Micro- and Nano-Raman Spectroscopy - UiS 2016 Borromeo_SALB.pdf · Micro- and Nano-Raman Spectroscopy…

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Micro- and Nano-Raman SpectroscopyL. Borromeo1,2,*, U. Zimmermann1,2, S. And3, N. Egeland1,2, C. Toccafondi4, R. Ossikovski4, D. Bersani5, E. Garzanti31 Department of Petroleum Engineering, University of Stavanger, Norway, laura.borromeo@uis.no2 The National IOR Centre of Norway, University of Stavanger, Norway3 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, Italymailto:laura.borromeo@uis.noRaman 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 SEDIMENTARYPETROGRAPHYThe InVia Micro-Raman spectrometer, RenishawUniversity of Milano BicoccaRaman Spectra200Calcite crystal, MexicoAragonitic Algae, MaldivesRaman shift (cm-1)2817141088208 7031087707200 1000800600400RAMAN PEAK MINERALPosition Chemistry/structureWidthOrder-disorder/structureIntensity Quality/grainsizeRelative intensity Orientation of the crystalMicro-Raman on siltA new quantitative method to study silt-sizedgrains: light fraction of the Bengal shelf muds.Raman shift (cm-1)200 400 600 800 1000 1200 1400From L. Borromeo Master thesisMicro - 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-resolutionRaman spectrometerChemical and structural analysisScanning probe microscope (SPM)Nano-resolvedsurface mappingTERS + AFM Nano-Raman Spatial resolution ~ 20 nm Raman signal enhancement ~ x104-5(Tip-Enhanced Raman Spectroscopy + Atomic Force Microscopy) TERS AFM Raman spectrometer, HoribaEcole Polytechnique, ParisTopography map Raman map: 4x4 m2, step = 250 nm For each pixel we acquired a TERS spectrumTip-Enhanced Raman Spectroscopy measurements on chalk samples 324 cm-11096 cm-1TERS + AFM Nano-RamanRaman shift (cm-1)From Borromeo et al., in prepMagnesiteConclusions 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, LondonSpecial 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, 1928Micro- and Nano-Raman SpectroscopyRaman SpectroscopyRaman SpectraMicro-Raman on siltMicro - Raman on Flooded chalkSlide Number 6Slide Number 7Slide Number 8Grazie a tutti!