Direct determination of the aliphatic carbon content of individual macerals in petroleum source rocks by near-infrared microspectroscopy |
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| Authors: | AK Blob J Rullktter DH Welte |
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| Institution: | A.K. Blob, J. Rullkötter,D.H. Welte |
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| Abstract: | In order to determine the aliphatic carbon content in sedimentary organic particles near-infrared (NIR) microscope spectroscopy has been employed for the first time. An ordinary lens microscope photometer common for vitrinite reflectance measurements has been modified to detect hydrocarbon absorbance differences with a spatial resolution of about 30 μm.Microscopic studies of natural and artificial samples under reflected light condition were shown to be unsuitable for quantitative aliphatic C--- determination. Transmitted light measurements ofliptinites in polished thin sections, however, could be calibrated against synthetic polymer blends without exact knowledge of the sample thickness. In contrast to the established microscopic techniques for characterizing coal and petroleum source rocks NIR microspectroscopy is able to follow the chemical alterations of liptinites directly with comparatively low cost. |
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| Keywords: | aliphatic carbon content organic petrology microspectroscopy petroleum source rock near infrared chemical microscopy macerals liptinite tasmanales |
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