Abstract

Raman spectroscopy offers a non-destructive solution to characterize fluid inclusions. Detection of the chemical constituents of hydrocarbons in the hydrocarbon-bearing fluid inclusions in mineral cements, secondary fractures, and overgrowths could be a useful indicator of the source, quality, and maturity of oil in a basin. Microscope-based Raman spectroscopy is a non-destructive, optical vibrational spectroscopic technique that can precisely isolate and analyze hydrocarbon fluid inclusions (HCFIs). The main challenge with Raman spectral studies in natural HCFIs is the dominance of fluorescence emission from minerals and aromatic compounds in HCFIs leading to the masking of Raman signals. The use of laser excitation in 785nm (near IR) with suitable optics can provide better Raman signals from HCFIs and is reported for the first time. This chapter elaborates on how best the Raman signals from natural hydrocarbon bearing fluid inclusions could be detected using an excitation wavelength of 785nm with suitable optical parameters and with special wafer preparation techniques to negate the background fluorescence.

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