Abstract
A pyrolysis—gas chromatographic system has been developed for rapid simultaneous analysis of C 8—C 15 free hydrocarbons and kerogen pyrolysates in small (25 mg) rock samples. The system combines thermal extraction and temperature-programmed furnace pyrolysis—gas chromatography using focussed cryogenic trapping on two capillary columns. The application of the method is demonstrated on two rock samples from an homogeneous sedimentary column. Gas chromatographic analysis of thermally and solvent-extracted material provides a complete chromatographic picture of the C 8—C 35 free hydrocarbons in the rock samples. Comparison of the furnace pyrolysis results with those obtained using a flash pyrolysis system shows that the two pyrolysis methods provide comparable data. The pyrolysates of isolated kerogen concentrates showed some differences compared with the whole-rock pyrolysis results suggesting that due to mineral matrix effects, interpretation of pyrolysis—gas chromatography data of kerogens in whole rocks is somewhat more difficult than with kerogen concentrates.
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