Molecular parameters of maturation in the Toarcian shales, Paris Basin, France--I. Changes in the configurations of acyclic isoprenoid alkanes, steranes and triterpanes

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The changes in configuration at a number of chiral centres in certain acyclic isoprenoid alkanes, steranes, rearranged steranes and triterpanes of the hopane type in a suite of fourteen Toarcian shales (Paris Basin) have been determined by gas chromatography and combined gas chromatography-mass spectrometry. A sequence of changes in the ratios of various stereoisomers occurs both with increasing maximum depth of burial and in a North-South direction for shallow samples (maximum burial depth < 1000m). These changes cover the full range of maturity shown by the samples. The presence of 5 (H), 14 (H), 17 (H)-steranes in immature samples indicates the presence of a reworked component. The extent of epimerisation at a number of the chiral centres suggests that it relates to the extent of steric hindrance at the centres.

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