Spectral signatures and optic coefficients of surface and reservoir rocks at COIL, CO2, and Nd:YAG laser wavelengths

Ramona M. Graves; El Tahir Bailo

doi:10.1117/12.524568

10 June 2004 Spectral signatures and optic coefficients of surface and reservoir rocks at COIL, CO₂, and Nd:YAG laser wavelengths

Ramona M. Graves, El Tahir Bailo

Author Affiliations +

Proceedings Volume 5273, Laser-Induced Damage in Optical Materials: 2003; (2004) https://doi.org/10.1117/12.524568
Event: XXXV Annual Symposium on Optical Materials for High Power Lasers: Boulder Damage Symposium, 2003, Boulder, Colorado, United States

Abstract

Approximately 40 different reservoir and surface rock samples were lased using high power COIL (λ = 1.315 μm), CO₂ (λ = 10.6 μm) and Nd:YAG (λ = 1.06 μm) lasers. Spectrum of the samples in the wavelength region from 0.35 to 15.387 μm was obtained. The objectives of this research are to make a detailed study of the spectral properties and optic signatures of rock samples, including reservoir rocks collected from a depth of more that 8,000 ft, in order to predict the energy absorbed when a laser hits a rock. The optical coefficients [extinction/reflection (E), scattering (S), absorption (K) and emission (F)] of these rocks are critically investigated against rock chemistry, grain size, mode of occurrence, porosity, cementing matrix and rock textures, and total organic content. This research, initiated for the petroleum industry, develops a relationship between reflectance and rock properties that are commonly known and used as correlation parameters for other reservoir characterization uses. Our results show that: (1) More than 25% of the COIL and Nd:YAG laser energy is reflected and/or scattered by rocks with more than 85% SiO₂ content. (2) Surface and reservoir sandstones have almost the same spectral features and hence similar optic coefficients. (3) Rocks with high porosity have greater reflection coefficients (at the COIL and Nd:YAG wavelengths) compared to those having lower porosity. (4) The reflectance at the CO₂ laser wavelength (10.6 μm) is not a function of porosity or grain size.

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Ramona M. Graves and El Tahir Bailo "Spectral signatures and optic coefficients of surface and reservoir rocks at COIL, CO₂, and Nd:YAG laser wavelengths", Proc. SPIE 5273, Laser-Induced Damage in Optical Materials: 2003, (10 June 2004); https://doi.org/10.1117/12.524568

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KEYWORDS

Absorption

Reflectivity

Carbon monoxide

Iron

Nd:YAG lasers

Silicates

Carbon

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