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  • Micro- and Nano-Raman Spectroscopy

    L. Borromeo1,2,*, U. Zimmermann1,2, S. And3, N. Egeland1,2, C. Toccafondi4, R. Ossikovski4, D. Bersani5, E. Garzanti3

    1 Department of Petroleum Engineering, University of Stavanger, Norway, laura.borromeo@uis.no2 The National IOR Centre of Norway, University of Stavanger, Norway

    3 Department of Earth and Environmental Sciences, University of Milano-Bicocca, Italy4LPICM, CNRS, Ecole Polytechnique, Universit Paris Saclay, France5 Department of Physics and Earth Sciences, University of Parma, Italy

    mailto:laura.borromeo@uis.no

  • Raman SpectroscopyRAMAN SPECTROSCOPY IS AN INNOVATIVE, EFFICIENT, USER-FRIENDLYTECHNIQUE, REPRESENTING A POWERFUL TOOL TO CONFIDENTLYIDENTIFY MINERALS

    Non destructive technique, quickness and microscopic resolution (1-2 m)

    No time-consuming

    No sample specific preparation (rocks, thin sections, micromounts, gas, liquid)IT CAN BE FRUITFULLY APPLIED TO MINERALOGY AND SEDIMENTARYPETROGRAPHY

    The InVia Micro-Raman spectrometer, Renishaw

    University of Milano Bicocca

  • Raman Spectra

    200

    Calcite crystal, Mexico

    Aragonitic Algae, Maldives

    Raman shift (cm-1)

    281

    714

    1088

    208 703

    1087

    707

    200 1000800600400

    RAMAN PEAK MINERAL

    Position Chemistry/structure

    WidthOrder-

    disorder/structure

    Intensity Quality/grainsize

    Relative intensity Orientation of the crystal

  • Micro-Raman on silt

    A new quantitative method to study silt-sizedgrains: light fraction of the Bengal shelf muds.

    Raman shift (cm-1)200 400 600 800 1000 1200 1400

    From L. Borromeo Master thesis

  • Micro - Raman on Flooded chalk

    Flooding with MgCl2 for c. 1.5 yearsat reservoir conditions (130C, 1PV/day, 12 MPa effective stress)

    Mineralogical changes due to fluidinjection: when Mg2+ ions bond with(CO3)2- ions: magnesite or Mg-calcite will grow as new mineralphases.

    Micro-Raman spectroscopy could identify the presence of magnesite along the core of the sample up to 4 cm from the injection surface.

    From Borromeo et al., in prep

  • +High-resolution

    Raman spectrometer

    Chemical and structural analysis

    Scanning probe microscope (SPM)

    Nano-resolvedsurface mapping

    TERS + AFM Nano-Raman

    Spatial resolution ~ 20 nm

    Raman signal

    enhancement ~ x104-5

    (Tip-Enhanced Raman Spectroscopy + Atomic Force Microscopy)

    TERS AFM Raman spectrometer, Horiba

    Ecole Polytechnique, Paris

  • Topography map

    Raman map: 4x4 m2, step = 250 nm For each pixel we acquired a TERS

    spectrum

    Tip-Enhanced Raman Spectroscopy measurements on chalk samples

    324 cm-1

    1096 cm-1

    TERS + AFM Nano-Raman

    Raman shift (cm-1)From Borromeo et al., in prep

    Magnesite

  • Conclusions Raman spectroscopy is a very efficient, user-friendly point-

    analysis technique that with a quick, non-destructive sample preparation allows us to obtain accurate minerochemicalinformation of micro- to nano-metric minerals.

    Raman spectroscopy provides an innovative work perspective in petroleum exploration of unconventional reservoirs, such chalk, siltstones and shales.

  • Grazie a tutti!

    For more information: And S. & Garzanti E. (2013). Raman Spectroscopy in heavy-mineral studies. Geological Society, London

    Special publications; And S.,Vignola P., Garzanti E., (2011). Raman counting: a new method to determine provenance of silt.

    Rendiconti Lincei, 22, Issue 4, 327-347; Borromeo L., U. Zimmermann, S. And, G. Coletti, D. Bersani, D. Basso, P. Gentile, B. Schulz, E.

    Garzanti. Raman Spectroscopy as a tool for magnesium estimation in Mg-calcite, submitted to JRS.

    C. V. Raman, 1928

    Micro- and Nano-Raman SpectroscopyRaman SpectroscopyRaman SpectraMicro-Raman on siltMicro - Raman on Flooded chalkSlide Number 6Slide Number 7Slide Number 8Grazie a tutti!

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