Abstract:
Trace metals in Yemen crude oils have been investigated;
The samples of Yemen crude oils were collected and
digested by a dry digestion method and analyzed by ICPOptical
emission Spectrometer technique and Universal of
petroleum (UOP-915-92) used to determine the distribution
of normal alkane and analyzed by gas chromatography
technique. The levels of most of the trace elements obtained
in this study were generally low. The relatively higher
levels of Ni in Malik, 32, 43 (3.942, 4.058, 4.005) and V
(4.919, 3.582, 3.633) respectively, Fe in Jannah, Alnaser
and Malik, 94.3, 92.7 and 33.45 respectively. Ni, V and Fe
observed in some results should be expected because these
metals are commonly associated with crude oil of Marine
organic materials with no signs of biodegradation. Carbon
preference index (CPI) of Yemen oils ranges between (1.04-
1.1) which indicate Yemen crude oil maturity. In this study,
the analysis of crude oils shows a slightly lower abundance
of C28 and C29 and relatively higher concentrations of C27
steranes indicate more input of marine organic source. In
this study is <2 (0.4037 - 1.6585) which indicates that the
Yemen crude oil was derived from marine sources with
increasing maturity. Ph/n-C18 (0.4484-0.4921) values less
than 1.0 are indicative of non-biodegraded; the decrease of
both Pr/n-C17 and Ph/n-C18 indicates maturation of the
Yemen crude oils. The V/Ni index decreases with the age of
oil so Yemen crude oils are young age because V/Ni less
than
