Alton Brown's discussion implicitly addresses two different issues from Prinzhofer et al. (2000a) that we discuss separately in this article: (1) the physical possibility for natural gas, observed at present as a gas phase in sedimentary rocks to exhibit chemical and isotopic kinetic fractionation due to migration, and (2) the possibility for gas molecules, leaking from a reservoir through a seal as dissolved species, to form a gas phase above or in the seal.
The first point was the main issue of our previous article, and we shall demonstrate the importance of this process in sedimentary systems and how it...
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