Prinzhofer et al. (2000) propose that light hydrocarbons in conventional gas accumulations dissolve in pore water, diffuse (and fractionate) as dissolved species through seals, and form a gas within and above seals. The gas exsolved in the seal can then migrate to conventional accumulations, where gas migration history can be interpreted from its geochemical characteristics.
I agree with Prinzhofer et al. (2000) that dissolved light hydrocarbons kinetically fractionate as they diffuse, but I disagree with the assertion that a gas is likely to form in or above a seal after diffusion. Although this may seem to be a minor objection...
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