Mathematics – Logic
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..825d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 5, pp.825-833
Mathematics
Logic
1
Scientific paper
Acetate can mediate the primary migration of natural gas from tight, water-laden source rocks by acting as a mobile precursor that is expelled during compaction to resevoir rocks where subsequent decarboxylation yields methane. The viability of this mechanism is demonstrated by integrating, via a computer model, the experimental kinetic rate data for acetate decarboxylation that are presented in Part I with the thermal-temporal-spatial relationships of sediment and fluid in the upper portions of actively forming sedimentary basins. Specifically, this analysis indicates that when the enthalpy of activation is between 32 and 42 kcal · mol -1 , and the temperature is between 80 and 130°C, acetate can survive the thermal regime of a typical sedimentary basin long enough to migrate out of the source rocks and yet decarboxylate to form a natural gas deposit within the time frame imposed by the age of the basin sediments. The results suggest that this migration mechanism for natural gas may be predominant within a significant geological and chemical window. A similar analysis has shown that acetate can survive moderate hydrothermal temperatures (<300°C) long enough to promote the mobility of metals as acetate complexes. Ongoing experimental studies now show that metal-acetate complexes are stronger than the analogous chloro-complexes and may account for a large proportion of the metal in hydrothermal solutions with access to organic material.
Drummond S. E.
Palmer Donald A.
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