In a deep core hole penetrating Paleocene-age strata on Spitsbergen Island, diffusive transport of light hydrocarbons from a siltstone into an adjacent sandstone unit is strongly supported by regular patterns of concentration changes which are controlled by molecular type, size, and structure. Individual molecular species are ranked in sequence of increasing effective diffusion coefficients. Benzene and toluene appear to have anomalously high transportation rates. These observations are significant with respect to an evaluation of the role of diffusion processes for hydrocarbon migration.

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