Abstract
Measurements of the absorption coefficient of the band around 1710cm −1, combined with adequate chemical treatments, allow an evaluation of the importance of carbonyl, carboxylic acid and ester groups in various series of kerogens. The concentration of carbonyl and acid groups, the concentration of oxygenated functions other than carbonyl or carboxyl, and the total oxygen content are higher in shallow kerogens originating from higher plants than in those containing an important algal contribution; however the concentration of ester groups varies in the opposite direction. The carboxylic acid groups are the most sensitive to catagenetic evolution or pyrolysis. The carbonyl groups are removed progressively as evolution proceeds but a fraction of them is retained up to advanced degrees of evolution. Study of the band at 1630cm −1 has shown that, besides the bending vibration of molecular water, there is some contribution of bridged quinones and unsaturated hydrocarbons. However at least 50% of the absorption coefficient is due to polyaromatic structures. This band is generally much more intense for kerogens originating from higher plants.
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