Evaluation of Yemen Crude Oil in Relation to its Maturity and heavy Metals Magnitude

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