 1360000 mm/s 500000 hz 500 Hhz 500000 hz 500000 hz l = 5.5 mm l = 5.26mm l = 2.72 mm

  12. Some references about rubber http://www.columbiaerd.com/orings.html

  13. Some questions to be answered • From the seismogram is it possible to know what is the crack´s orientation? • Or is other information(VSP, well logs etc) needed to determine the orientation of cracks? • Is there a right relation between cracks density and shear waves (faster and lower) in seismogram? • Is it possible from amplitude maps to delineate boundaries cracks volume in low and high density?

  14. References • Jamal M. Ass´ad, Robert H. Tatham and Jonh A. McDonald, 1991, A physical model study of microcrack-induced anisotropy, Geophysics ,57, Pag 1562. • Jianxin Wei,2004, A physical model study of diffrerent crack densities, J. Geophys. Eng., 70-76.

  15. Thank you for attention.

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