Abstract
A computer method is described for the automatic classification of triterpanes and steranes into gross structural type from their mass spectral characteristics. The method has been applied to the spectra obtained by GC-MS analysis of two mixtures of standards and of hydrocarbon fractions isolated from the Green River and Messel oil shales. Almost all of the steranes and triterpanes identified previously in both shales were classified, in addition to a number of new components. The results indicate that classification of such alkanes is possible with a laboratory computer system. The method has application to diagenesis and maturation studies, and to oil/oil and oil/source rock correlations, in which rapid screening of large numbers of samples is required.
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