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Two oil shales, an Eastern New Albany oil shale and a Western Green River oil shale, as well as the corresponding kerogens, were analyzed by using Curie-point low-voltage electron-ionization mass spectrometry. The experiments were designed in such a way as to enable separation of pyrolysis temperature and/or mineral matrix effects from the anticipated effect of differences in depositional environment. This experimental design, combined with the multivariate statistical analysis techniques used, shows that pyrolysis-temperature-related trends account for 36% of the total variance whereas the depositional trend (Green River vs. New Albany) explains 34%. Differences between the pyrolysis mass spectra of the oil shales and their corresponding kerogen isolates explained only 2% of the variance in the data. The high degree of similarity between the Curie-point pyrolyzates of the original oil shales and the pyrolyzates of the kerogen components was confirmed by combined gas chromatography/mass spectrometry. This indicates that (1) there is relatively little structural damage to the kerogens during the demineralization procedure and (2) representative pyrolysis mass spectra of kerogens appear to be obtainable by direct analysis of the neat oil shale samples.Contract No. DE-RQ21-85MC04047. The Western shale was obtained from Exxon Corp. and the Eastern shale from

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KZL = membrane thickness, cm SK/Li = ion selectivity = association constant shown by Eq. 2, cm3/mol Superscripts 1 = compartment I I1 = compartment I1

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