Changes

In '''dating the formation of the reservoir, seal, and trap''', the age of an accumulation can be no older than the age of the reservoir, seal, or trapping geometry. For example, offshore Gulf of Mexico accumulations in Pleistocene reservoirs can be no older than the Pleistocene.

In '''dating the formation of the reservoir, seal, and trap''', the age of an accumulation can be no older than the age of the reservoir, seal, or trapping geometry. For example, offshore Gulf of Mexico accumulations in Pleistocene reservoirs can be no older than the Pleistocene.

'''Direct radiometric measurements''' are difficult to perform because most reservoirs do not have datable material that formed during charging. The Groningen gas field (Permian, the Netherlands) has been dated as pre-Late Jurassic by the retardation effect of gas on radiometrically datable illite cements in the reservoir.<ref name=ch11r22>Lee, M., Aronson, J., L., Savin, S., M., 1985, K/Ar dating of time of gas emplacement in Rotliegendes sandstone, Netherlands: AAPG Bulletin, vol. 69, p. 1381–1385.</ref>

'''Direct radiometric measurements''' are difficult to perform because most reservoirs do not have datable material that formed during charging. The Groningen gas field (Permian, the Netherlands) has been dated as pre-Late Jurassic by the retardation effect of gas on radiometrically datable illite cements in the reservoir.<ref name=ch11r22>Lee, M., Aronson, J., L., Savin, S., M., 1985, [http://archives.datapages.com/data/bulletns/1984-85/data/pg/0069/0009/1350/1381.htm K/Ar dating of time of gas emplacement in Rotliegendes sandstone, Netherlands]: AAPG Bulletin, vol. 69, p. 1381–1385.</ref>

==References==

==References==