Hydrogen isotope analysis of natural abundance and deuteriumenriched waters by reduction over chromium on-line to a dynamic dual inlet isotope-ratio mass spectrometer. Rapid Communications in Mass Spectrometry

The timing of oil charge into a trap is of interest to any
geologist trying to gain a thorough understanding of an asset
or prospect. However, the methods available are limited,
and the results sometimes ambiguous because there are no
direct methods of dating petroleum migration. Analysis of
diagenetic minerals can provide an indirect estimate of the
timing of reservoir filling: some reservoirs contain diagenetic
illite that can be dated using the K–Ar system. It has
been proposed that this illite grows at the time of oil filling
(Hamilton, Kelley, & Fallick, 1989) though the physical or
chemical mechanism remains obscure (Darby, Wilkinson,
Fallick, & Haszeldine, 1997; Wilkinson & Haszeldine,
2002). In recent years, basin models have become increasingly
popular as tools for the understanding of sedimentary
basins and their hydro-geological systems, but these must be
calibrated to field-specific measurements if their predictions