Computer Science
Scientific paper
Oct 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1115g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 10, pp.1115-1130
Computer Science
5
Scientific paper
The catalytic properties of clay surfaces have been investigated to determine the probable contribution of such reactions in petroleum genesis. Kinetic data were obtained for the evolution of hydrocarbons from the decomposition of organic compounds on mineral surfaces. These measurements may be extrapolated to lower temperatures to estimate the extent to which such reactions could proceed in sediments. Catalytic processes are expected to contribute to hydrocarbon formation since the surfaces of clays may strongly chemisorb organic material during mineral weathering in the biosphere. After subsequent deposition in sediments, the breakdown of surface-bonded carbonaceous material represents a source of hydrocarbons. From studies of the reactions of alcohols on montmorillonite and on ferric oxide, we conclude that: 1. (i) Surface reactions yielded n -, iso- and cyclo -alkanes, these hydrocarbons are abundant in petroleum 2. (ii) Yields were sufficiently large to account for the size of natural accumulations, 3. (iii) The rates of these reactions, at realistic source-rock temperatures, were sufficiently great to indicate that surface processes could significantly participate in the formation of hydrocarbons in nature. We conclude, therefore, that surface catalytic-type reactions provide a feasible route to petroleum genesis and that such reactions may make a substantial contribution tothe formation and diagenesis of natural hydrocarbon deposits.
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