Mathematics – Logic
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..473s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Issue 5, pp.473-484
Mathematics
Logic
3
Scientific paper
Comparison of biological marker alkanes in the kerogen pyrolyzate and bitumen from a sediment is a useful test for the indigenous nature of sediment extracts. For the pyrolysis conditions used, the bulk of the hydrocarbons is released from the kerogen matrix between 375° and 550°C; and its steriochemistry is almost the same as that observed in the extractable bitumen in a genuine source rock. Examples are given to demonstrate that, during pyrolysis, the sterane/terpane ratio decreases and secondary terpanes are generated at the expense of primary ones. The mechanism of artificial petroleum generation by pyrolysis differs from `natural' diagenesis during geological time and is reflected in the composition of certain C 27 -C 29 steranes, as demonstrated by simulation experiments and C 29 -C 30 moretanes and hopanes. The 5 /5 -sterane ratios, jointly with 17 ( H )- hopane /17 ( H )- moretane ratios, tricyclic terpane concentrations and 17 ( H )/17 ( H )-trisnorhopane ratios, allow the differentiation of kerogens from adjacent stratigraphies.
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